UCAS-D/ N-UCAS concept
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The idea of UAVs with full stealth and combat capabilities has come a long way, quickly. Air forces around the world are pursuing R&D programs, but in the USA, progress is being led by the US Navy.
Their interest is well-founded. A May 2007 non-partisan report discussed the lengthening reach of ship-killers. Meanwhile, the US Navy’s carrier fleet sees its strike range shrinking to 1950s distances, and prepares for a future with fewer carrier air wings than operational carriers. Could UCAV/UCAS vehicles with longer ranges, and indefinite flight time limits via aerial refueling, solve these problems? Some people in the Navy seem to think that they might. Hence UCAS-D/ N-UCAS, which received a major push in the FY 2010 defense review. Now, Northrop Grumman is improving its X-47 UCAS-D under contract, even as emerging privately-developed options expand the Navy’s future choices as it works on its new RFP.
N-UCAS: Programs & Potential
X-47B concept
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In early 2006 the future of DARPA’s J-UCAS program seemed uncertain. It aimed to create Unmanned Combat Aerial Vehicles (UCAV) for the USAF and Navy that could approach the capabilities of an F-117 stealth fighter. Boeing’s X-45C was set to face off against Northrop Grumman’s X-47B Pegasus, the program had demonstrated successful tests that included dropping bombs, and aerial refueling tests were envisioned. J-UCAS was eventually canceled when the services failed to take it up, but the technologies have survived, and the US Navy remained interested.
N-UCAS (Naval Unmanned Combat Air System) is the US Navy’s broader umbrella initiative to define/develop/produce a fleet of unmanned, carrier based strike and surveillance aircraft. The UCAS-D demonstration program is a subset of that initiative. If the demonstrations go well, the Navy may progress to an Unmanned Carrier-Launched Airborne Surveillance and Strike (UCLASS) program.
In July 2007, Northrop Grumman’s X-47B Pegasus beat Boeing’s X-45C to win the UCAS-D development contract. Northrop Grumman’s Aug 3/07 release describes their mission as:
“The UCAS-D effort will mature critical technologies, reduce unmanned air system carrier integration risks and provide information necessary to support a potential follow-on acquisition milestone.”
Translation: show us that this can work, and demonstrate carrier-based launches and recoveries of a tailless, autonomous, “LO-relevant” aircraft. “Low Observable relevant” means that its outer shape must reflect stealth requirements, but without any of the operational stealth coatings and other expensive measures. That makes sense, since UCAS-D is only about aerodynamics and control. Eventually, follow on programs like N-UCAS will have to test stealth as well, but UCAS-D will be about the basics.
Right now, there are 2 big technical challenges for UCAS-D. One is safe, reliable flight and landings in carrier-controlled airspace, for a stealth aircraft that may not always be visible on radar. The other big challenge is successful and safe aerial refueling.
Like the F-117, a UCAV’s self-defense would involve remaining undetected. While UCAVs can theoretically be built to execute maneuvers no human pilot could handle, the pilot’s awareness of surrounding events would be quite limited. The X-47B isn’t being designed to do what the type inherently does poorly, but to do what the type does inherently well: be stealthier than manned aircraft, and fly reliably on station for days using aerial refueling support.
If Northrop Grumman or emerging competitors can overcome those challenges, and if UCAV reliability lets them match the 2-3 day long mission profiles of Northrop Grumman’s RQ-4 Global Hawks, the US Navy would receive the equivalent of a carrier-borne F-117 stealth fighter, with improved stealth and no pilot fatigue limits. That would open up entirely new possibilities for American carriers.
If aerial refueling support is present behind the front lines, an N-UCAS wing could easily sally forth to hit targets thousands miles from their host carrier, while pilots inside the ship fly in shifts. The X-47s would fly a much shorter distance back to aerial tankers as needed, and only return to the steaming carrier several days later, or when their weapons had been used up. As a concrete example, in an emergency a carrier could launch UCAVs as it left Gibraltar at the gate of the Mediterranean, then fly them to the Persian Gulf and keep them on patrol using USAF aerial refueling tankers, all the while steaming to catch up. As the carrier got closer to the Arabian Sea off of Oman, the UCAVs would get more and more loiter time over their target area, and the “chainsaw” would get shorter and shorter.
Next Step: UCLASS
Concept no more
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The USA’s Naval Aviation Master Plan currently includes provisions for a Navy UCAS (N-UCAS) around 2025. If UCAS-D work goes very well, and the US Navy follows through on its shift toward an X-47B-class UCAV that can be used for limited missions, pressure will build for much earlier deployment. There are already indications of pressure along those lines, and the UCLASS RFI sets a goal of fielding a limited capability UCAV on board American carriers by 2018 or so. Barring continued and substantial pressure from above, however, the level of cultural shift required by the naval aviation community is likely to slow down any deployment of advanced UCAVs on board ships.
If and when the US Navy proceeds with a full Unmanned Combat Air Vehicle deployment program, the X-47 will have competitors.
Predator C
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General Atomics was first out of the gate, expanding its jet-powered Predator C “Avenger” research program to include a carrier-capable “Sea Avenger” as well.
Boeing is another clear competitor, who makes F/A-18 Super Hornet naval fighters, and has the privately-developed X-45 Phantom Ray. The Phantom Ray was developed under the earlier DARPA J-UCAS effort, and Boeing joins Northrop Grumman, General Atomics, and Lockheed Martin as recipients of the Navy’s next-stage UCLASS study contracts.
Lockheed UCLASS
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Lockheed Martin’s concept comes out of their famed Skunk Works facility, and builds on internal efforts like Polecat and classified programs like the RQ-170. They also seem to be making a push to leverage their strength in back-end command and control systems as a selling point, while partnering with control system specialist DreamHammer.
Beyond Boeing, Britain’s BAE Taranis and Europe’s Dassault-led nEUROn program have excluded carrier operations from their programs, but France has a full-size aircraft carrier, and Britain expects to join her by 2020. Once the initial demonstration phases are done, European work on carrier-related UCAV R&D becomes a distinct possibility.
Northrop Grumman’s UCAS-D team hopes that by completing the UCAS-D funded demonstration phase, they’ll be able to offer an inherently conservative service a proven UCAV option, with a more complete set of advanced capabilities than privately-developed or late-moving competitors.
UCAS-D: Program & Team
The first X-47B Pegasus UCAS-D (AV-1) was scheduled to fly in December 2009, but that was pushed back to Q1 of CY 2010, and finally ended up taking place in February 2011. It conducted series of detailed flight envelope and land-based carrier integration and qualification events at Edwards AFB, CA, then returned to NAS Patuxent River, MD to begin land-based carrier landing trials.
AV-2, which is equipped with full refueling systems, was expected to make its first flight in November 2010, and begin testing autonomous aerial refueling (AAR). Early 2011 saw the AV-2 airframe pass static and dynamic load tests, but AV-2′s flights were delayed until AV-1 finishes its own tests, in late 2011, and didn’t take off until November 2011. It began carrier-related testing in 2012, and launched for the 1st time in May 2013. Full launch and landing circuits, and aerial refueling tests, are still on the horizon.
Its first landing was initially set for late 2011, but the firm now talks about some time in 2013. Once autonomous aerial refueling demonstrations begin, the Navy intends to achieve both probe & drogue (USN style) and boom/receptacle (USAF style) refuelings.
Northrop Grumman’s facility in Palmdale, CA is the final assembly site for the X-47B, and the industrial team also includes:
UCAS-D: Northrop Grumman’s X-47B
X-47B 3-view
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UCAVs currently have no real situational awareness of the airspace around them, which makes them sitting ducks for any attack that doesn’t use radar guidance, and isn’t picked up by their radar warning receivers. Even an alerted UCAV currently has few options but to try and change course. That may work against ground threats, but mobile aerial opponents will simply follow and kill them. Their best defense is not to be found. Their best option if found is to make it hard to keep a radar track on them, or to vector in enemy aircraft. This may be why high-end strike UCAVs like the Boeing X-45 Phantom Ray, European nEUROn, British Taranis, and Russian MiG SKAT all use the maximum stealth configuration of tailless subsonic blended wing bodies with shielded air intakes, and attenuated exhausts.
The X-47B’s modified flying wing design and top-mounted air intake reflect this orientation. By removing the pilot and opting for sub-sonic speeds, Northrop Grumman is able to field a design that looks like a more advanced version of its B-2 bomber. Instead of a straight flying wing like Boeing’s competing X-45C, however, their engineers opted for a cranked wing that improves landing characteristics on carrier decks, and makes it easy to use carrier-borne aircrafts’ classic “folding wing” design for improved storage in tight spaces.
This UCAV may be a short plane, but it’s not a small one. The X-47B’s 62.1 foot wingspan rivals the Navy’s old F-14s, and is wider than a Navy F/A-18 Hornet or even a larger Super Hornet. Because of its foreshortened length, however, its storage “spot factor” relative to an F/A-18C Hornet (“1.0″) is just 0.87.
Target and strike
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Pratt & Whitney Canada JT15D-5C turbofan engine powered previous X-47 models, but the UCAS-D will adopt Pratt & Whitney’s F100-PW-220U, a modified variant of the engine that powers American F-16 and F-15 fighters. Subsonic requirements and carrier-based employment changed the engine’s imperatives: it will produce less thrust than its F100 counterparts (just 16,000 pounds), in exchange for efficiency improvements and better protection against the corrosive salt-water environment.
Efficiency matters to this platform. Unrefueled X-47B range is expected to be between 1,500 – 2,100 nautical miles, with a maximum payload of 4,500 pounds. The standard payload is expected to be a pair of 2,000 pound JDAMs, but the weapon bay’s ultimate size and shape will determine its ability to carry other options like strike missiles, JSOW glide bombs, a pair of 4-bomb racks for the GPS-guided Small Diameter Bomb, the forthcoming Joint Air-Ground Missile, etc.
Sensors are currently to be determined, as they aren’t really the point of UCAS-D. Any Navy strike platform is expected to have an advanced SAR radar with Ground Moving Target Indicator (SAR/GMTI), conformal electro-optic day/night cameras, and ESM (Electronic Support Measures) equipment that helps it pinpoint and trace back incoming electromagnetic signals. Given the X-47B’s design’s inherent strengths of stealth and long endurance, additional modules or payloads for tasks like signals collection must surely be expected.
Naval UCAVs: Contracts and Key Events
See also “Boeing to Advance UAV Aerial Refueling” for background and updates regarding unmanned aerial refueling test programs in the US military – which now include UCAS-D/ N-UCAS.
Unless otherwise indicated, The Naval Air Systems Command Patuxent River, MD manages these contracts.
FY 2014
X-47B UCAS-D
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April 10/14: UCAS-D Testing. The X-47B conducts its 1st night flight. Sources: US NAVAIR, “Photo Release: X-47B completes night flights”.
April 10/14: UCLASS GA. General Atomics’ modified Sea Avenger UAV appears to have grown larger since initial designs were released, with an internal bay and 4 wing hardpoints, including an option for buddy refueling tanks. The key question for the company will be the UCLASS stealth requirements. If they’re focused on ISR and strike missions in defended airspace, requiring good stealth scores in the C, X, and Ku bands, the Sea Avenger probably can’t compete. If the requirements focus on missions in relatively unthreatened airspace, inherent efficiencies in the the Sea Avenger’s design sharply improve its chances. Sources: USNI, “General Atomics Shows Off Company’s UCLASS Option”.
April 9/14: UCAS-D Recognition. The X-47B program is awarded the aerospace industry’s annual Robert Collier trophy for 2013. Sources: US NAVAIR, “Navy’s X-47B program receives aviation honor”.
April 8/14: UCLASS. Speaking at the Sea, Air and Space 2014 expo, NAVAIR PEO unmanned aviation and strike weapons Adm. Mat Winter says that the US Navy expects to release a classified UCLASS draft RFP before the end of April. Sources: USNI, “Classified UCLASS Draft Request for Proposal Due at End of April”.
Feb 13 – April 2/14: UCLASS. Nailing down the UCLASS requirements has been the Navy’s biggest headache throughout, and even at this late date, competing visions are still problematic enough to delay the RFP. One is remidned of legendary Skunk Works chief Kelly Johnson:
“Starve before doing business with the damned Navy. They don’t know what the hell they want and will drive you up a wall before they break either your heart or a more exposed part of your anatomy.”
The core design issues are straightforward. One, more payload = more size = more cost. Two, different UCAV sizes force a choice of specific marinized jet engines, which will have specific fuel consumptions. If gal/nmi isn’t good enough, that means more fuel, which means more payload, and see #1. Engine choice also affects stealth and size directly, since efficient high-bypass turbofans have large diameters, and you have to design around that. Finally, stealth itself costs money, and creates airframe designs that are difficult to change later.
The Navy’s requirements (q.v. June 26/13) effectively impose a $75 million per UCAV cost cap, but “we want it all” letters from House ASC Seapower subcommittee chair Randy Forbes are likely to force costs to $100+ million if its recommendations are adopted. Wanting in-air refueling capability is critical for any UCAV, but adding maximum stealth and payload to the request is what breaks the deal. This may be one of those cases where a limited program with a less expensive platform is what’s really called for, in order to allow the Navy to figure out how they can best use the technology first. Sources: Scribd, Rep. Randy Forbes UCLASS Letter || USNI, “Cost Will Drive UCLASS Designs” | “Requirements Debate Continues to Delay UCLASS RFP”.
April 1/14: UCLASS. The Navy has been discussing the potential use of UCLASS as an aerial tanker platform for some time now. They aren’t talking about forward use during strikes. Rather, they’re focused on orbits around the carrier that can top off planes in the landing circle.
The Navy currently uses F/A-18E/F Super Hornets for that job, configured with buddy refueling tanks. Those missions eat up fully 20% of the fighters’ missions, consuming limited airframe flight hours for an expensive asset. All because the Navy foolishly retired its S-3 Vikings when they still had more remaining airframe life than a new Super Hornet. The coming COD carrier cargo aircraft competition may provide a different solution to this problem, via an upgraded C-3 Viking or the V-22′s roll-on refueling pallet. That’s good, because there probably won’t be enough UCLASS drones to do this job and perform their own missions. Sources: USNI, “UCLASS Could Be Used as Tanker for Carrier Air Wing”.
March 31/14: GAO Report. The US GAO tables its “Assessments of Selected Weapon Programs“. Which is actually a review for 2013, plus time to compile and publish. They peg the UCLASS program at $3.7 billion, and express concern about using a “technology development” program as a procurement program, which would bypass formal systems development requirements and move directly into production in 2020. A development contract is expected in FY 2014, but:
“UCLASS is critically dependent on the development and fielding of the Joint Precision Approach and Landing System (JPALS), a global positioning system that guides aircraft onto an aircraft carrier. Navy officials expect UCLASS to hold a preliminary design review – including the air vehicle, carrier, and control segments – in May 2014 based on JPALS test progress. However, the Navy still considers JPALS one of its top risks for UCLASS.”
March 4-11/14: FY15 Budget. The US military slowly files its budget documents, detailing planned spending from FY 2014 – 2019. The future UCLASS program is slated to consume $2.937 billion through FY 2019, all of which will be R&D money due to the program’s structure.
Feb 13/14: UCLASS Air-to-Air? The Navy is thinking broadly about UCLASS, which is good as long as it doesn’t screw up the specifications. Director of air warfare Rear Adm. Mike Manazir talks about the potential to use the UCLASS’ payload bay as a missile magazine. It wouldn’t have independent targeting capability, but datalinks with fighters like the missile-limited F-35C would allow remote firing, with guidance provided thereafter by manned fighters.
It’s the right kind of thinking, but unlikely to see much use for 3 reasons. One is that the UCLASS will be subsonic, with very limited ability to avoid enemy fighters. That’s a nice way of saying that they’d be expensive sitting ducks if enemy aircraft can get a firing solution on them, even as the number of missiles on board makes them a priority target. Another potential issue is that asking internal launchers to handle a wider variety of weapons (q.v. Nov 21/13) generally drives up costs, and may compromise optimal weapon configurations for the strike role. On a less likely but more catastrophic level, one hopes there’s no software exploit that might allow others to issue those kinds of firing commands. Sources: USNI, “Navy’s UCLASS Could Be Air to Air Fighter”.
Feb 4/14: UCLASS. The FY 2014 defense budget bill added some new demands on the UCLASS program, but they won’t stop the Navy from running it as a technology demonstration project that goes straight into operational production.
Programmatic updates, and annual GAO review of the program, are normal. What will change is the number of UAVs bought during the TD Phase, which is capped at 6 instead of the planned 24. The Navy says that they can handle Milestone B approval with 6, which was never really in doubt. What does change is the ability to field what’s effectively an operational capability straight out of the TD phase. Sources: USNI, “Navy: Congressional Oversight Will Not Slow UCLASS Program”.
Nov 21/13: UCLASS. The UCLASS weapons debate isn’t solved yet, though the Navy seems to be leaning strongly toward a primary surveillance and targeting role, since that would be a new addition to the carrier air wing. UCLASS/UCAS-D requirements officer Cmdr. Pete Yelle says that:
“Weapons requirements will be defined in the final proposals. It is up to the vendors to come back with proposals and leverage what is available”…. The UCLASS will be able to work operations over land and water using EO/IR, or electro-optical/infrared sensors, FMV or full-motion video and eventually a fifth-generation AESA radar, Yelle said.”
Full Motion Video is part of most EO/IR systems these days. As for the AESA radar, that can mean a wide array of solutions, and a significant range of expense. The question is how far one wants to go. Just surface scans? Surface scans plus periscope detection capabilities, to partially replace the retired S-3 Viking’s role? Or a full fighter radar for air and ground surveillance, with specialized capabilities added as software? Each choice leads to different cost ranges, and potential commonalities or divergences with other fleet assets.
On the weapons front, some capability for persistent surveillance and strike seems like an obvious addition. What’s available includes Paveway laser-guidance, JDAM and Small Diameter Bomb GPS, and DAMTC dual-mode laser/GPS bombs. Depending on a given UAV’s internal mechanics, compact anti-ship missiles and even AIM-9X air defense weapons could also become an option, but that tends to add complexity and cost to the system. Sources: Defense Tech, “Navy Plans to Arm UCLASS with JDAMs”.
Nov 10/13: Flying again. The X-47B is back at sea, flying from the decks of the USS Theodore Roosevelt [CVN 71]. US Navy, “X-47B Operates Aboard Theodore Roosevelt”:
“The aircraft performed precise touch and go maneuvers on the ship to generate data that characterizes the environment in close proximity of the carrier flight deck. In addition, the aircraft took part in flight deck handling drills, completed arrested landings and catapult launches. Mission operators monitored the aircraft’s autonomous flight from a portable command and control unit from Theodore Roosevelt’s flight deck during each of its 45-minute flights.”
FY 2013
In-depth carrier ops testing; UCAS-D deck handling, catapult launch, and arrested landing tests; Despite cuts, UCLASS plans are still on.
History made
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Aug 28 – Sept 6/13: AAR. A Calspan Learjet has been modified with a non-functioning aerial refueling probe, and X-47B UCAV hardware and software for navigation, command and control, and vision processing. Its challenge? To fly behind an Omega K-707 tanker, and demonstrate its ability to hold correct positions and operate with the installed systems. Testing went well.
The next step will using the kind of digital messaging and navigation processes that were demonstrated by the UCAV’s recent carrier landings, with Rockwell Collins TTNT datalink, and Precision Relative GPS (PGPS) algorithms. The final goal? A complete autonomous rendezvous, approach, plug, and safe separation. No fuel will be transferred to the Learjet, which isn’t equipped to receive it anyway, but the ability to fly that kind of evolution is enough challenge all by itself. People in the military overuse the phrase “game changer,” but a technology that could allow continuous 72+ hour missions and trans-ocean control from a carrier would indeed justify that description. Sources: US NAVAIR, “Navy autonomous aerial refueling tests underway”.
Aug 14/13: UCLASS. US Naval Air Systems Command in Patuxent River, MD offers each of the UCLASS study participants another $15 million firm-fixed-price contract for their preliminary design review assessment work. Each firm has $4.75 million committed to it immediately, and work is extended until June 2014. Too bad the core requirements are still in flux. The winners include:
Northrop Grumman Systems Corp. in El Segundo, CA (N00019-13-C-0140).
Lockheed Martin Corp. in Palmdale, CA (N00019-13-C-0141).
Boeing in St. Louis, MO (N00019-13-C-0142).
General Atomics Aeronautical Systems, Inc. in Poway, CA (N00019-13-C-0143).
Aug 12/13: UCLASS. Aviation Week reports that the US Navy is having a hard time with the specifications for their UCLASS program RFP, which will be delayed into September 2013.
The biggest question is how much stealth the drone requires. Despite recent manufacturing advances, like the radar-absorbing materials baked right into the F-35′s composite skin, more stealth tends to make planes more expensive to buy and to maintain, while dropping their endurance and payload. On the other hand, current drones would have a very short life expectancy against advanced air defense systems, which creates a gap outside of the military’s unknown “black” programs.
Aviation Week reports that Northrop Grumman and Lockheed Martin are emphasizing stealth, while General Atomics and Boeing are willing to raise the radar cross-section somewhat in exchange for payload and endurance. General Atomics’ Sea Avenger, with its winged body and tail, does seem to fit this description. On the other hand, Boeing’s X-45 Phantom Ray is a tailless flying wing design, just like its NGC and Lockheed competitors. If Boeing is really prioritizing range and payload, it means they’re changing their base platform. Aviation Week: “Uclass: How Much LO is Enough?”
Aug 7/13: UCAS-D: Keep flying. It seems that the X-47Bs aren’t done flying yet. Instead of mothballing them as planned, the US Navy wants to keep them flying into 2015, and deploy to carriers 3 more times. Up to 3 more carriers will be fitted with compatible equipment, and Congress may get its wish to have the aerial refueling tests restored and completed by October 2014. The most important test will involve full integration with a 70-plane carrier air wing for several weeks, which would create a different level of comfort within the Navy for unmanned aircraft.
Despite past weapon drops under the J-UCAS program, The Us Navy doesn’t expect to conduct any of those with the X-47 UCAS-D. NAVAIR’s Capt. Jaime Engdahl repeated that refusal a couple of times a week later, at the AUVSI conference.
Continued flying will also give Northrop Grumman additional opportunities to work on its UCLASS design, and ensure that the Navy gets comfortable with its evolution. David Axe correctly points out that the last situation similar to this one involve Lockheed Martin’s X-35 design, which was chosen to become the F-35. DoD Buzz: “Navy: X-47B Drone Won’t Be a Killer” | USNI News: “NAVAIR: X-47B to Fly Again” | War Is Boring: “Navy’s Big Surprise: Carrier Drone to Make a Comeback”.
July 10/13: X-47B “Salty Dog 502″ leaves NAS Pax River, MD and flies to USS George H.W. Bush [CVN 77], off the coast of Virginia. The UCAV successfully lands on the aircraft carrier and traps the #3 wire, marking a huge milestone in naval aviation. It then takes off from the carrier and lands again. On the 3rd approach, the drone reported that one of its 3 navigational computers failed. Rear Adm. Mat Winter decides that they had done enough for 1 day, and orders the drone back to Wallops Island, VA to land. Even with that minor glitch, the Secretary of the Navy had an appropriate quote when he said that:
“It isn’t very often you get a glimpse of the future. Today, those of us aboard USS George H.W. Bush got that chance…”
Actually, glimpses of the future are common. What he meant to say was that glimpses of a future that promises big changes in naval warfare are rare. This event is indeed in that class – closer to Billy Mitchell’s sinking of the Ostfriesland than it is to the 1st carrier jet launch. The Navy still needs to demonstrate UCAS aerial refueling in order to complete an airpower revolution, but this is a very big step forward. US Navy | Northrop Grumman | Wind River | Defense Tech | DoD Live.
Carrier landing at sea!
July 2/13: UCLASS. Lockheed Martin touts a recent UCLASS demonstration at NAVAIR, but their focus is on back-end and Common Control systems, rather than the UCAV itself. Lockheed Martin:
“Using an open architecture framework integrated with DreamHammer’s Ballista [DID: link added] drone control software and Navy compliant software protocols, a single operator managed multiple UAS platforms [including Lockheed Martin's UCLASS concept] simultaneously. The team also used the new Navy Cloud capability to demonstrate control of the ISR sensors and fully integrate the data into one complete mission picture. The team then used this picture to rapidly re-task and re-route the UAS assets. In addition to using DreamHammer’s Ballista drone control software in this UCLASS demonstration, Lockheed Martin is teamed with DreamHammer Government Solutions in pursuit of the upcoming Navy Common Control System contract.”
June 28/13: JPALS/N-UCAS. Engility Corp. in Mount Laurel, NJ receives a $12.5 million cost-plus-fixed-fee contract, exercising an option for engineering services in support of the Joint Precision Approach and Landing Systems (JPALS) and the Navy Unmanned Combat Aerial Systems programs. JPALS is a ground or ship-based system that adds extra precision to GPS, and is used to help land aircraft. It’s a critical enabler for naval UAVs like UCAS-D, UCLASS, etc.
$4 million in FY 2013 RDT&E funds are committed immediately. Services to be provided include requirements definition and analysis; prototyping; test and evaluation; technical assistance; system analysis; engineering; software development, integration and maintenance; test data acquisition; reduction and analysis; technical logistic support; configuration management; training support; and program and project management.
Work will be performed in St. Inigoes, MD (95%); Providence, RI (3%); and Chicago, IL (2%); and is expected to be complete by in January 2014 (N00421-12-C-0048).
June 26/13: UCLASS. “The Navy has outlined the specifications for the Unmanned Carrier Launched Surveillance and Strike (UCLASS) in a requirements document obtained by USNI News.” the key numbers are:
Carrier and JALN-M network compatible, with take-off and landing in Sea State 3 (4′ waves) minimum, and SS7 (29′ waves) maximum.
Able to conduct a strike mission at 2,000 nmi.
Able to conduct 2 surveillance orbits at 600 nmi radius around the carrier, or 1 at 1,200 nmi radius.
3,000 pound payload, including day/night optical surveillance comparable to an MQ-9, plus a surface scanning radar including GMTI moving object tracking.
At least 1,000 pounds of that payload can be existing carrier weapons.
Enough stealth for surveillance missions in lightly contested areas.
Those requirements will be difficult to meet already. Now add a number of added requirement being floated at present, and ongoing disputes about how much stealth etc. is necessary. Sources: USNI, “UCLASS By the Numbers”.
May 17/13: Touch and Go. The X-47B UCAS-D follows its catapult launch with a touch-and-go landing on USS George W. Bush [CVN 77], which tests its ability to fly precision approaches to a moving target.
A touch-and-go doesn’t trap the wire, but throttles the engine to full and takes off again. Carrier-based planes have to be able to do that if they miss the wire and pull a “bolter,” which is a guaranteed way to get harassed by your fellow pilots. Not sure what you do to a UAV. Perhaps the Navy can offer a rotating pool of drone software programmers, available for friendly abuse via secure video conference. US NAVAIR | US Navy.
Carrier launch
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May 14/13: Carrier launch. An X-47B UCAS-D is maneuvered into position on deck, and launched from USS George W. Bush [CVN 77]. The US Navy, Northrop Grumman et. al. hail it as a revolutionary milestone. We’ll grant that launching amidst the busy, complicated, and dangerous goings-on of a carrier deck is unlike any land-based challenge. It’s a difficult task for humans, and a difficult task for computers to do with human help.
Having said that, this isn’t the complete circuit. It’s the next logical step after on-ship deck tests (vid. Nov. 26/12) and land-based catapult launch (vid. Nov 29/12). We’ve said before that they won’t have a revolution on their hands until they can do the complete circuit: maneuver, launch, fly a circuit, and land. The next revolution after that will involve aerial refueling. When they do these things, we’ll join the chorus. US NAVAIR | Northrop Grumman.
May 6/13: Trap. The X-47B UCAS-D demonstrator successfully traps the wire as it lands at NAS Patuxent River, MD’s shore-based catapult and arresting gear complex. Northrop Grumman.
April 12/13: Support. FBO.gov:
“This synopsis provides notice of the Government’s intent to solicit a proposal on a sole source basis from Sierra Nevada Corporation, 444 Salomon Circle, Sparks, NV for work providing support in troubleshooting, problem resolution, and anomaly investigation associated with the Precision Global Positioning System (PGPS) as part of the existing Unmanned Combat Air System-Demonstration (UCAS-D) Program. This request for proposal will be issued in accordance with the terms and conditions of Basic Ordering Agreement (BOA) N00421-10-G-0001.
This acquisition is being pursued on a sole source basis under the statutory authority 10 U.S.C. 2304(c)(1), as implemented by Federal Acquisition Regulation Part 6.302-1, only one responsible source and no other supplies or services will satisfy agency requirements.”
April 7/13: UCLASS. Lockheed Martin finally unveils their Skunk Works’ UCLASS design, which combines elements of their RQ-170 Sentinel stealth reconnaissance UAV with technologies from the F-35C for carrier operations, weapons use, etc. Overall, the design looks quite a bit like YouTube video.
March 26/13: UCLASS. NAVAIR indicates through a presolicitation that it plans to go ahead with follow-on Preliminary Design contracts to all 4 UCLASS study contract vendors (Boeing, General Atomics, Lockheed Martin, Northrop Grumman – vid. June 23/11), and continue the Unmanned Carrier Launched Airborne Surveillance and Strike program.
The contracts are expected by the summer of 2013, supporting up to 2 years of work on the UAVs, datalinks for communications and control, and the carrier operations segment. They’re expected to carry each design to the Preliminary Design Review by Q3 2014, and support post-PDR design maturation and follow-on engineering. The next step after that will be the selection of 1 winner, and UCLASS initial operational capability within 3-6 years. FBO | Defense Update.
Dec 21/12: Aerial Refueling. Northrop Grumman Systems Corp. in San Diego, CA receives a $9.7 million cost-plus-incentive-fee contract modification for Autonomous Aerial Refueling (AAR) demonstration activities in support of the N-UCAS program. Services will include completion of Delta Critical Design Review (DCDR), surrogate testing with manned aircraft, preparation for the X-47B demonstration, travel, and support technical data for the AAR demonstration activities.
Work will be performed in Manhattan Beach, CA (70%) and Patuxent River, MD (30%), and is expected to be complete in December 2013. All contract funds are committed immediately (N00019-07-C-0055).
Nov 29/12: Testing. An X-47B is launched using a land-based naval steam catapult, at NAS Patuxent River, MD. The releases are full of words like “historic,” but DID just doesn’t see it. Lots of UAVs have been launched by non-steam catapults, steam catapult technology isn’t new, and this isn’t a launch from an actual ship. It’s just a test to verify that the X-47B’s landing gear, body structure, and software, which were designed from the outset to handle the rigors of a steam catapult launch, can indeed do so. A milestone, yes, but a minor one.
When an X-47B is launched from an actual ship, and recovered aboard, that will be historic. Ditto for successful aerial refueling. US NAVAIR | Northrop Grumman.
X-47B deck tests
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Nov 26/12: Testing. An X-47B air vehicle arrives by barge from Naval Air Station Patuxent River, MD, and is craned aboard the USS Harry S. Truman [CVN 75] for deck handling tests aboard the ship.
One suspects that civil airspace certification for high-end drones can’t happen soon enough for NAVAIR and the US military. US NAVAIR.
Nov 15/12: Testing. Northrop Grumman announces that its UCAS-D team has successfully completed initial onshore trials of the Control Display Unit (CDU), a new wireless, handheld controller used for carrier-deck maneuvering. Tests were basic: control engine thrust; roll forward, brake and stop; nose wheel steering; and maneuver the aircraft efficiently into a catapult or out of the landing area following a mock carrier landing.
On-ship deck trials are next.
Nov 6/12: NASIF Testing. US NAVAIR discusses testing at the “N-UCAS Aviation/Ship Integration Facility.” If NASIF didn’t exist, the Navy would have to use an aircraft carrier for this sort of testing, and it can’t afford that. Hence the NASIF building, stocked with Primary Flight Control (PriFly), Landing Signals Officer (LSO), Carrier Air Traffic Control Center (CATCC) and Mission Control Element (MCE) equipment.
The UCAS-D program uses the facility for system integration of new equipment, and UAV/manned surrogate demonstration events. Events like final Human Systems Integration (HSI) modeling and simulation testing for sailors from USS Carl Vinson and USS Abraham Lincoln.
Instead of using the current method of controlling multiple aircraft with radar displays and voice radio, the event tested their ability to send and receive digital instructions to and from aircraft, in addition to using voice instructions. This capability is absolutely required for UAV, but it will also help manned fighters, whose 60-second landing spread includes a final 20 seconds of enforced controller silence. If the controllers can communicate with everyone else by text while a pilot lands, that’s a big step forward.
The controller teams showed they could handle it over about 20 test scenarios, which progressed from relaying UAV commands to a UAV mission operator for entry, to direct communication with the simulated UAV and more automated systems.
FY 2012
Aerial refueling expands to include both boom and drogue; How can it be a UFO, if it’s on a truck?
X-47B, Edwards AFB
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Aug 20/12: UCLASS. NAVAIR awards a small $440,315 firm-fixed-price delivery order to Rockwell Collins, for Phase II of the ARC-210 UCLASS feasibility study with JPALS.
ARC-210 radios are used to communicate with UAVs over UHF, and their software may need fine-tuning to work with UCLASS for all of the Navy’s requirements (N00019-08-G-0016-0076). Contract: FBO.gov.
Aug 13/12: UCLASS. Naval Air Systems Command releases a Request for
Information to evaluate the Draft Mission Effectiveness Analysis (MEA) Tool developed by the UCLASS Program Office. In practice this is a spreadsheet fed with warfare analysis models, where the user can input UAV parameters for comparative assessment (N00019-12-P7-ZD235).
The RFP should come in the fall with a down-select to a single design in 2016 aiming for IOC in 2020. The spreadsheet is classified SECRET/NOFORN. FBO.gov | Flight International.
Early July 2012: Testing. Members from the UCAS-D carrier integration team engage in extensive software testing aboard USS Harry S. Truman [CVN 75], talking to fleet air-traffic controllers and air-department personnel about the usability of the new software, and lessons learned. Land-based X-47B tests will continue at Patuxent River, MD, and the goal is a carrier landing in about a year. US NAVAIR.
June 14/12: UFO-G. US NAVAIR indirectly confirms that the wrapped object spotted on a truck in Kansas was UCAS-D AV-2 (vid. June 6/12 entry), being trucked across the country from Edwards AFB, CA to NAS Patuxent River, MD for the next phase of flight tests. Easier than getting the civil flight waivers, I guess.
June 8/12: JPALS. L-3 Service, Inc. in Mount Laurel, NJ receives a $12.5 million cost-plus-fixed-fee contract for engineering services in support of the precision GPS Joint Precision Approach and Landing System, and the Navy’s UCAS-D program. The 2 are highly connected, of course, since UCAVs will need to depend on precision GPS, in order to land on carriers (vid. the July 2/11 test). JPALS will also help manned fighters.
Services to be provided include requirements definition and analysis, prototyping, test and evaluation, technical assistance, system analysis, engineering, software work, test data acquisition, reduction and analysis, technical logistic support, configuration management, training support, and program and project management. Work will be performed in St. Inigoes, MD (95%); Providence, RI (3%); and Chicago, IL (2%). Work is expected to be complete in October 2012. This contract was not competitively procured, pursuant to the FAR 6.302-1, by the US Naval Air Warfare Center Aircraft Division in Patuxent River, MD (N00421-12-C-0048).
June 6/12: UFO-G. From the Augusta (KS) Gazette:
“This morning several Butler County Sheriff officers and KDOT personnel escorted a flatbed trailer entering Augusta from the south on US Highway 77 and headed east out of town on US Highway 54. Traffic was backed up coming in and going out of town. At first glance the strange-shaped cargo cloaked in industrial-strength shrink wrap appeared to be a saucer, but an unidentified KDOT worker advised it was an X-47B Combat Drone coming from Texas and en route to an unknown destination.”
Operating unmanned jets in US civil air space is a bit of a problem, which may help to explain the decision to ship it by road. Kansas is a rather roundabout route from Texas to Patuxent River, MD, but it is more of a straight line from California.
Jan 21/12: Testing. NAVAIR/AFRL’s AAR program completes a series of ground and flight tests that began in November 2011, using a Calspan Learjet surrogate with X-47B hardware and software, and a Omega Air Refueling K-707 aerial tanker. The tests included simulated flight demonstrations of both boom/receptacle (USAF) and probe-and-drogue (Navy & European) aerial refueling techniques, but no fuel was actually transferred, and Calspan’s Learjet wasn’t equipped for that anyway. The tests were all about correct positioning and coordination, beginning at a position 1 nautical mile from the K-707, and allowing autonomous guidance to move the Learjet into the 3 air-air refueling positions: observation, contact, and re-form.
Navy UCAS program manager Capt. Jaime Engdahl says that the next big step will involve using the actual X-47B. The team plans to conduct 2 more surrogate test periods before a planned refueling demonstration with the X-47B in 2014. NAVAIR | Northrop Grumman.
Nov 22/11: AV-2 flies. The fully-equipped UCAS-D demonstrator #AV-2 takes off for the 1st time at Edwards AFB, CA. That’s about a year late, but AV-1′s issues had to be ironed out first.
With 2 flying UCAVs, the program is expected to move AV-2 to NAS Patuxent River, MD by the end of 2011, and begin testing carrier landing technologies in 2012. That will include GPS-guided precision approaches to the carrier, arrested landings and “roll-out” catapult launches at land-based test facilities; and flight testing of new precision navigation computers and guidance/ navigation/ control software recently installed on both aircraft. The new suite of hardware and software is designed to let the X-47B land safely on a moving aircraft carrier deck. AV-1 will continue testing at Edwards AFB, with a focus on finding its flight limits. Northrop Grumman.
Nov 7/11: Aerial refueling. Inside the Navy reports [subscription] that the US Navy will be expanding the X-47B’s planned aerial refueling capability, to autonomously refuel while in flight with both USAF Air Force and USN aerial tankers.
The USAF uses KC-135s and KC-10s, but many of the KC-135s need to place an attachment on the refueling boom, in order to refuel probe-carrying aircraft. The US Navy has KC-130 Hercules aerial tankers, and its F/A-18E/F Super Hornets can become “buddy refuelers” with special wing tanks.
FY 2011
1st UCAS-D flight; 1st carrier landing using a surrogate plane; UCLASS study contracts.
“Look ma, no hands!”
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July 18/11: Northrop Grumman Systems in San Diego, CA receives a $25 million cost-plus-incentive-fee contract modification for UCAS-D autonomous aerial refueling technology maturation and demonstration activities. They’ll provide “air systems, air vehicle segment, and mission management segment requirements definition; integration planning and verification planning; and definition of certification requirements and approach.”
Work will be performed in San Diego, CA, and is expected to be complete in December 2012. US Naval Air Systems Command in Patuxent River, MD manages the contract (N00019-07-C-0055).
July 2/11: Testing. A contractor/government team lands an F/A-18D test aircraft from Navy squadron VX-23 on the USS Eisenhower in the western Atlantic Ocean, using hardware and software developed for the X-47B UCAS-D. This Hornet had a pilot on board as a safety precaution, but the system landed the plane. A King Air 300 twin-prop plane from Air-Tec, Inc. was also used as a surrogate to test mission management, command and control, communications, air traffic control and navigation, without executing an actual landing. Participating organizations included USN PEO Carriers, NAVSEA PMA-268, and the crew of the USS Dwight D. Eisenhower; plus industry partners Northrop Grumman, Rockwell Collins, Honeywell, L-3 Communications, SAIC, ARINC and Sierra Nevada Corporation.
It’s a big step forward for the UCAS-D program, and came after a series of interim steps detailed in the accompanying releases. It could also change the way Navy pilots land manned aircraft. Right now, carrier landings are very manual, and visual. All air traffic control instructions are by voice, and even a good portion of navigation data has to be read out over the air, while visual signals cement the final approach.
Supporting a UAV, and possibly retrofitted manned fighters, in future operations, required some important ship modifications. Eisenhower’s Landing Signal Officer (LSO) equipment was altered to communicate directly with the VX-23 F/A-18D through a digital network, and so were the ship’s primary flight control (“tower”) and Carrier Air Traffic Control Center (CATCC). The UAS operator’s equipment, installed in one of the carrier’s ready rooms, was the other key network node. Precision Global Positioning System (PGPS) capabilities with sub-1 meter accuracy were then added into the ship and the aircraft, to provide constant position awareness. US NAVSEA | Northrop Grumman.
Unmanned carrier landing!
June 23/11: UCLASS US NAVAIR awards a set of UCLASS study contracts to 4 vendors. Boeing publicly touted its own 8-month, $480,000 study contract, which includes developing of a concept of operations, an analysis of alternatives, and an investigation of notional solutions for various components of the Navy’s UCLASS program, which could be fielded for ISR and strike operations by 2018. Boeing’s option would include the X-45C Phantom Ray UCAV, but similar contracts for about $500,000 each were issued to Northrop Grumman (X-47B/ UCAS-D), General Atomics (Sea Avenger, also new EMALS/AAG carrier launch/recovery systems), and Lockheed Martin (unknown, has previously discussed the possibility of an unmanned F-35).
The UCLASS system will consist of an air segment (the UCAV), a connectivity and control segment, a launch and recovery segment, and a systems support segment. FBO.gov announcement | Boeing. See also March 28/11, March 19/10 entries.
UCLASS Studies
May 16/11: Northrop Grumman announces that it has picked up awards from the USAF Flight Test Center at Edwards AFB, CA, including Flight Test Team of the Quarter (above candidates like the F-35) for its X-47B/UCAS-D aircraft.
April 25/11: Sub-contractors. ARINC Engineering Services, LLC in Annapolis, MD receives a $9.7 million cost-plus-fixed-fee contract for technical and engineering services in support of the Joint Precision Approach and Landing Systems (JPALS) and Navy Unmanned Combat Aerial Systems (N-UCAS) programs. The 2 are related, as JPALS precision GPS-driven approach is a natural fit with the landing needs of a carrier-borne UCAV.
Work will be performed in Lexington Park, MD (80%), and St. Inigoes, MD (20%), and is expected to be complete in October 2011. This contract was not competitively procured by the US Naval Air Warfare Center Aircraft Division in Patuxent River, MD (N00421-11-C-0034).
March 28/11: UCLASS. US NAVAIR issues a Broad Agency Announcement regarding UCLASS, in solicitation #N00019-11-R-0031:
“The Naval Air Systems Command seeks proposals which conceptually demonstrate that a UCLASS system can provide a persistent Carrier Vessel-Nuclear (CVN) based Intelligence, Surveillance, and Reconnaissance (ISR) and strike capability supporting carrier air wing operations in the 2018 timeframe. In order to identify and explore available trade space… The program anticipates leveraging existing, deployed Department of Defense (DoD) systems to launch, recover, and control the air vehicle, transfer data in support of time critical strike operations, and conduct persistence ISR operations. The ongoing Unmanned Combat Air System-Demonstration program will inform UCLASS development and provide technology risk reduction for Unmanned Aircraft (UA) integration into carrier environments.”
March 14/11: Testing. A US Navy/Northrop Grumman Corporation test team issues a report stating that 5 weeks of dynamic load testing on X-47B air vehicle 2 (AV-2) demonstrated its ability to handle the stresses, strains and dynamic loads associated with carrier catapult launches and arrested landings, and air-to-air refueling. AV-2 is the X-47B airframe that will be equipped for air-to-air refueling tests.
The tests themselves finished on Jan 24/11, a week ahead of schedule. NGC AV-2 manager says they included 8 design conditions, including a 3-G symmetrical pull up, a 2.4G rolling pullout, and turbulence during aerial refueling; and 5 conditions expected to occur on the ground, including takeoff and landing tests involving the nose gear and tail hook. To conduct the tests, engineers bonded pads to 200 points on the airframe surface, and then pushed and pulled on those pads using hydraulic jacks to simulate various static and dynamic load conditions. Northrop Grumman.
March 1-4/11: Testing. The X-47B UCAS-D makes its 2nd and 3rd of 49 planned flights at Edwards AFB, CA. Testers are working to expand the flight test envelope in terms of air speeds, altitudes and operating weights, while testing key systems. Major c