Martin posted a discussion
Landing on a forest clearing ( or on a short field in general)
HiI was presented with the following problem a few days ago: how to precisely land on a forest clearing or a small field. A conventional landing wouldn't work because the fields are surrounded by tall trees and the ground is not flat and probably full of small trees and bushes. The size of the clearings is unknown.I have considered the following methods for precise and short landing:Spoilers - increase drag and reduce lift.Pros: steepen the glide slopeCons: increase stall speedFlaps - increase lift and drag.Pros: reduce stall speedCons:Deep Stall Landing - the airplane "falls" to the ground in a stable stall.Example --> http://youtu.be/dRr4AVZgr0Q?t=1m23sPros: low horizontal speed (short landing distance)Cons: high vertical speed ( about 5 m/s or more), might damage the payloadParachute - the parachute can be attached either to the entire plane or the payload alone. In the after-mentioned case the payload would be dropped by parachute and the plane could be landed normally on a short field because it has become very light.Pros: precise landingCons: complex deployment system, has to be correctly packed, extra weight on the plane, might get stuck on a treeHover landing - the plane pitches up, achieves a stable hover and hovers vertically to the ground.I have not seen this method being used. I've only seen aerobatic planes and foamies hover like this.Pros: low vertical speed, precise landingCons: no idea whether it works, requires a big motorNet landing - the plane lands in a net of some sort. The plane dives into the net.Pros: precise landingCons: the net would be a hassle to set upI do not have any experience with any of the mentioned landing methods. I would like to keep things very simple and not use a parachute or a net for landing.I am not sure whether flaps/spoilers are enough to steepen the glide slope enough to make a very short landing.I really like the deep stall method, because of its simplicity, but am afraid that the vertical speed is too high for a safe landing.I also like the hover landing, but I don't even know if the idea is reasonable or not.What are your thoughts on this subject? What method would you suggest?Do you know any other methods for making short landings?RegardsMartinSee More