Reply to post: Re: Thrust driven swing wing

LOHAN ideas..

Poor Coco
Boffin

Re: Thrust driven swing wing

The moment resistance of a fixed wing can come from the mechanical properties of the skin, which will be far lighter than a hinge (because the opposite edges will be further apart and therefore subjected to much smaller tensile/compressive forces). Additionally this would obviate the requirement for energy storage for unfolding the wing — and using the engine thrust to open the wing is the worst possible approach, since that would mean unfolding the wing near the maximum airspeed. If you were to unfold the wing you would want it to happen near apogee, where the airspeed stresses are minimal.

The two advantages of swing-wings would be a more compact body at launch (which, given the essentially unlimited space around the craft, is an insignificant benefit) and the nullification of lift forces during the high-speed portion of the flight. But those could be zero anyway, if an airfoil section which is nearly symmetrical is chosen and flaperons are positioned at a slightly negative angle for the launch. Come to think of it, they needn’t even be flaperons; they could be standard ailerons with a lightweight, simple device to give slight negative displacement for the launch.

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