Yet Another Weird Airplane

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Well-Known Member
Feb 6, 2011
Salem, Oregon, USA
Gentlemen I present the Chappedelaine Aérogyre
From a Facebook posting in French,, translated by Google
"The Aérogyre Chappedelaine (France - 1934). Studied in the early 1930s by Mr. Chappelaine with the collaboration of Mr. Desgrandschamps, the Aerogyre had to solve the problem of landing at very low speed. "An elongated surface placed in a current of air and mobile around its major axis of symmetry, rotates indefinitely around this axis and generates a lift much higher than that obtained with the same surface fixed however under the most favorable angle. ". In the case which concerns us, it is appealed to the effect of rotor produced by a wing which one lets turn freely around its longitudinal axis. Discs, at the ends of the wings, limit the marginal losses, and, as a result, increase the yield. If the speed of rotation is mechanically accelerated, there is a noticeable improvement in performance. Thus the normal flight could be carried out with the fixed rotor, working like an ordinary wing, disengaging it only to return to the ground (speed of rotation of 3 revolutions - second). The Aerogyre consists of a 12m² rotating wing surmounted by a small fixed upper wing of 6m² to have a warping system. However, the final Aerogyre would only have rotating wings that could be immobilized. A differential mechanism will allow the pilot to vary the speed of auto-rotation of each of the wings when they turn, or to vary their incidence in the case of fixed-wing flight. Moreover, by means of a transmission and a clutch, it would be possible to activate, thanks to the engine, the rotation of the wings so as to reinforce, at will, the hyper lift of the wing. This wing layout was mounted on a Caudron Luciole fuselage, some elements of which have been reinforced, and the fin significantly enlarged. As the Aérogyre must return to the ground under a very steep slope, from 30 to 35° on the horizontal, with a vertical speed of 4 to 5 meters per second, the firm Messier has built, for this device, legs long-stroke elastic landing pads. Unfortunately, the development test flight conducted near Chevreuse ended tragically because a part having broken, the Aérogyre fell in a garden in the town of Magny les Hameaux and was completely destroyed. The pilot, Roger Rigaud, was killed instantly."


Well-Known Member
Dec 29, 2019
love the concept
though what is clear is that the forces involved would require essentialy perfect balance of all
the moving parts and no play,none
and even then all the forces on a standard wing would be there and are going to occelate and
by the time it gets strong enough to hold together
its going to be HEAVY
wish they had done that
looking close at the photo,the rotorwing tips are up on stands,and there are cross bars and cables on the rotor wings,and full span ailerons on the upper parsol cantelever wing,lots going on


Well-Known Member
Sep 3, 2021
"Better way to build a mouse trap" A video of that maiden flight would probably be interesting. Dennis


Well-Known Member
Sep 15, 2013
Seattle, WA
I wrote an article for Sport Aviation a few years back on some of the weirder aviation patents I'd come across. This was one of my favorites....Lift propellers between the wings of a biplane, with flapping panels like skillets to open up and let the air through during VTOL operations.

I've colorized half the original patent application to highlight the features.
skillet surprise.jpg

Ron Wanttaja