Hello Maverick,
Should be a building but here I am again......a few years back Hanno Pretner (excuse spelling all) had come to compete with designs of increasing complexity I do think yes even variable pitch propeller: then a little fairy appeared as his guest--NOOOOOOOOOOO not that one.... and the fairy said make it simple and TRUE-So home he flew-cause he had something to do- there at his work bench he sit and he sat- but we won't get into that-when out of the blue- with some pink for visability as a clue- he then drew- that "SUPRA FLY sure flew-

(seriously if you can get your hands on one go for it!