Secret helicopter
Spaced. got hold of a computor programme to give me power requirements, rotor diameters and blade sections etc. Drew up a frame using the theory that if it looks right it must be right, and just worked on it day and night. the stress analysys was only calculated on the rotor system as this was the obvious one that would bite me if i got it wrong. Paid meticulous attention to blade balance. The mistakes i made were on the vee belt drives as they would slip if you pulled collective too fast. Whilst i know to correct proceedure would have been design, stress calcs, build,etc beacuse it was only intended as a tethered test bed, i learned more from actually making it. It seems a common problem with anyone thinking of building one that the more they think about it,the more problems they see, and it never gets made. The big problem is once you have done one you cant stop, im on my third