secret helicopter
Slowrotor. 20ft rotor span,8inch cord 0012. tail rotor 4 inch cord 0012. underslung teetering rotor head machined from solid alloy.main and tail rotor driven via v belts through a 90 digree gearbox to get drive from a horizontally mounted rotax. empty weight 385lbs. my calcs said it should lift with 500 rpm on main rotor, but it would lift of at 360. the plan with this machine was to see if i could get the sums right. The machine was very stable and vibration free. It was not my intention to do anything more than a tetherd test with this machine, it was purely to see whether i had the correct set up. I am now working on mk3 using a three cylinder bmw engine and a lot of composites to get that power to weight ratio improved.