The DE LAVAL is not bad neither...to use the exhaust gas to feed the machine which has not to be on the rotor...a sketch Victor?
- the wheel inside a tube or a case ( like the torque converter...)
- less noise, no torque...
- less efficient then a turbine but... so what?
oh sorry !!! you talk about pre-rotator okayyyy !!!
i didnt sleep enough
you think in ducting the exhaust gases to a "de laval" mounted on the plate... would be simpler to use a pneumatic tool to pre-rotate (i dont tell the dirt !!)
well if i had to think to a pre rotator, it would be accordingly to my rotor design :
3 bladed hingeless, in-mast cyclic controls, in my tractive design (engine is behind pilot)
i can use the shaft to pre-rotate rotor by a flexible acting on a crown or pulley
maybe a small turbo to blow air with a deflecting vane engine/rotor.
andré, i replied to you, i still thinking
you have good arguments for tilted rotor no doubt.
if i was to go on gyro, id better begin by buying a used bensen-like, of french guepard and fit it... sounds possible for about 3-6000 eur.
theres a great probability i ll begin this way befor begin to build my own helico/gyro.