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Or lift ? Is it just two powered vectors which sum equals weight of autogyro. Plus for unpowered one - we need forward motion to provide air flow around rotor. Or zero for 100% powered rotor.

And this one, changing gross weight from 221.5, 321.5. Last one have similar rpm to 475 as provided in last example.. I think, that rpm should left similar to our unpowered version - ie same blade traveling at same speed will make same level of lift.

Newbie question - why does our rpm varies so much ? If pitch is the same ? As far as i know - in flight rotor rpm does not change too much. Tried with gyrocalc. pitch is varied 2; 4; 6 degree :

Ok. But AoA of rotor should also decrease. We need less power from air stream to power it ? And flat rotor = vertical vector 100% / horizontal vector 0%.

Thank you for reply. Could any comment this topic ? https://www.rotaryforum.com/threads/partially-powered-rotors-from-pra-magazine.46845/page-3#post-927054 Sadly, i do not know hp of main motor. But 125mph cruise is cool. Only in some other posts 30hp in some light airframe ?

Thank you for reply. Lets say - it is more on efficiency without too big complexity, than jumping or vertical start. So lets modify first post - move main motor to side for partial powered rotor torque compensation

Hello. Yes, i do agree - but as i was able to see - some with goped prerotator do left it working for take off. And if we have some airflow over our tail - not speed, we keep rudder effective. But yes - at zero speed with working prerotator and main engine failure you may crash. Safety device to...

Hello. Ben here, looking for some Far103 gyros. Yes you can make them or buy - but it will be 503 or 447 powered ones without any extra. No electric starter or prerotator. Unless hack with big cordless drill. And mostly limited to light pilots. But ! After reading a lot of Gyrhino and...