3 ms·

If you have fixed pitch, you can't really autorotate anyway. Safety would be provided by redundancy. With collective pitch, it becomes interesting. Does the mo

If you have fixed pitch, you can't really autorotate anyway. Safety would be provided by redundancy. With collective pitch, it becomes interesting. Does the motor help or hinder autorotation? In a hybrid system, you anyway decouple the propeller and turbine with the electric system. Your car gearbox operates at much lower speeds (because it's not attached to a turbine) and has a lot less weight constraints. Helicopter powertrains require a lot of maintenance. The stack exchange link talks about jetliners while we're talking about copters.

Alupis 9y ago
> If you have fixed pitch, you can't really autorotate anyway Helicopters are not fixed pitch... your run-of-the-mill hobby multi-rotor is, but that's due to the reasons mentioned above in my previous posts (eg. simplicity at this small scale). > Safety would be provided by redundancy Unless you suffer a total electric failure. Or even just a failure on one side of the aircraft (or even just one motor, in a quad setup). Being able to mechanically work these systems is fairly important, since it's less likely both mechanical and electrical systems fail simultaneously. > In a hybrid system, you anyway decouple the propeller and turbine with the electric system Unless your electric system is the failure. > Your car gearbox operates at much lower speeds (because it's not attached to a turbine) Even some model multi-rotors use gearboxes. You have a motor, spinning either slower or faster than the desired RPM for the rotors... a gearbox solves that difference, and provides a mechanical means of fully decoupling from the motor should the need arise. > Helicopter powertrains require a lot of maintenance This is true, but this is not really an issue... and nobody really is looking to "solve" this non-problem. Aircraft require a lot of maintenance and inspections.

Alupis 9y ago

> If you have fixed pitch, you can't really autorotate anyway Helicopters are not fixed pitch... your run-of-the-mill hobby multi-rotor is, but that's due to the reasons mentioned above in my previous posts (eg. simplicity at this small scale). > Safety would be provided by redundancy Unless you suffer a total electric failure. Or even just a failure on one side of the aircraft (or even just one motor, in a quad setup). Being able to mechanically work these systems is fairly important, since it's less likely both mechanical and electrical systems fail simultaneously. > In a hybrid system, you anyway decouple the propeller and turbine with the electric system Unless your electric system is the failure. > Your car gearbox operates at much lower speeds (because it's not attached to a turbine) Even some model multi-rotors use gearboxes. You have a motor, spinning either slower or faster than the desired RPM for the rotors... a gearbox solves that difference, and provides a mechanical means of fully decoupling from the motor should the need arise. > Helicopter powertrains require a lot of maintenance This is true, but this is not really an issue... and nobody really is looking to "solve" this non-problem. Aircraft require a lot of maintenance and inspections.