AH-64D (Power On) Autorotation

[@thunderace4588]

Thank you for taking the time to make this video for us.

[@thefridge71]

Nice one mate. Great video series

[@TomP-148]

Good stuff

[@Rlaxox]

How can this be aurorotation when the power is on?

[@bradmicksflightrelatedthings]

Once you've reduced the collective to below around 10% or so, the upflow of air starts "driving" the main rotor instead of being "driven" by the engines. There are cluches attached to the transmission that disengage and allow the rotor to spin freely. There are two ways to verify you're in an autorotation: 1) torque < 10% and 2) a power turbine (Np) and main rotor (Nr) split. So if you see 102% or more on the engine page, you're officially in an autorotation and the rotor is being driven by the upward flow of air into the rotor.

[@Rlaxox]

@BradMicks Flight Related Things I tried turning the power levers off for autorotation and the bird just fell out of the sky.

[@greaselitenin]

​@@bradmicksflightrelatedthings I've always wondered: The rotor blades in normal operation spin counterclockwise driving air down for lift. When the collective is at 10% in an autorotation, I assume you still have some pitch angle in the blades. Wouldn't the air moving upwards now drive the rotor blades clockwise?

[@mcdjay]

Is this Casmo?

[@bradmicksflightrelatedthings]

No.