[{HVY}A10inbound]

When a prop is feathered it is set to its '0%' position, so the tips of the blades are more/less pointing straight into the relative wind so the drag on the dead prop is minimized. So it's kinda like stream lining it. I also know that in order to feather a prop or make any prop adjustment the engine has to be running because the blades twist to the desired angle using oil pressure and a weight system under the spinner. So if the engine is dead and there is no oil pressure then the blades wont adjust.