Not in this game.
And in the game a dead prop is an air-brake. You're better off with it windmilling at minimum RPM.
Short story: I got shot up one night with a radiator leak. I was low alt with two+ sectors to get home. I put it on auto climb until the engine temp climbed into the red-line (at ~7K), then leveled, shut the engine off, reduced RPM to minimum and set glide speed for 150 mph. When I reached 2K I powered up, bumped RPM all the way up and hit auto climb until the temp went into the red-line then repeated the process. I repeated the entire thing probably 10 times and made it home to land safely but it took quite awhile.
Actually, indeed in this game, and easily verifiable. I just did the following but five minutes ago:
1> Take a P-38, Mossie, or other multi-engine (as these have auto-feathering props).
2> Take off, set autoclimb, climb to a pre-determined altitude.
3> Once at that pre-determined altitude, DO NOT TURN OFF AUTOCLIMB. Instead, simply pull the throttle back to idle, keeping prop RPM at max. Record decent rate once it stabilizes.
4> Climb to previously determined altitude, and repeat this test with engines idling at low RPM-setting, and engines shut down (feathered).
The results will be as follows: Highest decent-rate will be with props spinning at high RPM. This is because, due to the high drag, the 'autoclimb' autopilot will need to pitch the aircraft down farther to maintain the set airspeed. The lowest decent rate, will be props stopped, with props spinning at low RPM being a bit worse for decent-rate, but not close to the rate with the props spinning at high RPM.
Conclusion: The faster the prop is spinning, the higher the drag it generates, and a stopped-prop creates the lowest drag. Even in this here game with its cartoon airplanes.
