Author Topic: Man Pressure Vs RPM (Read 387 times)

WOZ30BAT · « **on:** July 20, 2005, 11:08:05 PM »

I use my throttle to control manifold pressure, but it seems dropping RPMs slows me down quicker. Is this correct & is it true @ all alts or does manifold pressure drops slow you quicker @ higher alt?

stantond · « **Reply #1 on:** July 21, 2005, 09:23:15 AM »

I have seen little to no braking effect (if that is what you are referring to) for constant speed (CS) propellers during landing. Maybe I am not doing it right, but ordinarily when you reduce manifold pressure in a CS prop engine and decscend for a landing the CS prop will slow the plane down noticeably. In AH prop braking seems to have little effect.

Side slipping the plane by rudder use and landging gear are the best ways to slow down. That is, of course, if you have any intention of landing the plane so it is useable again.

Regards,

Malta

Loddar · « **Reply #2 on:** July 21, 2005, 10:36:08 AM »

Don't set throttle and RPMs to min and
dive from 25k to near deck. It's the only
way to loose wings in a P47

Kermit de frog · « **Reply #3 on:** July 22, 2005, 01:17:34 PM »

If you want to slow down, throttle back, but keep your RPMs high. The prop's AoA will change if you reduce RPMs. High RPMs allow the blade of the prop to take a huge chunk of the air, but with no throttle, it works against you. Remember, rpms change in relationship to propellers angle into the wind.Slowing down your RPMs will reduce drag.