Originally posted by pcm
After your plane takes off and your engine unloads what do you guys figure for additional RPM`s.
As a rule of thumb I always figured an extra 1000 but I have no idea if this is correct or even close.
It will unload if you are in a dive or flying at full throttle on the level but it will load down to something less than you get on the ground when you load it in a vertical climb or large loop.
Getting the peak rpm is interesting but not useful for selecting props. You need a data logger to continuously sample the rpm through your maneuvers. You'd also like to have airspeed too to select the best prop.