mark IX

My Feedback: (9)

What is the relatonship between prop pitch speed and model level flight speed?

Thanx, Mark

daveopam

My Feedback: (9)

Sorry Mark. Way too many variables. As an example a thick wing profile or 3D only plane turning a 13x8 at 11,000 RPM will have more slippage than a pattern type plane with retracts and a thin airfoil turning the same prop at the same RPM. There is probably a formula if you knew the CD of a particular airframe. It's way over my head if so. You might ask some of the guys in the aerodynamics forum if you don't get an answer here.

David

aeajr

My Feedback: (2)

Pitch speed is the calculated speed of a propeller moving through the air at a given RPM with ABSOLUTELY NO SLIPPAGE IN THE AIR. It is a theoretical number that could only be achieved if the aircraft had no wind resistance.

It is like climate and weather.

Climate is what you expect.
Weather is what you get.

Your actual airspeed will not exceed your pitch speed in level flight and will normally be less, as per my statement above.