RPMs

RPMs
Rotations Per Minute. A unit of measure for such things as engine speed
standard rate turn
A turn of three degrees compass heading per second ...

Climb at full power, retract the flaps and set the prop at 2400 RPMs and hold best rate of climb (Vy) of 69 knots. The Katana climbs smoothly at about 500-600 fpm with two of us aboard and almost full fuel. Not spectacular, but very comfortable.

As the RPMs increase the airplane begins to move forward.slowly at first.and then your ground speed begins to build. Steering, while on the ground, is done with the rudder pedals.

Higher altitudes call for higher power settings (rpms), in order to deal with increasingly thinner air--the propeller has less to bite into.

Revenue Passenger Miles (RPMs)
Revenue per Available Seat Mile (RASM)
Revenue per Employee ...

on-flight trip length - The distance traveled by a passenger on a single flight number (i.e., coupon). Average is computed as the ratio of RPMs flown to passengers enplaned and commonly referred to as length of haul.

There is a rotational version of this law, asserting that the rotational force (i.e. torque) equals the rotational inertia times the rotational acceleration. That means whenever the engine RPMs are increasing or decreasing, a torque is produced.

See also: Aviation, Flight, Power, Aircraft, Airport