In flight mechanics, “power input” refers to the total power supplied to the aircraft’s propulsion system. It represents the energy consumed by the engines or any other propulsion devices to produce thrust and propel the aircraft through the air. Power input is a crucial parameter in assessing an aircraft’s performance, as it directly affects its speed, rate of climb, range, and other flight characteristics.
high propeller efficiency Vj
M means mass
V(infinite) means velocity