Definition
The useful power an aircraft's powerplant delivers to move the airplane forward through the air, equal to thrust multiplied by velocity. It represents the rate at which the engine and propeller (or jet) actually do work pushing the aircraft through the air, as distinct from the total power produced by the engine itself.
Plain English
The amount of work per second that actually goes into moving the airplane forward, rather than being lost as heat, noise, or wasted air motion.
Context Anchor
Seen in range performance discussions, especially when comparing how much useful forward motion the airplane gets from the fuel it burns.
Derivation
From Latin propellere, 'to drive forward.' Propulsive refers to whatever drives the aircraft ahead, so propulsive power is the share of the engine's power that genuinely pushes the airplane through the air.
Why Pilots Care
It directly affects how far the aircraft can fly on a given amount of fuel.
Grounding Statement
Picture the airplane in cruise: the engine and propeller may be making power, but propulsive power is the portion that is actually pulling the airplane ahead through the air.
Intuition Check
Do not read “power” here as simply the engine power setting. In this context, propulsive power means useful forward-moving power, not just power produced by the engine.
Example Sentence 1
At cruise speed, only a fraction of the engine's rated horsepower becomes propulsive power, because the propeller and airflow losses absorb the rest.
Example Sentence 2
Lowering propulsive power in level flight reduces fuel flow and increases range.