Definition
A unit of power equal to 1,000 watts. Power is the rate at which work is done or energy is used. In aviation performance discussions, kilowatts are sometimes used alongside or in place of horsepower to express engine output, where 1 horsepower equals approximately 0.746 kilowatts.
Plain English
A measurement of how much work an engine can do in a given amount of time. One kilowatt is 1,000 watts, and it's another way of saying horsepower — about 1.34 horsepower for every kilowatt.
Context Anchor
Seen in climb performance discussions when aircraft power is shown in metric units instead of horsepower.
Derivation
From the Greek 'kilo' meaning 'thousand,' and 'watt,' named after James Watt, the Scottish engineer who improved the steam engine. So a kilowatt is literally one thousand of the units named after the man who first made power something engineers could measure.
Why Pilots Care
Engine power expressed in kilowatts directly affects climb rate, thrust available, and overall performance figures used in flight planning.
Intuition Check
Do not read kw as a weight or distance value. In this context, kw means power: how strongly the aircraft system can produce usable energy over time.
Example Sentence 1
The engine produces 134 kilowatts at full power, equivalent to about 180 horsepower.
Example Sentence 2
Converting the published horsepower figure to kilowatts helped compare the climb performance of two different training aircraft.