Definition
The amount of work that defines one horsepower. One horsepower equals 33,000 foot-pounds of work performed in one minute, which is the same as 550 foot-pounds per second. A foot-pound is the work done when a force of one pound moves an object one foot.
Plain English
It's the standard measurement that says what one horsepower actually equals: lifting 33,000 pounds one foot off the ground in one minute, or any equivalent combination of weight, distance, and time.
Context Anchor
Seen in aircraft engine and performance discussions when horsepower is being explained.
Derivation
The figure traces back to James Watt in the late 1700s. He measured how much work a strong draft horse could do in a minute and rounded the result to 33,000 foot-pounds per minute. He used this benchmark to sell his steam engines by comparing them to horses. The number stuck and became the formal definition of one horsepower.
Why Pilots Care
It forms the baseline for rating engine power output, directly affecting aircraft performance comparisons and capability assessments.
Grounding Statement
Picture lifting a 330-pound load straight up 100 feet in one minute. That effort equals one horsepower.
Intuition Check
Do not read this as a weight limit. It is a rate of doing work: how much force is moved through how much distance in one minute.
Example Sentence 1
By definition, one horsepower equals 33,000 foot-pounds per minute, so a 200-horsepower engine can do 200 times that amount of work each minute.
Example Sentence 2
Power output is often converted to 33,000 foot-pounds per minute when calculating total work done by the engine.