Definition 1 of 2
Definition
A specially designed propeller used in place of a flight propeller when an aircraft engine is being run on a test stand. A test club has short, wide blades that produce the airflow needed to cool the engine and impose a measurable load, but it is not intended to produce useful thrust or be flown.
Plain English
A stubby propeller bolted to an engine during ground testing. It moves enough air to cool the engine and gives the engine something to work against, so technicians can check how it runs without ever leaving the ground.
Context Anchor
Seen in aircraft maintenance, engine testing, and engine run-up after repair or overhaul.
Derivation
The word 'club' here refers to the blade shape -- short, thick, and stubby, like a wooden club -- compared to the long, slender blades of a flight propeller.
Why Pilots Care
It enables mechanics to verify engine operation and performance safely without the danger of unintended movement or takeoff.
Intuition Check
Do not read “club” as a group of people or an organization here. In this term, a test club is a physical engine-testing device shaped somewhat like a short, heavy propeller.
Example Sentence 1
After the overhaul, the mechanic mounted a test club on the engine and ran it on the test stand to check oil pressure and cylinder temperatures.
Example Sentence 2
Using a test club allows full power checks without the aircraft taxiing forward.