Pilot Institute Practice Test

In direct drive, the propeller moves at what speed relative to the engine?

Half the engine speed A fraction depending on gearing The same speed as the engine Twice the engine speed

Correct Answer:

The same speed as the engine

Explanation:

Direct drive means the propeller is bolted directly to the engine crankshaft with no gearing. Because there’s no gear train to change the speed, the propeller’s angular velocity matches the engine’s exactly. So if the engine is turning at, say, 2,600 rpm, the propeller is turning at about 2,600 rpm as well. In contrast, gear reduction would slow the propeller relative to the engine, and a setup that speeds the propeller up would require gearing not present in direct drive.

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