Which term refers to the power delivered at the main drive or main output of an aircraft engine?

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Multiple Choice

Which term refers to the power delivered at the main drive or main output of an aircraft engine?

Explanation:
Power at the main drive is the engine’s output at the crankshaft, measured as brake horsepower. It’s the usable shaft power the engine can deliver to the drive system, determined on a dynamometer by braking the engine and calculating torque times speed. This represents the power available before losses in the drivetrain (such as gears and the propeller) are taken into account. The other options are unrelated: calibrated airspeed is a speed measurement, RNAV is a navigation system, and balloon is just an object.

Power at the main drive is the engine’s output at the crankshaft, measured as brake horsepower. It’s the usable shaft power the engine can deliver to the drive system, determined on a dynamometer by braking the engine and calculating torque times speed. This represents the power available before losses in the drivetrain (such as gears and the propeller) are taken into account. The other options are unrelated: calibrated airspeed is a speed measurement, RNAV is a navigation system, and balloon is just an object.

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