What factor causes reduced RPM in an air-driven gyro?

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Multiple Choice

What factor causes reduced RPM in an air-driven gyro?

Explanation:
Air-driven gyros derive their spin from the air that flows through a driving turbine. The rotor speed depends on the mass flow of air entering the gyro (mass flow = density × velocity × area). If the air density is reduced, the same flow velocity carries less air mass per second, delivering less torque to the turbine and causing the rotor to slow down. So reduced density directly leads to a lower RPM for the gyro. Higher density or greater air supply would push RPM up, while warmer, lighter air (which reduces density) would lower RPM as well, but the immediate and direct factor in this context is the reduced density.

Air-driven gyros derive their spin from the air that flows through a driving turbine. The rotor speed depends on the mass flow of air entering the gyro (mass flow = density × velocity × area). If the air density is reduced, the same flow velocity carries less air mass per second, delivering less torque to the turbine and causing the rotor to slow down. So reduced density directly leads to a lower RPM for the gyro. Higher density or greater air supply would push RPM up, while warmer, lighter air (which reduces density) would lower RPM as well, but the immediate and direct factor in this context is the reduced density.

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