Description: Propeller; In Tank, High Frequency Oscillating Tone.

Description: Propeller; In Tank, Start, Fast Rev Up, Steady Whine Up And Down, Lower Speed.

Description: Propeller; In Tank, Steady Whine, High Speed.

Description: Propeller; In Tank, Start, Fast Rev Up, Steady Whine Up And Stop, High Speed.

Description: Propeller; In Tank, Start, Fast Rev Up, Steady Whine Up And Stop, High Speed.

Description: Propeller; In Tank, Start, Fast Rev Up, Steady Whine, High Speed.

Description: Propeller; In Tank, Start, Fast Rev Up, Steady Whine, High Speed.