Prop Flange Kit - Kit includes a taper lock bushing and matching modified sprocket to provide the interface between keyed, straight shaft small gas engines and the Ultra-Prop. Prop Flange Kit with Pulley - Prop Flange Kit with 6" diameter pulley for driving an alternator. The Ultra-Prop can be easily cut down from 59 inches to any smaller diameter required without affecting balance.

An example of builder ingenuity: Ron Spiering used two engines and Ultra-Prop propellers to build a successful airboat that uses throttles for steering and eliminates the conventional rudders. Kit includes flange with pulley, taper lock QD bushing, two propeller backup plates, six tubular spacers, all hardware and key for straight shaft.

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