Thrust Ability propeller Tap-4B series is designed to increase the effectiveness, and maneuverability of high performance displacement fishing vessels and workboats. The Tap-4B propeller also reduces vibration. New research and development incorporates NACA blade sections, variable pitch dispersal, 10 degrees of rake with little skew. The foil sections and large hub dimensions maintain a high level of strength and resist damage. The Tap-4B is a 4 bladed propeller with diameters from 40” to 120”. Designed for speeds up to 18 knots.