The Max-Prop Boomerang is available from 18" to 44" diameters, and for 1-1/4" to 2-1/2" shaft diameters.
The new Max Prop five blade Boomerang, feathering propeller offers an alternative to the use of a shaft brake for high speed sailboats and those with an electronic shift mechanisms. With the help of an internal spring, the Max-Prop Boomerang automatically and immediately feathers to its low drag position when the engine is shut down or put into neutral.
For decades the process of feathering a propeller has been the result of water flowing over the blades and some friction in the drivetrain once the engine had been shut down. But with the advent of more modern hydraulic transmissions with less friction it sometimes has been necessary to add a shaft brake on larger vessels to assist in the feathering of the propeller. The new Boomerang Max-Prop model eliminates this need, resulting in a lower hardware expense and less weight without a shaft brake.
The Boomerang has been in testing for over a year and is now being sold throughout the world. Several large Catamaran builders and some large custom monohulls have already adopted the Max-Prop Boomerang.
The Max-Prop Boomerang has 96% efficiency of a fixed blade propeller in forward. The torque of the shafts opens the blades immediately to the most efficient pitch in both forward and reverse. Maximizing efficiency under power with five blades to get the vessel moving and keep propeller noise to a minimum.
The Boomerang does not require water flow to feather the propeller. The internal spring brings the propeller to the feathered position. Perfect for use with Electronic shift mechanisms and Hydraulic transmissions.
If your engine achieved too much or too little Rpm at maximum throttle, you can adjust the pitch to a higher or lower setting to attain the correct Rpm. Pitch adjustment can be done in the water as the propeller does not need to be disassembled to change the pitch.
The Max-Prop Boomerang provides 80% more power than a comparable fixed blade propeller. The Classic utilizes the same leading edge in forward as it does in reverse giving the propeller the same efficiency in both directions dramatically improving control and power in reverse.