Please indicate your exact shaft diameter in the note text field during checkout.
The Max-Prop Whisper uses five blades to provide ultra-quiet operation and impressive thrust. The resulting improved powering performance is especially noticeable when powering against heavy wind and seas. The five blade design also provides for a substantial noise and vibration reduction in all conditions.
The Whisper is based on the "Easy" design, so it ships fully assembled, making installation and pitch changes simple and fast. The pitch is adjustable 2 degree increments, providing the ability to fine tune the loading of the engine. Moreover, pitch adjustment can be done in the water as the propeller does not need to be disassembled to change the pitch.
The Whisper is designed for large vessels with heavy displacement. Which can benefit from the extra thrust and quiet performance of a five blade propeller.
In forward the Max-Prop will offer 96% of the efficiency of a fixed blade propeller of the same diameter and pitch. The 4% loss in power can usually be eliminated by precisely matching the pitch of the Max-Prop to fit the boat engine combination. The three blade has a major advantage when going against heavy winds and seas, it will maintain the boat speed up to 30% better than the two blade.
The Whisper provides 80% more power than a comparable fixed blade propeller. The Max-Prop utilizes the same leading edge in forward as it does in reverse giving the propeller the same thrust in both directions dramatically improving control and power in reverse.
A five blade propeller will offer the smoothest possible run under power, quieting down your drivetrain.
Just like a other Max-Prop propellers, the Whisper feathers to a low drag position while sailing. Under sail the Max-Prop will increase sailing speed by about 15%, the largest difference being noticed when sailing in light air. When sailing with a fixed propeller the vessel has to overcome the fixed blade drag, installing a Max-Prop maximizes sailing performance.
The installation of the Max-Prop Whisper is very simple. The propeller is delivered assembled. Just slip the hub on the shaft, thread and tighten the nut, thread the two, lock screws for the nut, install the zinc anode (3 screws), and it is done!
If your engine achieves either too much or too little RPM at max throttle, 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 fully disassembled to change the pitch.
Check out the Barnacle Dissolver to clean your propeller. It's a safe easy way to clean the barnacles off your propeller.
Available for shafts 1" to 4" or metric equivalent.
When ordering please specify your shaft diameter in the "Note to PYI Inc." text box. See example below.