BOOMERANG Available From 18” - 44” Diameters, And For 1¼” - 3” Shaft Diameters
For decades, feathering propellers have operated as a result of the water flowing over the blades, combined with some friction of the shaft and/or transmission.
In recent years, radical changes in sailboat engine transmissions have created new issues for propeller manufacturers. These include the advent of hydraulic transmissions as well as the electronic gear shifting. In both cases, the transmission (whether in gear or not) presents almost zero drag on the shaft when the engine is not running. Some shaft drag is always necessary for a propeller to either fold or feather. However, with these new types of transmissions, there is no drag and the helmsman does not have any mechanical way to slow the shaft down from freewheeling when the engine is stopped. To that effect, the Max-Prop engineers have invented a patented radial spring which is incorporated inside the body of the Boomerang model. This spring solves the feathering issues by forcing the blades back into a feathered position as soon as no torque is applied to the shaft. Once the engine is either in idle or shut down, the blades will feather within seconds, regardless of the shaft rotation or the boat speed at the time.
The Boomerang model has been in testing since 2016 and has already been adopted by many European boat builders.
FEATURES
• Assisted feathering • Very efficient power • Outstanding reverse and stopping power • Ultra smooth operation • Very low drag • Simple "bolt on" installation • Externally adjustable pitch • Available from 18" to 44" diameter • For shafts 1¼" to 3" • Maintains feathered position in high speed, turbulent operation
SIMPLE INSTALLATION Due to the design of the Max-Prop Boomerang, installation is a simple bolt on and can be done in or out of the water.
LOW DRAG A 5 blade Max-Prop Boomerang on a high angle shaft will have substantially less drag than a fixed 2 blade propeller while providing much more power while motoring.
ASSISTED FEATHERING
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.
TO ORDER VISIT WWW.PYIINC.COM OR CALL 425-355-3669
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