Why You Need a Prop Stop

Fuel Efficiency, Performance, and Safety are the 3 top reasons prop stop is a must for both your tool box and on-board tool kit.  The patented pending prop stop design will hold your valuable, finely tuned propeller from the trailing edge of the blade.

Fuel Efficiency	Performance	Safety
A bent or damaged propeller blade is inefficient and de-creases your props hydrodynamic efficiency. Imagine trying to cut a piece of leather with a butter knife vs. a razor blade Get the idea? Doesn't it seem wrong to smash the leading edge of the prop blade into a block of wood?
A bent or damaged propeller blade will de-crease your engine rpm’s and cause vibration.  The loss of rpm is going to affect both your cruise speed and top speed.  Think about what happens when you stick your arm out of a moving car window, if you have your hand parallel with the horizon it glides through the air much easier than if you turn it perpendicular to the horizon. Makes sense right?
The Prop Stop keeps your hands away from the sharp edge of the propeller during installation and removal. When a prop blade breaks at any given rpm it becomes a weapon flying in any given direction.  The Prop Stop eliminates the fatigue on the thin, fragile, leading edge and tip of your prop and transfers that pressure to the thickest part of the blade on the trailing edge closer to the hub. The advantage of holding the prop stop in your hand helps you avoid over tightening which causes more prop losses and failures than most people realize. (read more…..go to prop use and basic facts of brass nuts section along with increased leverage of holding the tip)  If that prop breaks or comes off it will very difficult to get home right?

How it Works

The method and principle behind prop stop is very simple.  The prop Stop holds the blade on the trailing edge by creating equal pressure on opposite sides between two cogs.

• PS-17 is for all speedmaster, bpm, arneson, and bravo III applications (where 100 ft lb of torque is recommended)
• PS-14 is recommended for all other drives requiring up to 55 ft lb torque
• We recommend the anodized prop stop for use in a salt water environment.

FAQ, Helpful Hints, Facts and Figures

A brass prop nut will fatigue long before the stainless shaft you are screwing it on to.  For example if you over tighten the nut, which the prop stop helps avoid,  you can actually strip the threads from the insides of the nut and  cause the propeller to come off under load leaving you stranded miles from shore.

By placing and enormous amount of pressure on the tip of a propeller blade the fatigue in that ear could cause failure.

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