Prop Balancing

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CONTENTS

Reaming the Prop to Size

First of all you need to use the correct prop reamer for the engine you are mounting the prop to. A prop reamer is designed to follow a hole accurately. An improperly reamed prop will not balance properly.

There are two types of prop reamers available

SAE Identified by 4 sizes of reamers.
Metric Identified by 3 sizes of reamers

Check the engine specs to determine prop shaft diameter to determine the correct reamer to use and ream the prop to size.

Use a good quality prop balancer and set the prop to a horizontal position.

The heavy blade will drop. Remove weight from the blade that drops by scraping the front or back of the blade with a sharp knife or razor blade working toward the outer tip or spray clear enamel on the light end..

DO NOT remove material from the trailing edge or the tips.

When it balances in the horizontal position rotate the prop 180 degrees. It should still be in balance. If not, the mounting hole is off-center vertically.

Next place the prop vertical. If either blade drops then the mounting hole is off center horizontally.

A perfectly balanced and centered prop will stay in "ANY" position it's placed in.

Check the prop in at least four positions.

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