Changing prop hub diameter

[Dundee]

Can a solid brass prop have it's hub diameter increased from 1" to 1 1/4"? This is a solid brass inboard prop. No rubber hub.

[Fastjeff57]

You mean the shaft size? If so, I would think so without a stress problem. Prop makers make the hub for various sizes, including larger than only 1 inch.

Jeff

[Dundee]

I have gone to a 1 1/4" shaft from a 1" shaft on a solid brass keyed inboard prop. Can the brass 1" hub be cut out to 1 1/4" with the existing key way?

[champ20B]

If you will need to cut a new keyway after boring the hub to larger I.D, that can be something to question as far as possible stress cracking at that point. Factors to consider are.....

- load: racing, towing, big boat? light boat? High horsepower and/or torque?

-Material: is it just brass or is it nibral?

-and Hub wall thickness, just to name a few.

The safest bet would be to find a local or nearest propeller service shop and let them determine based on the following points.

[Fastjeff57]

Agreed, but understand that the prop manufacturer has that in mind when they designed the prop for a range of shaft diameters, one inch being about the minimal for that size prop, and 1 1/2 around the maximum.

Jeff