We have used the Lovejoy coupling for many applications. They are available at most marine and hydraulic suppliers.
http://www.lovejoy-
There are many variations on this design based on the power transfer requirements of a particular application. I think you will find the coupling you have chosen is designed for around one horsepower and very minimal instantaneous torque. With the end load being a fluid, (prop to water) you will only be concerned with the inertia of the propeller. I would not bother with the broaching and using a key. Just a few tacks with a welder will carry a far greater load than the flexible cross, no matter what material you choose.
Another simple, very inexpensive alternative is two sprockets and a wrap of double row chain. Weld a plate sprocket to the outboard shaft and us a hub sprocket on the motor. You can use SS chain if you want it to last 100 years instead of 20.
Please let us know how many hours the composite cross lasts in this application?
Thanks;
Reid
--- In electricboats@
>
> Mark,
>
> Coupler.
>
> Most bearing supply stores or industrial supply stores sell them. You buy
> the parts individually each hub for the shaft you are trying to mate to.
> The star comes in a variety of materials depending on conditions they will
> have to live in.
>
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