Here is another relatively low cost way to make a shaft coupling.
Our gear boxes need shaft couplings on the prop shaft and prop
flange and between input shaft and sun gear. I call it the "Pin"
shaft coupling.

This is the one we are using on the 650 HP Racing Beat time to climb
engine between the rubber coupling and the Bell 47 GB sun gear.
As you can tell it works with dissimilar metals. In our case
billet aluminium rubber coupling and the steel sun gear input
shaft. Takes an NC mill to make the parts accurately or a very
good rotary table in a drill press. The pins 3/16 hardened steel.

This gear box combination is good for 1000 HP if we need a turbo 3 rotor
to dominate the Reno sport class racing if we can come up with the needed
money :-)

John Lynch came up with this idea and made the parts.

Paul Lamar

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