I am looling at replacing my solid original tranny-to-prop shaft coupler with either a drive-saver / R&D type "disk", or a flexible jaw type coupling like the lovejoy (see link below):
The lovejoy jaw coupling, with a 1" shaft is rated for up to 18hp / 318 inch/lbs torque. My Yanmar 2gm
is rated for approx 15 hp, and 25 ft/lbs torque, at the crankshaft!!! I have a 2.62 / 1 reduction tranny, so would that mean that I have 2.62 times 25ft/lbs = 65.5 ft/lbs of torque at the shaft???? If so, then multiplying by 12 to get inch/lbs would = 768inch/lbs, which would be almost double the rating on the Lovejoy unit.
Am I calculating correctly - just want to see if the Lovejoy would work!! It is only $57!
A retired commercial marine
guy told me to get an SKF coupling, but I beleive that is the company name, and i can't find a model for sale
He sid it was a rubber centered flexible coupling.