Many folks are confused by what the motor manufacturers refer to as "shaft length"or "do you have a long shaft or short shaft motor?"
While this is often coded into serial and model numbers often it has been changed to a different length or not noted.
Sometimes when you order or purchase parts your motor length will be necessary to obtain the correct parts.
So maybe this little diagram will help clear things up a bit, and maybe even help when your seeking a little newer outboard for the old boat.
You can see how simple it is to measure from the top of transom on your boat down to the bottom, or pad to get an idea what motor length you need.
You may not get an exact 15, 20, or 25 inch measurement but it will be within an inch or so.
The difference being hull designs and transom angles etc. but you will understand what length motor the manufacturer designed your hull to perform best with.
Now you'll be all set to motor on over to where those fish are without destroying a prop in the propcess; Whoops, I meant process.
What I really meant is.....
"Go Catch Em Y'all"