Evinrude outboar Short shaft vs Long shaft

[Pintail23]

Alright guys, I have a few questions. To start with, how do I tell whether or not I need a short shaft or long shaft. I talked with a guy a few days ago and he told me that if you measure on the transon, from where the motor mounts to the lowest point-15" to 17" then a short shaft is needed. If it's 20"-22" then a long shaft is needed. Is this correct? What does he mean by the lowest point? The lowest poing on the transom or the boat it self? On the bottom of the boat there are ribs, that are riveted on. Does he mean to the lowest point of those? My boat measures 15" from the top of the transom to the lowest point on the transom, does that mean I need a short shaft motor? And, will having a long shaft make a difference or cause problems?

As of right now, I have a 6hp( what im assuming is a long shaft) motor. I'm looking to upgrade to a 15 horse but not sure what to get. From where my motor mounts to the transom to the bottom of the prop is 28" Is that how to measure for shaft lengths or is it to just above where the prop starts?

Any help is greatly appreciated!

Brandon

 

[boobie]

Re: Evinrude outboar Short shaft vs Long shaft

If your transom measures 15 inches you need a short shaft mtr. Putting a long shaft on it you'll get a lot of spray and no performance.

 

[JB]

Re: Evinrude outboar Short shaft vs Long shaft

Yeah. What Boobie says.

The distance that you measure on the outboard is from the inside of the transom clamp to the anti-ventilation plate. That is 20", +/-, on a long shaft outboard and 15", +/- on a short shaft..

 

[rwilso]

Re: Evinrude outboar Short shaft vs Long shaft

This site should answer your question http://www.onlineoutboards.com/Help.html?Question=Shaft-Length

 

[1946Zephyr]

Re: Evinrude outboar Short shaft vs Long shaft

To answer your question, the place on the boat to measure is from the transom center, to the keel of the boat. That would put you dead center on the rear of the boat. Ideally, you want the cavitation plate on the motor to be even with the keel or no more than 2 inches below it.