Shaft length and my transom height
Posted August 23 2008 - 07:50 AM
I have ordered the Honda 50HP EFI, but I noticed that the sales person ordered the "long-shaft" version. I talked to the service guy, and he said that the engine comes in a short-shaft (15''), long-shaft (20''), extra-long shaft (25''), etc.
I have fairly low freeboard on my boat and the transom height is 20''. Does a 20'' shaft on an engine translate to a transom of 20''? Where is the shaft measured from on an outboard?
Posted August 23 2008 - 08:05 AM
For normal operation your engine's cavitation plate should be even with the bottom of the hull. A gap of 1-2" in either direction is acceptable and considered normal. If you are still unsure as to which shaft length your boat needs contact your hull's manufacturer. Your outboard owner's manual will also contain more information on shaft length and proper installation
Posted August 23 2008 - 08:58 AM
Posted August 23 2008 - 11:30 AM
Originally Posted by FlyByNight
I think that I am perfect. The old engine is 20'' and the transom is 20''. So the term "long" shaft should really be "nominal" shaft
You are good to go Andrew.
Posted August 23 2008 - 12:50 PM
Posted August 24 2008 - 12:15 AM
Originally Posted by Charleston
What shaft length do you use if your transom measure 18 or 19 inches or do boat mfgs make sure they dont.
The extra holes in the mount are for raising the motor if you need to.
Posted August 27 2010 - 10:12 AM
I just came into a new, heavily build small wooden skiff. I am painting it and stuff and looking around for an older 2stroke. The transom is 23" so I am trying to figure out if a long shaft, which is what I have been hunting for, would be right. Or if I should be looking for an extra long shaft? Or if I should be considering cutting down the transom to exactly 20"?
Another way of posing my question - Is it better to have the cavitation plate a little above the bottom of the boat or below?
I have included a picture of her. Not because I think it will generally help answer my query. But I just really dig her on account of her toughness and old school charm.
Thanks for any help advice or insights.
Posted August 27 2010 - 10:23 AM
something like this:
They are calling it a fixed jack plate.
Posted August 28 2010 - 07:46 AM
Posted August 28 2010 - 12:49 PM
Posted August 29 2010 - 06:40 AM
Posted August 29 2010 - 08:33 AM