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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Outboard Shaft Length		  New Topic  Reply to Topic
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JanS48
Navigator

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USA
146 Posts
Initially Posted - 09/10/2026 :  22:16:24  Show Profile  Reply with Quote
Hi everyone, on my C25 I have a Honda 9.9 with an extra long shaft. I'd like to replace it with a an older Honda 7.5 which has very low hours on it but it's just a long shaft, not extra long shaft. From the clamp to the plate above the prop measures 23 inches on the 7.5
Is that going to be long enough ?
I know originally when I got the boat it had an 8hp Nissan 2 stroke long shaft but I never used it.
Thoughts ?
82 C25 SR FK
Sailing out of Newport Harbor.

Steve Milby
Past Commodore

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USA
5933 Posts
Response Posted - 09/11/2026 :  09:49:02  Show Profile  Reply with Quote
I'm not 100% sure, but you want it to be long enough so that the cavitation plate stays submerged all the time. One way to test it is to put a person weighing about your weight on the bow of the boat. That will lift the transom. Then measure down 23" from the top of the motor mount. If the end of your measuring device is about 3" under water, I think it would be sufficient at least on an inland lake. If you get into bigger, choppier waters, I think you need the longest shaft you can get. If it's less than 3" it's likely that the prop might lift out when motoring while someone is working on the bow.
Steve Milby J/24 "Captiva Wind"
previously C&C 35, Cal 25, C25 TR/FK, C22
Past Commodore
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.