Com-Pac Yacht Owners Association

Com-Pac Model Specific Discussions => CP-23's => Topic started by: Tbeeman on March 12, 2014, 11:23:20 AM

Title: Shaft length
Post by: Tbeeman on March 12, 2014, 11:23:20 AM
20" vs 25"  anyone have a recommendation?? looking at a 9.9 Honda. Thanks.
Title: Re: Shaft length
Post by: brackish on March 12, 2014, 04:59:09 PM
If you do a search in this forum section on "outboard motor" you will find many discussions on this issue.

I had a 9.9 HP, 20" shaft, 4 stroke, electric start, 104 lb. motor.  It came with the boat.  I swapped it for a 6 HP, 25" shaft, 4 stroke, 59 lb. Sail pro.  It has worked out very well, however the shaft length was not the issue, the 20" worked fine.  It was the weight.
Title: Re: Shaft length
Post by: Bob23 on March 12, 2014, 04:59:38 PM
25. I have a Nissan 8 hp 20" shaft which works fine most of the time but in waves it will cavitate a bit.
Bob23
Title: Re: Shaft length
Post by: BruceW on March 12, 2014, 05:10:41 PM
Bob, curious about your cavitation. What size waves would cause that?

The reason I ask is I need to do something with my motor mount eventually; either put in a spacer at transome, or move it back up to where it was before OP moved it.
Title: Re: Shaft length
Post by: MKBLK on March 12, 2014, 05:48:28 PM
tigersailor - As the owner of a "new" 1977 Johnson 2hp that I haven't even started yet, I now feel expert in the field of outboard motors... ha, ha.

Seriously, I just got my Johnson (don't even think it!) and it has a long shaft that measures 25 inches from beneath the housing to the bottom of the prop. On the CP16 it reaches very nicely below the hull bottom. I don't think you'd want anything shorter.

Marty K.
Title: Re: Shaft length
Post by: BruceW on March 12, 2014, 07:20:03 PM
haha, well, I do have the Sailpro; but you know the 25" has to start somewhere. I'm trying to figure out where it needs to be.