1978 O'Day 30' prop question

Tally Ho · Feb 28, 2018

Best bet would be to contact a prop seller and give the specifics on you boat and engine. They can tell you the correct size of prop. Pitch, etc..

Greg

Ben Jammin · Feb 28, 2018

Does your engine happen to be a YSM12? I just purchased a West by North Campbell Sailor LH 3-blade fixed prop for my 1979 Hunter 30 with the YSM12 (http://www.westbynorth.com/). Unfortunately I've been having engine issues and haven't really been able to try it out. I posted a similar question to yours on the Hunter Owner's forum and got several recommendations for this prop. I spent close to $600 including shipping, and they were able to make it in a few weeks. Supposedly it's an excellent combination of good thrust, low propwalk, and low drag. I will say that I still have significant propwalk. Like Greg says, if you call them and give them your engine info they figure out a good prop. And if it doesn't work well they can re-pitch it (of course you have to send it to Canada, and I think there's a fee for re-pitching). I filled out the online request with all the info I knew, then called the next day.
By the way, if I can find a decent 2GM20 I might be interested in selling a very lightly used left-hand prop...

Ben

Ben Jammin · Feb 28, 2018

Here's a link to my thread on the topic. Some of the feedback I received might also be helpful for you:
https://forums.sailboatowners.com/i...ith-yanmar-ysm12-prop-recommendations.189658/

Tom Hughes · Aug 8, 2018

Meis said:
I have recently purchased a 1978 30' O'Day with a recently rebuilt 12HP Yanmar marine diesel engine. Looking to change from 2 blade fixed to three blade prop. Any insight on what I need to look for? Current prop vibrates and gives very little push. Just need a bit more thrust with the small engine. Ideas?

Did you ever determine the correct prop for your ODay 30? We have a 78 Oday 30 with a YSM 12 as well. Ours came with a 3 blade fixed and I suspect it is too much prop for the boat. We get black soot at high rpm and or under heavy sea, and I’m lucky to get 5 knots of boat speed at full throttle in flat water.

odaydokay · Aug 8, 2018

Key is determining what was original. The 28 with a Universal M-12 engine is two blade and pushes it faster than 5, closer to 6 at full throttle. I don't get smoke until at full or briefly when accelerating. At 80% throttle no smoke. Often well meaning experiments with non original props work out badly, so my view is caution on this subject.

Tom Hughes · Aug 8, 2018

Thanks, I agree on the non original prop. Unfortunately I am the victim of a previous owner. The 30 came stock with a 2 blade fixed and I bought the boat with a fixed 3 blade, so it has already been changed. I’ll do a little more research and see if I can find the correct size and pitch, worst case I’ll ask the professionals. I was hoping someone already had the answer.

odaydokay · Aug 10, 2018

Rudi at D&R might have access to that info as he was the parts manager for O'Day. If not, he can probably send you to someone with the info and the prop.