Motor Sailing

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John N.

I have been motor sailing my H34 for the past few weekends in the Chesapeake Bay! I have been averaging about 40 miles per day! I keep the engine at about 1800 RPM's and also the sails. I can average about 5.5 knots and sail much closer to the wind! Does anyone know if this will cause a problem my my Yanmar? I would also invite any other comments on Motorsailing!
 
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Ron Hughes

Motorsailing

John, it sounds like you are having fun w/your 34! The fact that you are easing the load on your yanmar should cause no problems as far as I know. I might add though, that the two Seattle area Yanmar gurus that the Hunter Assn. of Puget sound (HAPS) had at their big rendezvous last July told us that you should run your engine at very near full throttle for 15 or 20 mins. after it is good and warmed up. Over time, this eliminates all carbon build up and promotes the general good health of your engine. Our 50 horse Yanmar is now running with no smoke whatsoever after just a couple of months of this new practice. Back to motor-sailing. If you can use both sails, you are undoubtedly in a fair amount of wind. Did you know that if there is little or no wind you can motor sail very effectively? All you do is hoist the main only, move the traveller car as far toward the wind as is reasonable, and sheet in until you have a good shape in the main as you motor. The faster you motor, the more the sail helps you! You should see a 1-2 kt. increase in your cruising speed. Your fuel usage will drop over a given distance as you will go further in the same time at the same rpms. And as an addede benifit, your boat will be much more stable in a seaway! I hope that these thoughts improve your sailing experience as they have mine. Ron Hughes s/v Best Revenge(40.5), Portland, OR
 
Dec 2, 1999
15,184
Hunter Vision-36 Rio Vista, CA.
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John: Just to reiterate what Ron said. Be careful with running the motor at low RPM's for extended periods of time. The Yanmar 2GM/3GM have a tendency to coke up the mixing elbow when they are run at low RPM's. Yanmar recommends running them a 70-80% of max rated RPM's (3600) to prevent this coking problem. You may want to check with Mack Boring regarding this procedure and get their recommendations.
 
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Paul Akers

Mack Boring says...

I spoke with a Mack Boring rep at the Newport show last week and he said that the engines should be run, under load, at a higher rpm in order to get the soot out. If you run to charge your batteries, or idle while sailing, coke will build up and must be blown out. I've been starting to get smoke lately and was concerned because I did both of these this a lot this season. Plus I usually motor around 2200rpm (5kt) On my 3HM (1988), I should motor at least 2500rpm to keep it clean. This past w/e I motored 25mi (no wind) and already see a difference.
 
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