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  #11  
Old 08-22-2013
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Re: what kind of headwind should a sailboat be able to motor through?

Hey,

30 kts of headwind is a lot of wind (and wind driven waves). And every kt you go forward increases the apparent wind. While the smoke is not normal, I think your performance isn't that far off. If you need to move ahead in 30 kts of wind you are going to have a hard time of it. IMHO you would be better off putting a LITTLE sail (double reefed main and small jib), bear off 40-50 degrees and motorsail your way tacking upwind.

Good luck,
Barry
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  #12  
Old 08-22-2013
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Re: what kind of headwind should a sailboat be able to motor through?

I'm with Barry on this. I can't see that it's necessary to head straight into oncoming wind. even without sails just a slight tack to starbd or port will cause the boats hull windage to help it move forward.
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  #13  
Old 08-22-2013
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Re: what kind of headwind should a sailboat be able to motor through?

was current with or against you..
the carbon sounds like our bash before my runaway diesel problem due to fuel delivery issues inclusive o f injector pump
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  #14  
Old 08-22-2013
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Re: what kind of headwind should a sailboat be able to motor through?

Quote:
Originally Posted by CanadianNorth View Post
The sea state was choppy, but only a mile from land with offshore winds, so not bad. No tide to speak of.
Hull and prop were clean when she went in the water 7 weeks ago.
Service history is unknown. Last two previous owners cared for the boat well - for what that's worth.
I have owned the boat two months. Previous she was on the hard 2-3 years. Its a 1979 15 HP yanmar. I changed oil, oil filter, fuel filters, new exhaust elbow (long story). Some fuel was in The tank. I had thought I drained it all, but have since run 10 gallons through.
Tank is old, no doubt. And may be an issue.
It sounds to me like the prop is too aggressive. Determine the max rpms the engine will do, whether that is a real-life test in neutral or referencing the manual. Next get it out in calm seas and get her in gear. If you have the right prop it will progress towards redline, more slowly as it gets close, finally holding steady around 200 rpm below redline. If it never comes close to redline the prop is too aggressive. If it shoots up to redline, it's not aggressive enough.
Good luck! ~LL
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Old 08-22-2013
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Re: what kind of headwind should a sailboat be able to motor through?

How does she start? Ease of starting tells you a lot about the condition of the engine- hard starting with lots of smoke? Stem seals, coked up valves, head gasket, or piston rings.

you should be able to get higher revs than you are getting. as noted earlier, you are at least 500 rpm's low. Start with the cheap, easy stuff- you might want to give the lines a good bleed, and change the filter. Adjust the valves. clean the injectors. retorque the head. Get the basics out of the way before looking to the prop, etc.
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Old 08-22-2013
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Re: what kind of headwind should a sailboat be able to motor through?

Two comments.

1. I'm with Barry that trying to motor into 30+ knot winds is not going to work.

2. If you can only make 5 knots in calm weather, something is not right. I would think 5.5 to 6 knots would be more like it.
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Old 08-22-2013
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Re: what kind of headwind should a sailboat be able to motor through?

Quote:
Originally Posted by deniseO30 View Post
I'm with Barry on this. I can't see that it's necessary to head straight into oncoming wind. even without sails just a slight tack to starbd or port will cause the boats hull windage to help it move forward.
Narrow, winding channel with lots of shallow water around.
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Old 08-23-2013
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Re: what kind of headwind should a sailboat be able to motor through?

Quote:
Originally Posted by CanadianNorth View Post
---
What length is your boat ?
40' Norman Cross trimaran
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Old 08-23-2013
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Re: what kind of headwind should a sailboat be able to motor through?

Yup, thirty knots and my main is reefed, and some headsail. Way more horsepower that way.
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Old 08-23-2013
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Re: what kind of headwind should a sailboat be able to motor through?

Thanks for the replies.

I'm making my way along the coast of newfoundland to a cabin only 40 knots away. There are several long fjords(5 miles long , less than a mile across) with wind directly down them.

From cold, the engine smokes black when starting and takes 20-30 seconds to start. Once warm she starts no problem .
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