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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


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Old 01-28-2001
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jimhuggins is on a distinguished road
In Gear

I recently bought my first sail boat with a diesel inboard auxillary engine. The boat is a Pearson 36 with a 30 H.P. Yanmar. After hoisting the sails is the transmission supposed to be left in neutral or in forward gear while sailing? I have reviewed the boats manual and the engine manual and neither one mentions the issue. I have also heard opposing view points from a few other sailors. Is there a right way and if so why.
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Old 01-29-2001
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bappelbe is on a distinguished road
In Gear

Hi
I put it in gear, but this is because I have
a folding prop that tends to "unfold"
otherwise, I am sure it doesn''t matter that
much.
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Old 01-29-2001
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In Gear

I am the previous owner of a C&C 30 with a 2GM20 Yanmar engine. I actually does matter; some transmissions are not meant to free wheel. This was the case with my Yanmar. Actually, I believe that they suggested that you put the engine in reverse to lock the shaft. If you don''t have you manual, call a Yanmar dealer. A locked shaft is good both for your engine and for your performance under sail.
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Old 01-29-2001
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In Gear

Yes, put it in gear. Reverse is probably best but never let it freewheel.
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Old 01-29-2001
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In Gear

Spoke with Yanmar Dealer at 2 Boat Shows.
They both say it is alright to freewheel because the shaft inside spins up the oil.
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Old 01-30-2001
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In Gear

A freewheeling prop creates more drag that a locked shaft; leave it in gear while you are sailing!
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Old 01-30-2001
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In Gear

Ive been racing for sometime and have tested with the free wheeling prop and locked. I have found freewheeling gives me more speed....Think about it....a fan in a room and a breeze blowing in the window. If fan free wheels the breeze blows in unobstructed as it turns the fan...with it locked it will prevent breeze from coming in, stops flow.
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Old 01-30-2001
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In Gear

Depends on the prop. A folding prop will offer less resistance when the shaft is locked. No question about that.
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Old 01-30-2001
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In Gear

A folding prop definitely has less resistance
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Old 01-30-2001
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In Gear

As for the fan analogy; aeordynamics and hydrodynamics, while similar, are two very different mediums. I will try to find the article, however, a free wheeling prop does not necessarily offer less resistance than a locked shaft.
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