Using sails to crank the engine - SailNet Community
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post #1 of 13 Old 10-10-2013 Thread Starter
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Using sails to crank the engine

I dont know if this'd work or not but on my 28' S2, if I am in gear and under sail, the prop turns.
So, would it be possible to open the compression levers, get going well under sail, watch the prop spinning the decompressed engine, throw the compression levers in and start the engine?
In reality, my cruising method of starting my engine with weak or nearly dead batteries is:
Relieve compression
Crank a few times to coat cylinders with lube
drop in one lever
then drop in the second lever as she tries to start.

If that doesn't work, time for my secret weapon, the new spare charged battery I keep in a difficult to access spot. I have to dig it out and connect it. I fully charge it a couple times a year and then put it away.
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post #2 of 13 Old 10-10-2013
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Re: Using sails to crank the engine

Your prop shouldn't turn if the transmission is in gear.
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Re: Using sails to crank the engine

if it did work wouldn't it start the engine going in the wrong direction?
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post #4 of 13 Old 10-10-2013
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Re: Using sails to crank the engine

You may have to wrap a line around the prop shaft, tie it to the boom... Gybe as you turn the key for the fuel pump to start....

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post #5 of 13 Old 10-10-2013
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Re: Using sails to crank the engine

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Originally Posted by deniseO30 View Post
You may have to wrap a line around the prop shaft, tie it to the boom... Gybe as you turn the key for the fuel pump to start....
"CONTACT!"

Btw if your prop shaft turns in gear you may be doing damage.. Hurth specifically forbids sailing with gear in fwd position. I think it's to do with lubrication issues if the motor is not turning the input shaft.

Ron

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".. there is much you could do at sea with common sense.. and very little you could do without it.."
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post #6 of 13 Old 10-10-2013
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Using sails to crank the engine

I've read that the "bump start" technique is as follows:

1. Achieve as much boat speed as possible under sail. Transmission in neutral (prop will be spinning freely)

2. Perform all normal pre-start procedures. If batteries are low (not dead), crank the engine and "bump" the transmission into gear.

2b. If the batteries are totally dead, then compression levers release, transmission in forward gear, the drop the levers. Must ensure fuel flow if battery is dead (e.g. Lift pump requires power).

Disclaimer: I've never tried either of these

Josh
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post #7 of 13 Old 10-10-2013
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Re: Using sails to crank the engine

Allright! That's it! Pull over I'm driving . . . .
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Re: Using sails to crank the engine

BTW, I actually read somewhere (unless I dreamed it) that Yanmar says to put your engine in reverse when under sail alone. I cannot remember where I read this. I do have the Yanmar service manuals and it isnt in there.
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Re: Using sails to crank the engine

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Originally Posted by Frogwatch View Post
BTW, I actually read somewhere (unless I dreamed it) that Yanmar says to put your engine in reverse when under sail alone. I cannot remember where I read this. I do have the Yanmar service manuals and it isnt in there.
Actually there's a most emphatic Yanmar bulletin saying NOT to sail with the gear in reverse.

Quote:
Advisory Number: MSA08-003:

DATE February 8, 2008 Dealers and OEMs
TO: All Marine Distributors
SUBJECT: Gear in Neutral While Sailing All MODELS:

All Sailboat Engines

We continue to get questions regarding the correct gear position while sailing with the engine OFF. This advisory is issued as a reminder; Yanmar requires that if sailing with the engine OFF (not running) the transmission shifter must be in the neutral position or internal damage to the gear or sail-drive will result. This damage will not be covered by Yanmar’s Limited Warranty. Please instruct customers and dealers who deliver the sailboat to the customer, of the correct (Neutral) position for the marine gear while sailing.

If the customer desires that the propeller shaft not spin while sailing, either a folding propeller, shaft break, or other suitable device may be used. However, Yanmar accepts no responsibility for the selection, installation, or operation of such devices. Please also refer to Marine service advisory “MSA07-001_Yanmar Sail Drive Propeller Selection” for additional information.

If you have any questions regarding this advisory please contact a Customer Support representative.

Ron

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".. there is much you could do at sea with common sense.. and very little you could do without it.."
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post #10 of 13 Old 10-11-2013
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Re: Using sails to crank the engine

Back in the day we used to tow start the fish boats. But big wheels and low compassion gas engines.I've heard of sailboats accidentally starting while surfing off big waves in the southern oceans. Shaftlocks the cure Some gear boxes will overheat if left in gear because circulating cooling oil pump runs on the foreward shaft ( engine driven)(Borg Warner) Neatest shaft disconnect I've ever seen was made from logging truck tranny parts. the top gear syncro ring and shaft allowed dog clutch like actions so prop shaft could be free spin or power takeoff. Passing Cloud.
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