Outboard for use on tender and sailboat - SailNet Community
 
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post #1 of 5 Old 12-23-2010 Thread Starter
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Outboard for use on tender and sailboat

I would like to purchase an outboard for my sailboat that I can use with my inflatable tender. Should I go for a long or short shaft?
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post #2 of 5 Old 12-23-2010
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You will need a long shaft (at least 20" there are some 25") for the sailboat and 4 Hp will work fine with a High Thrust prop

It will move the tender but be to deep in the water for the best performance

And posting one time will work

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post #3 of 5 Old 12-23-2010
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The long shaft has a larger prop and lower gearing. On a tender the long shaft outboard engine will over rev. If you do not plane the tender, you will be OK or maybe you can get by if not full throttle. Also consider that switching the outboard from sailboat to tender and back while on the water would likely result in engine overboard. Better have some diving equipment with you, oil and a way to get the spark plug out. You cannot wait more then a few hours to get the outboard running after submersion or corrosion will ruin the engine. You have to get the engine running in that time.
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post #4 of 5 Old 12-23-2010
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Over reving the engine causes excess wear or could even put forces on the engine that would cause elongation of the bearing race on a connecting rod or some other part. These forces increase by the square of the engine speed. For instance the forces are four times as great at 4000 revolutions per minute as at 2000.
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post #5 of 5 Old 12-23-2010
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Unfortunately, the dinghy requires a short/normal shaft and the sailboat requires a long/extralong shaft as a general rule. Using a single outboard between the two will leave it a bad fit for one of the two purposes.

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