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Old 01 November 2007, 16:35   #1
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Implications of shaft being too long?

I have a small 3m inflatable tender that planes nicely with my 3.5HP short shaft. Problem is that it wont plane with 2 people in it.

So i've found a nice 6HP for it (boat can take upto 10HP) but it's a long shaft. Is there any drawbacks as to putting on a long shaft engine? Apart from it sitting in the water and more chance of hitting something... any safety or performance issues??
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Old 01 November 2007, 16:45   #2
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For that size don't worry about it you should be fine. I had a 2.6m inflatable once that we used to put a 6hp longshaft Johnson on and it ran fine - would plane easily with 2 people. You might get a bit of spray if your unlucky but thats about it.
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Old 01 November 2007, 18:28   #3
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Have you tried googling " Shaft too long for inflatable " ?
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Old 01 November 2007, 18:32   #4
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Quote:
Originally Posted by prairie tuber View Post
Have you tried googling " Shaft too long for inflatable " ?
Nice

Tim - Thank's for the reassurance. I would prefer a short shaft (run in shallower water etc) but i've spotted a nice 6HP for sale, just wanted to make sure I wasn't going to be wasting my time.
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Old 01 November 2007, 19:29   #5
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Implications of shaft being too long?

Alt

Have a look here http://www.ribs.co.uk/page/choose_motor
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Old 01 November 2007, 19:36   #6
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Derrick - Thanks for that.

Quote:
Will the wrong shaft length work on my boat ?

NO! Short shaft on a long transom may not even reach the water, water flow and cooling will be affected and performance will be dreadful. Long shaft on a short transom is dangerous. The point of thrust is way to low in the water and in the case of say 8 hp opening the throttle may flip a small boat over.
So I can try backflips? Woohoo!!!
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Old 02 November 2007, 15:42   #7
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Have you tried googling " Shaft too long for inflatable " ?
That sounds like some of the spam I've been getting...


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