Long or extra-long shaft? - SailNet Community
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Long or extra-long shaft?

I need to replace the inboard motor in our San Juan 7.7 with an outboard. I'm planning to order a Tohatsu 6 hp Sail Pro but can't decide whether to get the long (20") or extra-long (25") shaft version. The only downside that I can think of to getting the extra-long would be if it's so long that the bottom end of the motor hits the transom when the motor bracket is in the raised position. Might that be an issue? Are there other potential pitfalls?
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Re: Long or extra-long shaft?

I went from a long shaft to an extra long shaft engine on a Pearson 26 I owned many years ago. One issue I had was the extra long shaft would hit the back of the rudder under load. I had to adjust the shaft angle back a bit to stop that. However the extra long shaft was MUCH better at powering the boat in choppy seas as the prop stayed in the water most of the time.
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Re: Long or extra-long shaft?

So is the purpose of an extra-long shaft primarily to get the prop further under water? I was thinking that maybe getting an extra-long would allow me to mount the motor higher on the transom, thus allowing easier access for starting and shifting. In other words, the prop would be at the same depth whether using a long or extra-long shaft motor, with the difference being how high it is mounted on the transom.
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Re: Long or extra-long shaft?

Nope extra long shaft is to make sure the prop stays under water when there is a chop... less of an issue on an inland lake, definitely a problem in a seaway.

For the record I use a Long shaft on my S2 7.9 (26 foot)... works fine on a lake (and for the prior owner on Lake Michigan)... but I honestly think it'd be better as an extra long, as even in 1-2 foot waves, it cavitates some.

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Re: Long or extra-long shaft?

We recently purchased an extra-long shaft for a 22' boat on an inland lake. The lake does pick up quite a bit of chop when the wind is from the south, and having the extra length made a big difference for us. We had previously tested a long shaft and it would come up out of the water when the chop was around 1-2'

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Re: Long or extra-long shaft?

Can attest to that also. I have a long shaft that's mounted in the well on my Ex26, and in heavy weather, the stern rising will lift right out, and I lose momentum. That extra few inches would certainly make headway a bunch easier in chop like that.

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Re: Long or extra-long shaft?

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Originally Posted by clip68 View Post
We recently purchased an extra-long shaft for a 22' boat on an inland lake. The lake does pick up quite a bit of chop when the wind is from the south, and having the extra length made a big difference for us. We had previously tested a long shaft and it would come up out of the water when the chop was around 1-2'
clip68, could you tell me about how far underwater the anti-ventilation plate of your extra-long motor is under normal operating conditions?
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Re: Long or extra-long shaft?

It is around 10" - 12" or so below the water in flat water. That is with my setup. I expect it will vary depending on your transom and motor mount.

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Re: Long or extra-long shaft?

This is the long shaft on my S2... ventilation plate is about 6 inches underwater. It sits lower when my fat keester is driving.



and we just tilt it out to race. Extra long shaft would have been better.

"Rum Line" an S2 7.9 - cheap, fast, trailerable, and paid for.
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Re: Long or extra-long shaft?

I recently bit the bullet and ordered a Tohatsu 6 hp Sail Pro with extra-long shaft. I already have a Garelick 71056 mounting bracket, not yet installed. The bracket's installation instructions would result in the motor's anti-ventilation plate being 2" underwater. I'm considering using the 5" of extra shaft length by sinking the plate 3" deeper, resulting in the motor being 2" higher up on the very tall transom. Thoughts?
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