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  #1  
Old 08-01-2012
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6hp Saildrive or 8hp regular?

I've got a 24' sailboat (about 3500 lbs) that is currently powered by an 8hp Evinrude 2 stroke. For a bunch of different reasons I'm considering replacing the 8hp with a newer model. At first I was looking at the Honda 4stroke 8hp, but came across a nice deal on a Tohatsu 6hp Saildrive with an extra long shaft.

I understand that the general rule is about 1hp per 500 lbs, so that would suggest the 6hp will be a little underpowered, but I'm curious what difference the high thrust prop on the Saildrive model will make. I also like the appeal of the extra long shaft in a chop, as my current motor will bob out at times. Other advantages of the 6hp is a much lighter weight and a fair bit less expensive, but that will be little consolation if I find myself underpowered when I need it most.

Any thoughts on whether the 6hp Saildrive will work, or if I should stick with an 8hp or even a 9.9?
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Old 08-01-2012
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6hp Saildrive or 8hp regular?

Years ago I had a long shaft 4.5 hp johnson powering a 23' sovereign sloop with a total wt of 3500 and it did just fine powering the boat, even in chop. I bet the 6 hp will be sufficient unless you frequently need to run against really strong currents.
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Old 08-01-2012
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6hp Saildrive or 8hp regular?

I had a Johnson 6 hp on an oday 20 with a standard prop. It seemed quite under powered. I did a little research and found out they offered a different low pitch larger diameter prop for using it as a trolling motor on a heavy power boat. That prop made a huge difference and I was very pleased with the motor after that. In reality a 6 hp motor with a very large very low pitch prop could push a large boat even against high winds, but at a very slow speed.
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Old 08-01-2012
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Re: 6hp Saildrive or 8hp regular?

I had a Coronado 25 at about 4,500 lbs with a 6HP 2 stroke which was OK in calm conditions but in San Francisco Bay with strong currents and steep high chop it struggled at times. Went with a 15 HP 2 stroke, which was the same size and weight as the 9.9HP, and it was plenty. On both motors I went with a one inch less pitch prop which worked fine. If your 8HP has more thrust than you need the 6HP may be OK? Don't know your sailing conditions but when things get nasty it is nice to have extra power. I have a 6HP Tohatsu with the lowest pitch prop on a 750 lb Jon boat and at 6,000 feet elevation it will run at 10.5 MPH on a plane. It runs perfectly. I think about the only way to really tell if 6HP is enough is to try one?

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Old 08-01-2012
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Re: 6hp Saildrive or 8hp regular?

I have the Tohatsu 6hp 20" long shaft with hi thrust prop on a 27 foot 3800 lb boat. It is ideal
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Old 08-01-2012
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Re: 6hp Saildrive or 8hp regular?

The HT prop is what makes the motor work and 6 HP is plenty as in the old days the prop was real a really bad two blade

The 6HP is singel cylinder with vibration VS the two cylinder 8 HP units which are much smother




Seafever 29' 8000# ++ was broken down in NYC and i had to bringe it out to glen cove over 16 miles which the 4HP did at 4.5 knots

Now the boats all happy and the A4 will push it to 6+ but the stern squat is so bad 5.5 knots is pretty much the speed unless you like standing in water
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Old 08-02-2012
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Re: 6hp Saildrive or 8hp regular?

i have a 6 hp tohatsu saildrive on my spirit 23 with the throttle barely cracked it will do 5mph according to the gps .
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Last edited by Southron Spirit; 08-02-2012 at 08:29 PM.
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