Will a 6HP inboard push my 4000# Quickstep? - SailNet Community

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  • 1 Post By TohatsuGuru
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Old 07-24-2011
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Will a 6HP inboard push my 4000# Quickstep?

My boat originally came with an 8HP 2 stroke motor. That was later replaced with a 4 stroke 8HP. The 4 stroke is much heavier than its 2 stroke predecessor. The motor sits in a well and so can't be tilted up to get it out of the water. At nearly 100 pounds, taking it out after each use is a veritable impossibility. At 60 lbs, a 6HP is much more manageable.
But, will it push the boat against a headwind?
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Old 07-24-2011
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A 6 will do the job well enough. As it won't cavitate as much as a transom hung motor the compromise in HP for weight savings is likely worth it. Just be certain to apply antifouling paint to the outboard's leg and prop so as to limit growth and drag. Frankly, I bet most Quicksteps have outboards smaller than an 8.
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Old 07-24-2011
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Quote:
Originally Posted by Quickstep192 View Post
My boat originally came with an 8HP 2 stroke motor. That was later replaced with a 4 stroke 8HP. The 4 stroke is much heavier than its 2 stroke predecessor. The motor sits in a well and so can't be tilted up to get it out of the water. At nearly 100 pounds, taking it out after each use is a veritable impossibility. At 60 lbs, a 6HP is much more manageable.
But, will it push the boat against a headwind?
A lot depends on your conditions. I had a Coronado 25, which also had a well, at about 4,500 lbs loaded with a 6HP 2 stroke. It was OK in calm conditions but in my opinion somewhat marginal for San Francisco Bay and outside ocean conditions. Changed to a 15HP 2 stroke, which was the same size and weight as a 9.9HP, and had all the power I could use. A 9.9 HP would have probably been enough? If you re-power suggest you get the longest shaft that will fit and a "high thrust" prop.

Dabnis
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Old 07-24-2011
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My boat is 5,000lb displacement and have a 4 stroke 5 hp. It slows a bit with a 20 kt headwind but I've got higher freeboard than you. Still makes decent way.
If you ever move where you have go to against a current, you'll need to bump up.
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Old 07-24-2011
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Depends on the gearing and the prop.
It's all about "thrust"!!
An 8" dia. prop with a 6" pitch
and your 6hp doing wot, you will punch through heavy seas and wind on the nose
with the best of anyone.

Dick
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Old 07-24-2011
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while I have no personal experience, met a couple in Oriental, NC on a 28ft Triton and they were cruising. They used a 6hp Tohatsu. They said it was enough for them on the ICW and sipped fuel. Hope that helps
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Old 07-25-2011
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Quote:
Originally Posted by Flybyknight View Post
Depends on the gearing and the prop.
It's all about "thrust"!!
An 8" dia. prop with a 6" pitch
and your 6hp doing wot, you will punch through heavy seas and wind on the nose
with the best of anyone.

Dick
IIRC, at the time I had my boat there were no "sailboat special" outboards with extra long shafts and high thrust props and gearing. I used the largest diameter prop with one inch less pitch than the stock prop. It worked fine, with the 15HP I ran mostly at about 3/4 throttle. Full throttle in high short chop pounded the boat pretty badly so I seldom did that. The important thing is to keep the prop in the water in rough conditions regardless of engine size.

Dabnis
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Old 07-26-2011
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The short answer is no, it is not enough power. That does not mean that it will not push your boat...It will. It just will not have enough thrust in heavy seas or going against a strong current or wind.
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Old 07-26-2011
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In the late 1960's we sailed a 26' Thunderbird displacing approximately 3800# out of Sausalito, Ca. Our Aux was a 1962 Evenrude "Angler" 6hp 2-stroke mounted in a well that proved quite adequate for our requirements under all circumstances.

FWIW...
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