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Old 16-04-2012, 19:05   #1
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Engine size

Hi, I am looking at a 41' yacht and another engine is partly installed. It is a MD2 Volvo which I'm told is 7.5 hp. The suggestion has been made that this is to small. Comments please.
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Old 16-04-2012, 19:16   #2
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Re: Engine size

Depends on the boat and usage, but I think it is way too small.
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Old 16-04-2012, 19:16   #3
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Re: Engine size

That really is much too small.......it'll move the boat, but just barely, throw in some wind or wave action and forget it.
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Old 16-04-2012, 19:22   #4
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Re: Engine size

Thanks Guess should have asked What would be recommended size?
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Old 16-04-2012, 19:22   #5
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Re: Engine size

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Originally Posted by kiwitrucker View Post
Hi, I am looking at a 41' yacht and another engine is partly installed. It is a MD2 Volvo which I'm told is 7.5 hp. The suggestion has been made that this is to small. Comments please.

Did you mean 7.5? Seven and 1/2? Yes, that's too small....
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Old 16-04-2012, 19:29   #6
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Re: Engine size

Is that really correct (7.5 hp)?? Depending on the boat a 41 footer should have anywhere between 35 and 65 hp motor. At least the ones I was looking did. 7.5 is way too small.
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Old 16-04-2012, 19:32   #7
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Re: Engine size

Not necessarily too small; how good are you at sailing? Or maneuvering in tight places under sail? My ten-ton cutter moves at five knots with an 8-hp four-stroke outboard. Chop and headwinds decrease speed dramatically, but it makes me less lazy about sailing, and so far I wouldn't change it if I could. One drawback is that docking can get exciting since throwing it in reverse does little to take way off the boat. Mostly I putter in at idle speed, and glide the last several hundred yards, occasionally giving it a burst of fwd or rev. as needed. 41' is ten feet longer than mine, though, with that much more windage.
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Old 16-04-2012, 19:49   #8
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Certainly NOT too small. No engine at all is not too small. Depends what you want to be able to do. You will not be motoring upwind in any kind of a blow with that.

The electric propulsion folks play in that low power realm.
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Old 16-04-2012, 19:53   #9
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Re: Engine size

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Not necessarily too small; how good are you at sailing? Or maneuvering in tight places under sail? My ten-ton cutter moves at five knots with an 8-hp four-stroke outboard. Chop and headwinds decrease speed dramatically, but it makes me less lazy about sailing, and so far I wouldn't change it if I could. One drawback is that docking can get exciting since throwing it in reverse does little to take way off the boat. Mostly I putter in at idle speed, and glide the last several hundred yards, occasionally giving it a burst of fwd or rev. as needed. 41' is ten feet longer than mine, though, with that much more windage.
The difference in weight between the a cape George 31 and the Cape George 40 is more then double. If there was any kind of wind you wouldn't be able to steer the boat in a straight line with a 7.5 hp engine.
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Old 16-04-2012, 20:14   #10
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Re: Engine size

Ok thanks. I just PM that MD2 volvo is 15hp Seller said 7.5. So anyone know hp of this engine?
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Old 16-04-2012, 20:20   #11
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Re: Engine size

Is this an old Penta Gas engine from the time before Volvo bought Penta?

Because the D1 and D2 are Gas engines that after starting also run on Petroleum. The Volvo D1 and D2 are Mitsubishi's Diesel.

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Old 16-04-2012, 20:27   #12
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Re: Engine size

No its a diesel. As I have been told MD2 is the marine version of theD2. Straight diesels
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Old 16-04-2012, 20:27   #13
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Re: Engine size

I'm no expert but a google search of "volvo MD2" looks like it's a 15.6hp engine. If it's a MD2B it might be a 25hp. Either way it's an old engine and a lot less than I would want on a 40ft'er. Parts might be hard to get,etc.. The 25 hp model might be ok depending on where you plan on going and how well boat/crew sails.
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Old 16-04-2012, 20:41   #14
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Re: Engine size

I agree, when its a late '60 engine its most likely to be a 15 hp. When you love old Technic its fun, else its a drama.
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Old 16-04-2012, 20:55   #15
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Re: Engine size

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Originally Posted by kiwitrucker View Post
Ok thanks. I just PM that MD2 volvo is 15hp Seller said 7.5. So anyone know hp of this engine?
Here is a snapshot from boatdiesel.com's engine database. Hope this helps.

And yes, 15 horsepower is way too small for a 41 ft yacht. I'm guessing it weighs over 18,000 lbs. I did a horsepower required calculator to determine how many horsepower it takes to push a boat that size, figuring on a waterline length of 36 feet and maximum speed of 6 knots. Here are the results:



In essence, you would need a 35.7 hp engine -- as 15 hp is required to push it, and your engine cannot deliver 15 hp continuously.

Hope this helps.
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