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16-04-2012, 18:05
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#1
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Registered User
Join Date: Apr 2012
Location: Saskatchewan Canada
Boat: Colvin Gazell 50'
Posts: 51
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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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16-04-2012, 18:16
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#2
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Registered User
Join Date: Sep 2009
Location: Halifax Nova Scotia Canada
Boat: Douglas 32
Posts: 30
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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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16-04-2012, 18:16
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#3
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 9,626
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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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16-04-2012, 18:22
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#4
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Registered User
Join Date: Apr 2012
Location: Saskatchewan Canada
Boat: Colvin Gazell 50'
Posts: 51
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Re: Engine size
Thanks Guess should have asked What would be recommended size?
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16-04-2012, 18:22
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#5
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cruiser
Join Date: Aug 2011
Location: Tampa Bay area
Boat: Hunter 31'
Posts: 5,731
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Re: Engine size
Quote:
Originally Posted by kiwitrucker
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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Did you mean 7.5? Seven and 1/2? Yes, that's too small....
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16-04-2012, 18:29
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#6
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Registered User
Join Date: Mar 2012
Location: San Jose, CA / Blaine WA
Boat: 1987 Hughes H40 Ketch
Posts: 35
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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.
__________________
-----------------------------
Jim & Paula
s/v Althea - 1987 Hughes H40
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16-04-2012, 18:32
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#7
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Marine Service Provider
Join Date: Dec 2010
Location: Little Compton, RI
Boat: Cape George 31
Posts: 2,962
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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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16-04-2012, 18:49
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#8
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Registered User
Join Date: Dec 2009
Posts: 2,959
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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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16-04-2012, 18:53
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#9
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Registered User
Join Date: Mar 2006
Location: Nevada City. CA
Boat: Sceptre 41
Posts: 3,857
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Re: Engine size
Quote:
Originally Posted by Benz
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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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.
__________________
Fair Winds,
Charlie
Between us there was, as I have already said somewhere, the bond of the sea. Besides holding our hearts together through long periods of separation, it had the effect of making us tolerant of each other's yarns -- and even convictions. Heart of Darkness
Joseph Conrad
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16-04-2012, 19:14
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#10
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Registered User
Join Date: Apr 2012
Location: Saskatchewan Canada
Boat: Colvin Gazell 50'
Posts: 51
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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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16-04-2012, 19:20
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#11
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cruiser
Join Date: Feb 2012
Location: São Luis, Maranhão, Brazil
Posts: 223
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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.
CeesH
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16-04-2012, 19:27
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#12
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Registered User
Join Date: Apr 2012
Location: Saskatchewan Canada
Boat: Colvin Gazell 50'
Posts: 51
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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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16-04-2012, 19:27
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#13
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Registered User
Join Date: Dec 2007
Location: Grand Cayman
Boat: Lavranos 39 S/v Continental Drift
Posts: 88
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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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16-04-2012, 19:41
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#14
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cruiser
Join Date: Feb 2012
Location: São Luis, Maranhão, Brazil
Posts: 223
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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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16-04-2012, 19:55
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#15
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Registered User
Join Date: Mar 2012
Location: Sacramento, CA
Boat: Bayliner Victoria 2750
Posts: 314
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Re: Engine size
Quote:
Originally Posted by kiwitrucker
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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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.
__________________
Ed & Lindsey - Sacramento, CA
1977 Bayliner Victoria "Astral Blue"
MMSI #: 338127697
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