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Old 16-03-2019, 08:47 AM   #1
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Country: uk
Occupation: Diamond/Jewellery/Rolex dealer
Boat name: Beyond Obsession
Boat make: P25
Engines: merc 2x200XS SSROS
Cruising area: solent/altea

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Posts: 248
Twins vs single motors

Just a question i was asking myself.
What are the advantages/ disadvantages of twin motors or singles and why twins these days.I can understand i years gone by when motors were not pushing so much hp out so a couple or 3 were required but now we get to 400hp single surely the gain must be in a single set up with less weight .
I am sure there will be a lot of different views on this .
Cheers
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Old 16-03-2019, 05:21 PM   #2
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Country: Uk, sometimes Dubai
Location: Newmarket, Suffolk
Occupation: Racehorse Exercise Rider
Interests: Powerboating, Squash, Running, Horseracing
Boat name: FAT BOY
Boat make: Cougar 27'
Engines: EVINRUDE G2 300
Cruising area: Orwell, Harwich, East Coast

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Location: Newmarket, Suffolk
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Quote:
Originally Posted by nick1 View Post
Just a question i was asking myself.
What are the advantages/ disadvantages of twin motors or singles and why twins these days.I can understand i years gone by when motors were not pushing so much hp out so a couple or 3 were required but now we get to 400hp single surely the gain must be in a single set up with less weight .
I am sure there will be a lot of different views on this .
Cheers
I'm no expert but I think the biggest gain with running a twin setup has to be the handling with the 2 props counter rotating against each other and eliminating possible prop torque with a single setup, as you said, you can now bolt on up to a 400 on a boat like yours, there is a guy in Norway with a P25 running a 400r which previously ran as a double setup at sometime during its life, he posted on here with various results with engine heights & props etc. with the 400r with very good results in all areas.
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Old 16-03-2019, 05:26 PM   #3
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Country: Uk, sometimes Dubai
Location: Newmarket, Suffolk
Occupation: Racehorse Exercise Rider
Interests: Powerboating, Squash, Running, Horseracing
Boat name: FAT BOY
Boat make: Cougar 27'
Engines: EVINRUDE G2 300
Cruising area: Orwell, Harwich, East Coast

Join Date: Sep 2012
Location: Newmarket, Suffolk
Posts: 210
Quote:
Originally Posted by nick1 View Post
Just a question i was asking myself.
What are the advantages/ disadvantages of twin motors or singles and why twins these days.I can understand i years gone by when motors were not pushing so much hp out so a couple or 3 were required but now we get to 400hp single surely the gain must be in a single set up with less weight .
I am sure there will be a lot of different views on this .
Cheers
http://www.boatmad.com/forum/f3/phan...00r-29810.html

Take a read of this, the guy in Norway I mentioned earlier...
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Old 16-03-2019, 10:24 PM   #4
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Country: uk
Occupation: Diamond/Jewellery/Rolex dealer
Boat name: Beyond Obsession
Boat make: P25
Engines: merc 2x200XS SSROS
Cruising area: solent/altea

Join Date: Mar 2008
Posts: 248
Twins vs single

Thanks for the info very informative .But i do think that sounds like a set up for glass flat water in a bang straight line .It looks like a single engine definitely quicker under these conditions.But what in real sea conditions is there any advantage of twins .When you think twice the cost ish twice the fuel just double everything except hull.
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