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12-03-2013, 12:40 PM
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#1
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Registered User
Country: holland
Location: lelystad
Occupation: making art
Interests: boats,cars,motorcycles,greyhounds
Boat name: suck gass and haul ass
Boat make: cougar 27 offshore class 2
Engines: twin johnson v6
Cruising area: wolderwijd/veluwemeer/amsterdam rijnkanaal/utrecht
Join Date: Apr 2012
Location: lelystad
Posts: 71
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single vs twin
what is the best option for top speed single or twin outboards on a 27 footer catamaran.
some say single is better because of less drag and weight other say twins are better?
im confused of what is really better.
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12-03-2013, 01:53 PM
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#2
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Registered User
Country: uk
Location: salcombe
Occupation: semi retired
Interests: racing(middle east class 3 6l)
Boat name: still no worries
Boat make: phantom18
Engines: 2.5 efi
Cruising area: salcombe
Join Date: Dec 2007
Location: salcombe
Posts: 499
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when you say single or twin what hp outboards are you thinking of ?
twin 300s against single 300 its a no brainer but are you thinking one 300 vs say twin 200s ?
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12-03-2013, 02:20 PM
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#3
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BananaShark Member
Country: UK
Location: Salcombe South Devon
Occupation: Racer and builder
Interests: Winning races
Boat name: BananaShark
Boat make: BananaShark 34' Race
Engines: Twin Yanmar BY 260's
Join Date: Mar 2004
Location: Salcombe South Devon
Posts: 4,638
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Quote:
Originally Posted by lucasv
what is the best option for top speed single or twin outboards on a 27 footer catamaran.
some say single is better because of less drag and weight other say twins are better?
im confused of what is really better.
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Need to know which cat as well as what you want it for, how fast do you want to go, how big your fuel and purchase budgets are and probably a couple of questions I haven't thought of yet!
Rule of thumb is add 30% more power to get the same performance from a twin rig ie: Single 300 you would need at least twin 175's if not twin 200's, they will be more money and cost more to run BUT you will have better acceleration low down, better manoeuvrability at slower speeds and something to get you home if one engine stops.
Hope that helps, I'm sure someone will come up with some different advice but that's the way I see things.
__________________
Cookee
British Champions! RIB Formula 1 2005
National Speed Record Holder at 90.15 (still)
www.bananasharkracing.com
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12-03-2013, 04:17 PM
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#4
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Quote:
Originally Posted by Cookee
Need to know which cat as well as what you want it for, how fast do you want to go, how big your fuel and purchase budgets are and probably a couple of questions I haven't thought of yet!
Rule of thumb is add 30% more power to get the same performance from a twin rig ie: Single 300 you would need at least twin 175's if not twin 200's, they will be more money and cost more to run BUT you will have better acceleration low down, better manoeuvrability at slower speeds and something to get you home if one engine stops.
Hope that helps, I'm sure someone will come up with some different advice but that's the way I see things.
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And a better ballanced boat with a single too..
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12-03-2013, 04:26 PM
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#5
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BananaShark Member
Country: UK
Location: Salcombe South Devon
Occupation: Racer and builder
Interests: Winning races
Boat name: BananaShark
Boat make: BananaShark 34' Race
Engines: Twin Yanmar BY 260's
Join Date: Mar 2004
Location: Salcombe South Devon
Posts: 4,638
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Quote:
Originally Posted by Hydrostream
And a better ballanced boat with a single too..
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Surely that would depend on the individual hull?
__________________
Cookee
British Champions! RIB Formula 1 2005
National Speed Record Holder at 90.15 (still)
www.bananasharkracing.com
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12-03-2013, 09:51 PM
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#6
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Quote:
Originally Posted by Cookee
Surely that would depend on the individual hull?
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Thats true I suppose, but pulling a significant amount of weight off the back of a cat can never be a bad thing.
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