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Author Topic:   Power Loss with 2 Motors?

elaelap posted 01-19-2003 01:51 PM ET (US)
My fishing buddy and mentor, George, has skippered big party boats for 25+ years. Now he has an ugly 26 ft Thunderbird with two 4 cyl OMC i/o drives which he uses as a six-pack for salmon, rock fish, whale- and bird-watching, ash scattering, and crab; I go along as unpaid deckhand when he's not full.
George insists that he loses at least one-fourth of his high-end thrust/horsepower when both props are turning at the same time (he wouldn't change for the world, because he loves the offshore security of having two motors). I know that many of you power your larger BWs with two outboards (not an option for my '71 Katama 16, thank God...I already have a large mortgage on my home). My question is: does George's theory hold water, or cavitate? That is, would one 200 hp outboard out-perform two 100 hp motors, all other factors equal?
Tony
PS--Hope this topic is in the proper forum, jimh...I flipped a coin and "Performance" lost.
Tom W Clark posted 01-19-2003 02:03 PM ET (US)
Tony,
Yes, ceteris paribus, a 200 hp motor will significanlty out perform twin 100 hp motors. One gearcase is much less drag than two gearcases.
elaelap posted 01-19-2003 02:27 PM ET (US)
Tom: George bases his theory on props interferring with one another; but anyway, his theory is right, I guess, and my old buddy is vindicated. As they say, paribus sententiis reus absolvitur.
Tony

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Author	Topic: Power Loss with 2 Motors?
elaelap	posted 01-19-2003 01:51 PM ET (US) My fishing buddy and mentor, George, has skippered big party boats for 25+ years. Now he has an ugly 26 ft Thunderbird with two 4 cyl OMC i/o drives which he uses as a six-pack for salmon, rock fish, whale- and bird-watching, ash scattering, and crab; I go along as unpaid deckhand when he's not full. George insists that he loses at least one-fourth of his high-end thrust/horsepower when both props are turning at the same time (he wouldn't change for the world, because he loves the offshore security of having two motors). I know that many of you power your larger BWs with two outboards (not an option for my '71 Katama 16, thank God...I already have a large mortgage on my home). My question is: does George's theory hold water, or cavitate? That is, would one 200 hp outboard out-perform two 100 hp motors, all other factors equal? Tony PS--Hope this topic is in the proper forum, jimh...I flipped a coin and "Performance" lost.
Tom W Clark	posted 01-19-2003 02:03 PM ET (US) Tony, Yes, ceteris paribus, a 200 hp motor will significanlty out perform twin 100 hp motors. One gearcase is much less drag than two gearcases.
elaelap	posted 01-19-2003 02:27 PM ET (US) Tom: George bases his theory on props interferring with one another; but anyway, his theory is right, I guess, and my old buddy is vindicated. As they say, paribus sententiis reus absolvitur. Tony