* themselves
I don’t mind that you and Pascal have embarrassed yourselves. The idea that larger engines have no effect on fuel economy is absurd. Drop the same power in a 54MY and 53MY and fuel usage will be very close to the same at hull speed. That’s what we were talking about, wasn’t it?
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Thread: 54 motor yacht
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Re: 54 motor yacht
Randy Register - Kingston, TN
www.yachtrelocation.com
www.Safes4Guns.com
aka Freebird aka Sparky1
1965 41DC #93
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Re: 54 motor yacht
Randy Register - Kingston, TN
www.yachtrelocation.com
www.Safes4Guns.com
aka Freebird aka Sparky1
1965 41DC #93
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Re: 54 motor yacht
Bird, pay attention to your driving. You ARE driving, aren't you?
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Re: 54 motor yacht
Randy Register - Kingston, TN
www.yachtrelocation.com
www.Safes4Guns.com
aka Freebird aka Sparky1
1965 41DC #93
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Re: 54 motor yacht
The 60MY at hull speed of 10 knots with the same engines as the OP. Just imagine how much less fuel we would be burning if our beam were the same as his.
Randy Register - Kingston, TN
www.yachtrelocation.com
www.Safes4Guns.com
aka Freebird aka Sparky1
1965 41DC #93
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Re: 54 motor yacht
Let me try this one last time.
8V71 performance data
http://powerforce.com/PDFs/2Cycle_En...DS_PF8V71T.pdf
12v71
http://www.powerforce.com/PDFs/2Cycl...S_PF12V71T.pdf
Look at the bottom curve, the fuel per HP per hour... at the same RPM the 8v71 and 12v71 requires the same amount of fuel per horsepower. Ex 1300rpm both use 0.4 lbs an hour per BHP. Clearly engine size has no effect on fuel burn if producing the same horsepower.Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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Re: 54 motor yacht
Let ME try this again. OP is running 8V92 700HP engines. You said the engines were not the primary factor in a 54 vs 53 fuel consumption and said the extra beam was the culprit.
Yes, if the 53 and 54 were equipped with the same power, the 53 would get better fuel economy, for all the reasons Captain Obvious pontificated. Even then, I’m guessing the difference between the two would be marginal. I’m sure I don’t have to remind you that Hatteras made the 1510’s because they were located inland. You can argue the point either way, but the 54 was a long awaited improvement over the classic, albeit dated 53.Randy Register - Kingston, TN
www.yachtrelocation.com
www.Safes4Guns.com
aka Freebird aka Sparky1
1965 41DC #93
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Re: 54 motor yacht
Obviously more beam is an improvement... that s not the point. We re discussing why the wider beam boats burn more fuel at hull speed. You claimed it was due to the larger engines. The fuel burn curves posted above shows engine size is irrelevant as they burn the same fuel per hp. The difference comes from the wider beam
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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Re: 54 motor yacht
Post up some GPH numbers from DD on those 8V92’s vs the highest HP 8V71’s available in a 53, then we’ll see.
Randy Register - Kingston, TN
www.yachtrelocation.com
www.Safes4Guns.com
aka Freebird aka Sparky1
1965 41DC #93
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Re: 54 motor yacht
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat