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From: Mark (no email)
Date: Thu Jun 08 2006 - 01:35:57 EDT
Whether it's 1.44 or 3.1 gals/mile that's
.69 or .32 mpg, but a mainship 40 at 13 knots is only 1.1 mpg (2.5 mpg at 6.7 knots).
(http://www.mainship.com/fueleconomy/yanmar2.html)
It seems that boat are just stuck in this 1-2 mpg rut.
I'd still like a 10mpg boat at 10 knots ;-)
Mike Maurice <> wrote: > Hidden in the small print is information about fuel consumption and range.
> At its top speed the Fountain 47 burns an estimated 2.88 gallons per MINUTE
> or
> 258 gallons per hour. The range on a 314 gallon tank is 213 miles at a mere
> 60 mph. This works out to 1.44 gal/mile or 129 gal/hr at this admittedly
> high cruising speed.
There must be some might sleepy mathematicians driving around this
afternoon. 2.88 gpm works out to be about 175 gals per hour, not 258.
At 175 gals per hour, the range on 314 gallons is only about 1 3/4
hours. If that is at 60 mph, then the range is about 100 miles. If it's
at 90 mph, it's about 160 miles.
These range figures work out to about 3.1 gals per mile, which brings us
back to the 2.88 gpm, which 60 mph divides back into 60 minutes, exactly.
Somehow all this reminds me a a 50' Ferreti that I ran one time. It had
twin 800 hp Cats and would do 30 knots. It carried about 400 gals and
had about 150 miles of range at 20 knots.
The Fountain 47 must made out of rice paper to be light enough to do
over 80 mph, or even 60 knots.
Mike
_____________________________________
Capt. Mike Maurice
Beaverton Oregon(Near Portland)
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