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Old 20-07-2009, 11:47   #31
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just curious: water weighs about 8 lbs/gallon. What does gas and diesel weigh?

Never mind, I googled it. It seems diesel weighs about 7 lbs/gallon, while gasoline is about 6.25 lbs/gallon.
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Old 20-07-2009, 12:29   #32
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...water weighs about 8 lbs/gallon...

Those would be "lite", not "real" gallons.

The Imperial gallon is now legally defined as 4.54609 litres, and was originally defined as the volume of 10 pounds of water at 62 ̊F. An Imp. Gal is 277.42 cubic inches.
The U.S. gallon is legally defined as 231 cubic inches.
A US Gallon 231 cubic inches. A US Gal of water weighs about 8.33 pounds at 62 ̊F.

An Imperial Gallon of diesel weighs about 8.5191 pounds,
whereas a US Gallon of diesel weighs about 7.0936 Lbs.

Gasoline weighs about 7.504 Lbs/Imp Gal,
and about 6.2484 Lbs/US Gal.
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Old 20-07-2009, 14:22   #33
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An Imperial Gallon of diesel weighs about 8.5191 pounds,
whereas a US Gallon of diesel weighs about 7.0936 Lbs.

I had no idea I was saving so much weight using U.S. diesel It seems it costs less as well.
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Old 22-07-2009, 06:50   #34
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I stand corrected! That error would have put me out 30 lbs on my 90 gallon water tank!
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Old 22-07-2009, 13:18   #35
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I stand corrected! That error would have put me out 30 lbs on my 90 gallon water tank!
Or, to put that small margin of error in perspective, about 80 bottles of beer!
Perhaps, nearly a full week's provisioning (single moderate consumer).
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Old 23-07-2009, 05:19   #36
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Wow - that imperial measurement system is really confusing isnt it!!

Water - 1 litre - 1 kilo
Fuel a little less

Near enough for me.

For the record - I carry 120 litres in total and using 1 motor at a time at 5-6 knots I have a range of 300-500 nautical miles.
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Old 23-07-2009, 06:19   #37
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Wow - that imperial measurement system is really confusing isnt it!!

Water - 1 litre - 1 kilo
Fuel a little less

Near enough for me.

For the record - I carry 120 litres in total and using 1 motor at a time at 5-6 knots I have a range of 300-500 nautical miles.
now, there's something we can definitely agree on!
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Old 17-06-2010, 15:00   #38
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I notice on the Blue Water Rally several of the boats solved the problem by having a large bladder strapped to the foredeck. One boat reported major dramas just keeping it there in big seas. Apart from that, I would be pretty concerned about having that much weight so high on the foredeck. Does anyone have experience with them?

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Old 17-06-2010, 15:24   #39
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Large weights mounted high and well forward should be avoided.

I have not used bladders, but they are generally mounted low, e.g. in a well or on a floor space that provides some constraint. Even then, I would worry about accidental damage. The best options (IMO, in my order of preference) are typically to constrain fuel use, install adequate tankage, or use more solid canisters.
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