You are all right. I blew it and substituted the weight of 1 US Gal. of gasoline for water. Waggoners was correct with 8.3lbs.
At least I haven't ever put gas in my water tanks. Thanks for the catch. On Sep 3, 3:47 pm, "e b" <[email protected]> wrote: > the below statements make no sense... > > "Thanks to Waggoners (a good Northwest boating journal) you know the > weight of one gal of water is 6.2lbs and diesel is 6.7 lbs. Doing the > math my fuel weight can be as much as 3,350 lbs and water 1,085 lbs. > That's a lot to haul around. > > water is heavier than diesel, ( diesel floats on water ) so it would seem " > the waggoners " is not a good boating journal...! > eric > > ----- Original Message ----- > From: [email protected]<mailto:[email protected]> > To: [email protected]<mailto:[email protected]> > Sent: Friday, September 03, 2010 3:42 PM > Subject: Re: [UnifliteWorld] Re: cruising rpm? > > Imperical is not Celsius, liters, or kilos. It is gallons, pounds, and > fahrenheit > Canada would be kilos per liter. > The point about specific gravity and temperature as it relates to fuel > weight on board is moot. Apart from knowing the approximate volume of a full > fuel tank, we have no idea the volume after we have run for an hour or so. > Unless you have fuel gauges that show you how many gallons you have on > board you can't produce more accurate calculations than you have instruments > to measure. > Besides, we are not making a trip to the moon, these are cruising boats. > > Sent via BlackBerry by AT&T > > ------------------------------------------------------------------------------ > > From: David Oates <[email protected]> > Sender: [email protected] > Date: Fri, 3 Sep 2010 15:16:01 -0700 (PDT) > To: <[email protected]> > ReplyTo: [email protected] > Subject: RE: [UnifliteWorld] Re: cruising rpm? > > Therefore, an Imperial gallon is bigger than a gallon in the US (or > is the Imperial gallon weighted at 1 degree C). Does Canada sell fuel in > Imperial gallons? > > --- On Fri, 9/3/10, Monty Montaine <[email protected]> wrote: > > From: Monty Montaine <[email protected]> > Subject: RE: [UnifliteWorld] Re: cruising rpm? > To: "[email protected]" > <[email protected]> > Date: Friday, September 3, 2010, 11:21 AM > > Weight of 1 US Gallon of water = approx. 8.35 lb > > Weight of 1 imperial gallon (eg UK measure) of water weighs 10 > pounds by definition, at a specified temperature and pressure. > > -----Original Message----- > From: > [email protected]<about:/mc/[email protected]> > > [mailto:[email protected]<about:/mc/[email protected]>] > On Behalf Of Bob S > Sent: September-03-10 11:00 AM > To: UnifliteWorld > Subject: [UnifliteWorld] Re: cruising rpm? > > Same on my boat which is a 42' with twin diesel. > > As best as I can calculate the miles/gal is about the same between > 11-16knots. Below is better, above is worse. > > The only real difference in that range seems to be overall weight > which is in large part a function of fuel and water load. I have 4 > fuel tanks (fwd-50gal, aft 50gal, and saddle tanks at 150gal ea.) > and > 175 gal of water under the aft cabin bunk. The farther forward the > weight the better so I manage the aft water load, keep the aft fuel > tank empty and use the forward fuel tank as the emergency reserve > should I screw up on the saddle tank load. > > Thanks to Waggoners (a good Northwest boating journal) you know the > weight of one gal of water is 6.2lbs and diesel is 6.7 lbs. Doing > the > math my fuel weight can be as much as 3,350 lbs and water 1,085 lbs. > That's a lot to haul around. > > There is some good news. The extra weight seems to effect the > mileage > more the faster you go, so - I run fast and empty as possible to get > to the islands then fill up and cruise slowly around. It works > perfectly for the northwest where there are lots of choices once you > reach your destination area. The big negative is fuel price > differences. This summer, fuel in Seattle was $2.75 as I left. The > farthest point north I traveled in Canada it was $4.40/gal (all > adjustments to US $ made). Kinda suggests you stay close to home. > > Any other fuel saving suggestions? Drift with the current? 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