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Saxe Point
Joined: 24 Jan 2012 Posts: 77 City/Region: Sooke
State or Province: BC
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thataway
Joined: 02 Nov 2003 Posts: 20866 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Mon Apr 23, 2018 11:41 am Post subject: |
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That looks like a great app--the fuel flow meter is about $300 US (shipping?). It can be done for less, if you have a system, such as Lowrance or Garmin which has the Transducers, which typically go for $150 to $200, but if you don't have the NMEA 2000 backbone, then it would bring it up to the $300 level. Nice to not have to run wires, and for older boats without a modern MFD which will show fuel flow and calculate the MPG etc. If I had a boat without a fuel flow system, I would certainly consider this one. Thanks.
Colby, I don't know what year Mercury integrated smart craft into the outboards. Suzuki did by 2007. But a Mercury manual from 2001 addresses the fuel use from the engine computer via Smart Craft Gauges--so your motor should just require the proper cable and adaptor from the computer and integration into the Garmin. Or for about $200 you can get the cable and a dash gauge which will show the information directly--for a little more you can get an android app. with wireless transmission.. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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colbysmith
Joined: 02 Oct 2011 Posts: 4578 City/Region: Madison
State or Province: WI
C-Dory Year: 2009
C-Dory Model: 25 Cruiser
Vessel Name: C-Traveler
Photos: C-Traveler and Midnight-Flyer
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Posted: Mon Apr 23, 2018 12:58 pm Post subject: |
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Quote: | -so your motor should just require the proper cable and adaptor from the computer and integration into the Garmin |
And that is where I got hung up on stuff. Trying to find that adaptor. Wasn't getting much information from the shops I was talking to back when... Perhaps I just need to get a hold of Merc and find out what's needed and the cost. I already have a network hooked up to the Garmin, which has the gauge page. (However, it's not the Garmin network, but rather the one RayMarine required for their autopilot. Another PITA regarding installing the lowcost RayMarine autopilot with everything else Garmin.) It would be nice to change all that stuff out and go strictly Garmin. But it's an added cost I'm not willing to pay! Colby |
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hardee
Joined: 30 Oct 2006 Posts: 12633 City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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Posted: Mon Apr 23, 2018 7:33 pm Post subject: |
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Something to keep in mind; Miles per gallon if you are on salt water is a variable. That is due to the ever moving tidal currents. If you are doing cross tide runs just for the numbers it is possible to get repeatable numbers, but for practical purposes miles per gallon on boats is going to have to be approximations. And hours per gallon (or more realistically gallons per hour) will be more useful for repeatability, not so much for fuel use planning.
Harvey
SleepyC _________________ Though in our sleep we are not conscious of our activity or surroundings, we should not, in our wakefulness, be unconscious of our sleep. |
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thataway
Joined: 02 Nov 2003 Posts: 20866 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Mon Apr 23, 2018 7:40 pm Post subject: |
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Harvey,
Although there are always some tidal and current influences, many parts of the world in the oceans these are minimal--and can be from any direction. Some places they vary in speed, but usually consistent in direction--then occasionally they will change with no reason for a brief period of time.
That there are currents (not all tidal) is all the more reason to have a fuel flow device and know amount of fuel used, unless you have huge tankage. Many of the ocean crossing trawlers and large yachts have "day tanks" so there is a very accurate recording of fuel used, as well as the flow meters. |
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NewMoon
Joined: 21 Dec 2008 Posts: 430 City/Region: Holladay
State or Province: UT
C-Dory Year: 1991
C-Dory Model: 22 Cruiser
Vessel Name: Cindy Sea
Photos: Cindy Sea
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Posted: Mon Apr 23, 2018 9:34 pm Post subject: |
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FWIW, I've kept records of every refuel, and every mile traveled over ground (via GPS) for the entire 18 years and 39,000 nautical miles I cruised with New Moon. 95% of this was on the Inside Passage, with tides and currents aplenty.
My mileage would vary considerably at first, when I spent some time at 18 knots and some at 6, with the proportion being pretty variable.
But after I settled down to traveling mostly at 6 knots, NMPG figures from tank to tank became remarkably consistent. I guess if I log a bunch of miles, the currents average out reasonably well.
For the last four years and more than 9,000 NM, averages by year were 3.84 NMPG, 4.18 NMPG, 4.27 NMPG, and 4.25 NMPG.
So I planned my fuel range based on 4 NMPG.
Remarkably enough, I get almost the same NMPG with the 37 Nordic Tug at 7 knots. _________________ Richard Cook
Dream Catcher (Nordic Tug 37, 2016 to present)
New Moon (Bounty 257, 1998 to 2016)
Cindy Sea (CD 22 Cruiser, from 1991 to 1998)
"Cruising in a Big Way" |
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Marco Flamingo
Joined: 09 Jul 2015 Posts: 1155 City/Region: Seattle
State or Province: WA
C-Dory Year: 2004
C-Dory Model: 16 Cruiser
Vessel Name: Limpet
Photos: Limpet
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Posted: Tue Apr 24, 2018 10:43 am Post subject: |
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I kept our log book from our Monk designed cruiser. No gauges on the tanks, so we kept track of fuel usage primarily by engine hours. It was an odd feeling at first, but after a hundred hours of keeping track, it seemed fine to simply check the log book and calculate that we had plenty of fuel to go from Ballard to Friday Harbor and back.
I get a little nostalgic looking at the efficiency. Plus, diesel was 64 cents a gallon. I should have done more cruising. Words to live by.
Mark |
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