Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-06-2013, 11:26   #1
Registered User

Join Date: Jul 2011
Location: Alameda, CA
Boat: C&C Newport 41
Posts: 586
how much fuel

it is time to put in new tanks.

I have (basically) decided on 75 gallons for water and am trying to sort out how much fuel i should carry.

most of the sailing will be gunking down the west coast and then from island to island in the in the carribbean. i can see myself motor sailing in the doldrums and certainly when i head north to seattle from san fran.

i am not constrained by limited space.

thoughts?

-steve
__________________

__________________
ssanzone is offline   Reply With Quote
Old 18-06-2013, 11:54   #2
cat herder, extreme blacksheep
 
zeehag's Avatar

Cruisers Forum Supporter

Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 17,767
Images: 56
Send a message via Yahoo to zeehag Send a message via Skype™ to zeehag
Re: how much fuel

figureout your longest possible passage.
do the math with how much fuel your bot uses and what the average boatspeed is going to be--figgr 3-4 kts.
then figure ut how much fuel that would be and add 10-20 gallons. that should be your tank size, ideally.
__________________

zeehag is offline   Reply With Quote
Old 18-06-2013, 11:56   #3
Registered User

Join Date: Jun 2010
Location: Sailing the Caribbean
Boat: Switch 51
Posts: 1,498
Re: how much fuel

You don't say the model or size of boat you have, but my answer is as much as you reasonably are able to.
__________________
SVNeko is offline   Reply With Quote
Old 18-06-2013, 19:36   #4
Registered User

Join Date: Jul 2011
Location: Alameda, CA
Boat: C&C Newport 41
Posts: 586
Re: how much fuel

it is a newport 41. about 9 tons.

what do most cruisers have for tanks and do you wish they were bigger or never get close to running dry?
__________________
ssanzone is offline   Reply With Quote
Old 18-06-2013, 19:46   #5
Registered User

Join Date: Jun 2010
Location: Sailing the Caribbean
Boat: Switch 51
Posts: 1,498
Re: how much fuel

Well, I carry about 170 gal in tanks and have about 15 5 gal jerry jugs. The jugs came with the boat to me, which had crossed two oceans by then. Since I bought it, my boat has crossed the pacific and from mexico to california and we used the jugs both times (IOW wished I had more tankage). If you will always be where it is easy to fill up, then its not so critical.
__________________
SVNeko is offline   Reply With Quote
Old 18-06-2013, 21:12   #6
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,314
Re: how much fuel

The N41 sails pretty well in light airs, so you should get by with about 75 gallons in the main tank and another 20 gallons in jerry jugs, which will also serve as a way to carry fuel where there are no fuel docks. That should get you a motor sailing range of nearly 1000 miles. Carry too much and your boat won't sail well anymore.
__________________
donradcliffe is offline   Reply With Quote
Old 18-06-2013, 23:27   #7
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,013
Images: 5
Re: how much fuel

To me, it depends where the tanks will end up. If you have to saddle them high up, like in the lazarette of an aft cockpit, then they should be kept smaller as the CG would be raised. If they were going in the bilge, you can go higher in volume. My water tank is 75 gallons in the keel as is my 50 gallons of fuel. Being a center cockpit I stow 4, 5 gallon polyethelyne containers on each side. They are well below the waterline. The same goes for 2 Gerry jugs for fuel on each side. So 110 total for water and 70 total for fuel. Now need to fill them up for coastal though. But it is really nice not having to shell out 5 grand for a watermaker.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 18-06-2013, 23:54   #8
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Re: how much fuel

Three days of fuel, cruising rpms, running the whole time, is what I've been happy with. I'd have that include my jerry cans.
__________________
rebel heart is offline   Reply With Quote
Old 19-06-2013, 00:43   #9
Registered User

Join Date: Nov 2011
Location: Montegut LA.
Boat: Now we need to get her to Louisiana !! she's ours
Posts: 3,421
Re: how much fuel

If ya can keep em low, better to much then not enough!! Just my 2 cents
__________________
Bob and Connie
bobconnie is offline   Reply With Quote
Old 19-06-2013, 00:50   #10
Senior Cruiser
 
roverhi's Avatar

Cruisers Forum Supporter

Join Date: Aug 2005
Location: Kona, Hawaii, Carlsbad, CA
Boat: 1969 Pearson 35 #108 & 1976 Sabre 28
Posts: 6,003
Send a message via Yahoo to roverhi
Re: how much fuel

We carried 140 hours of fuel on our cruise to SoPac. Went a year without refueling. Sailing in the areas that you plan, fuel and services will never be far away. 72 hours fuel at 5k should be adequate as rebel heart said.
__________________
Peter O.
'Ae'a Pearson 35
roverhi is offline   Reply With Quote
Old 19-06-2013, 01:23   #11
Wayfaring Mariner
 
captain58sailin's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Homer, AK is my home port
Boat: Skookum 53'
Posts: 4,045
Images: 5
Re: how much fuel

It would be a good idea to take the consumption rate per hour at cruise speed, multiply it by 120 hours, and add 30%. When you get into heavy weather, if you have to motor you will consume more than you anticipate and go slower than expected. The last thing you want to do is worry about making landfall before the fuel runs out if for what ever reason you cannot apply a sail to the equation. There is an old saying which I absolutely loath, but applies in this situation "Plan for the worst and hope for the best".
__________________
" Wisdom; is your reward for surviving your mistakes"
captain58sailin is offline   Reply With Quote
Old 19-06-2013, 01:34   #12
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,737
Re: how much fuel

How long is a piece of string? There's no real answer to this.

I have 680 liters. I spend about 90 days on board a year and 50 - 55 days at sea. I heat (in a cold climate; heating can be needed any month of the year) and generate electricity with diesel fuel. I don't have shore power on my mooring so use my diesel generator several hours a day when I'm on board.

I have a 100hp Yanmar which uses anything from 6 liters an hour on up, depending on the speed. However, I am in a windy place, so don't motor very much.

Despite all this on-board demand for diesel fuel, a full tank lasts me almost a year. I last filled up in July, 2012 and still have half a tank left. It is true that this particular year my boat was on the hard with shore power for several months undergoing a refit. But even with shore power, I was heating with diesel.

So is my tank too big? I think it's not good to turnover the fuel this slowly. I guess I could fill it only partially -- apparently all the business about condensation in partially filled tanks is a myth.

But if I were doing tankage from scratch, and had enough space for it, here is what I would do:

1. First of all, a gravity feed DAY TANK. This is the dog's danglies for a cruising yacht, a firm guarantee against fuel problems underway. A good sight tube on it so you can see exactly what you're putting into it, or better yet, it should be altogether transparent. As the name implies, this should hold enough for a typical day's consumption.

2. Working fuel tank, about 300 liters. With sump and dip tube; fittings for ultrasonic level gauge and polishing system. This would be used for normal operation in areas where fuel is readily available. Polish the fuel regularly, and dip the sump to be sure everything is clean before filling the day tank.

3. Passage tank, about 500 liters. For a transat or extended cruise with questionable availability of fuel. Normally kept empty. Sump, dip tube, etc. like the main tank. Feeds the day tank directly, not the main tank (so you can switch in case one tank gets contaminated).

All made out of quality polyethylene, like what TekTanks make.

YMMV, of course, and should be adjusted for the way you cruise and your own levels of consumption.
__________________
Dockhead is offline   Reply With Quote
Old 19-06-2013, 02:06   #13
Registered User
 
boat_alexandra's Avatar

Join Date: Aug 2009
Location: Masachusetts
Boat: bristol 27
Posts: 2,803
Re: how much fuel

_none_
__________________
boat_alexandra is offline   Reply With Quote
Old 19-06-2013, 12:43   #14
Registered User

Join Date: Jul 2011
Location: Alameda, CA
Boat: C&C Newport 41
Posts: 586
Re: how much fuel

excellent feedback.

the tank(s) will be located in the lazarette and i have a water maker so i dont need to an excessively large water tank.

at 8lbs per gallon, i am mindful of how many combined gallons i want to carry. i could easily go 50 gallons per and use the water maker more often but i may end up running the engine to recharge the bank that was drained by the water maker.

everything is a trade off.
-steve
__________________
ssanzone is offline   Reply With Quote
Old 19-06-2013, 21:59   #15
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Re: how much fuel

For whatever it's worth, diesel is usually more in the ~7lbs per gallon range. Seems like a minor thing but 100 gallons is 700 pounds instead of 800 pounds, which is relevant. Good luck, regardless.
__________________

__________________
rebel heart is offline   Reply With Quote
Reply

Tags
fuel

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:08.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.