Fuel Consumption - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 18 Old 12-20-2011 Thread Starter
Swab
 
vega1860's Avatar
 
Join Date: Dec 2006
Location: At Sea
Posts: 809
Thanks: 2
Thanked 21 Times in 19 Posts
Rep Power: 9
 
Fuel Consumption

We do not have a fuel gauge on Lealea so I keep meticulous records of engine hours and fuel added. Over time I have determined that our Yanmar 2GM20 will run 2.5 hours on one gallon of diesel fuel; 32.5 hours on the main tank and 25 hours in reserve. We generally cruise under power at 2800rpm and waddle along at about 6.5 knots in flat calm water.

When calculating how far we can get under power I usually use 4 knots because the water is not usually flat calm out there. Sometimes we have found we are going up and down as much as forward.

Looking over my logbook I see that, in over 3000 nautical miles covered, our total fuel consumption for 2011 has been 12.2 gallons

Just wondering how others are managing fuel, other than just pretending the boat is a car and relying on the fuel gauge. Our friend Captain Wendell who operates a Vessel Assist boat out of Seattle tells us that out of gas due to faulty gauges is one of the most common reasons for help calls.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
vega1860 is online now  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 18 Old 12-20-2011
Senior Member
 
St Anna's Avatar
 
Join Date: Mar 2003
Location: Southern QLD, Bayside
Posts: 1,428
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 13
 
I do the same as you - only use engine hours and try and always keep tanks to the brim to reduce condensation.

I did have fuel guages and as I could not trust them I removed them. I will cruise at about 2000rpm which gives us 6.5kn in most conditions and I adjust for seastate if it is rough. We have the Yanmar 4JH2-UTE. Usually rough seas means some breeze so we sail in that case. I hate the ride through seas if only under motor.

The last 'larger' section I did, I used the motor more than I wanted and after 750nm, I needed 50L.

Just mucking around the Bay, I will have used more than this - especially after my father decided the turbo needs to be used more~3400rpm.

As for the running out of fuel, well, hopefully not and even though I am almost in suburbia now, I still keep another 4 20L jerry's


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
St Anna is offline  
Quote Quick Reply Share with Facebook
post #3 of 18 Old 12-20-2011 Thread Starter
Swab
 
vega1860's Avatar
 
Join Date: Dec 2006
Location: At Sea
Posts: 809
Thanks: 2
Thanked 21 Times in 19 Posts
Rep Power: 9
 
Quote:
Originally Posted by St Anna View Post
always keep tanks to the brim to reduce condensation.
Something we had to learn the hard way when we went north.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
vega1860 is online now  
Quote Quick Reply Share with Facebook
post #4 of 18 Old 12-21-2011
Senior Member
 
Join Date: Nov 2008
Location: Long Island
Posts: 2,136
Thanks: 4
Thanked 0 Times in 0 Posts
Rep Power: 7
 
I don't have guages, I use a dipstick. I don't track my usage, but I filled the tanks two years ago. After daysailing often (50 times a year?) and a few overnight cruises, I added 20 gallons this year. I probably had not used more than 40 in two years. I do like the 12 gallon figure. My figures indicate probably a half gallon per daysail. The engine is a 4-107, the boat 16tons.
WanderingStar is offline  
Quote Quick Reply Share with Facebook
post #5 of 18 Old 12-21-2011
Senior Member
 
Boasun's Avatar
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,070
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 10
   
Your engine will use about 0.6 lb of fuel per horsepower an hour. Diesel is 7.13 lb per Gallon.

So with my boat's engine of 64 HP, it is: 0.6 x 64/7.13 will give my approximate fuel consumpion per hour of 5.39 gallons an hour. My tanks max is 180. I fill my tanks to 10% short of 180 which is 162 gallons and divide that with 5.39 gives me about 29 hours of operating time, considering the thievage of the height of the pickup tubes above the bottom of the tanks.
It is a good thing I have a ketch because the wind is free.

1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Boasun is offline  
Quote Quick Reply Share with Facebook
post #6 of 18 Old 12-22-2011
Senior Member
 
JedNeck's Avatar
 
Join Date: Sep 2011
Location: Seattle, WA
Posts: 152
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
 
Didn't use a drop all year...I have a big electric outboard motor though.

I am a freak about MPG tracking in my car though. It's amazing what you can see just by watching fuel mileage.
JedNeck is offline  
Quote Quick Reply Share with Facebook
post #7 of 18 Old 12-22-2011
Senior Member
 
Join Date: Nov 2008
Location: Long Island
Posts: 2,136
Thanks: 4
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Quote:
Originally Posted by Boasun View Post
Your engine will use about 0.6 lb of fuel per horsepower an hour. Diesel is 7.13 lb per Gallon.

So with my boat's engine of 64 HP, it is: 0.6 x 64/7.13 will give my approximate fuel consumpion per hour of 5.39 gallons an hour. My tanks max is 180. I fill my tanks to 10% short of 180 which is 162 gallons and divide that with 5.39 gives me about 29 hours of operating time, considering the thievage of the height of the pickup tubes above the bottom of the tanks.
It is a good thing I have a ketch because the wind is free.
Only at max rpms I think. Even so, that seems high. I'm not disputing your figures, but my nominally 45 hp engine uses little over a gallon an hour at most, and usually less.
WanderingStar is offline  
Quote Quick Reply Share with Facebook
post #8 of 18 Old 12-22-2011
Morgan 33 O.I. Perryville
 
travlineasy's Avatar
 
Join Date: Dec 2010
Location: Maryland
Posts: 3,382
Thanks: 3
Thanked 143 Times in 127 Posts
Rep Power: 5
 
30-HP gasoline engine, 12,500-pound Morgan 33 O.I., slack tide running at 2,000 RPM, speed of 6.5 to 7.2 depending on bottom cleanliness, 1/2- GPH. This translates to 13 MPG, which I consider excellent fuel economy for this craft.

And, I always keep the fuel tank topped off. Condensation cannot form inside a tank that has no air inside.

Cheers,

Gary
travlineasy is offline  
Quote Quick Reply Share with Facebook
post #9 of 18 Old 12-22-2011
Senior Member
 
Cruiser2B's Avatar
 
Join Date: Jan 2011
Location: Va Beach
Posts: 537
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 5
 
Quote:
Originally Posted by travlineasy View Post
30-HP gasoline engine, 12,500-pound Morgan 33 O.I., slack tide running at 2,000 RPM, speed of 6.5 to 7.2 depending on bottom cleanliness, 1/2- GPH. This translates to 13 MPG, which I consider excellent fuel economy for this craft.

And, I always keep the fuel tank topped off. Condensation cannot form inside a tank that has no air inside.

Cheers,

Gary
I have gas A4 and use about 1gallon an hour !. I usually cruise at 18-2000 rpm at 5.5knt. I love the little engine as it is quiet and reliable and freshly rebuilt...but it is a gas hog! We had a good sailing season and used about 25 gallons total. I will someday either have a beta diesel or electric conversion....
Cruiser2B is offline  
Quote Quick Reply Share with Facebook
post #10 of 18 Old 12-23-2011
Courtney the Dancer
 
jrd22's Avatar
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,885
Thanks: 4
Thanked 22 Times in 21 Posts
Rep Power: 15
 
We have a fuel gauge that reads for both tanks and both tanks have sight tubes (I use these more often than the gauge) and I track all fuel and hours just because I'm anal about not running out of fuel (tanks hold 190 US gal), which will probably guarantee that I'll run out at some point:-)) Our old Volvo 62 hp consistently burns 1 gph at 2500 rpm which is a little over 6 knots through the water when calm. Wide open I"m sure it would use 3-4 gph.

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

jrd22 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
fuel consumption gas vs diesel jklewissf Gear & Maintenance 25 05-11-2013 07:28 PM
Fuel consumption question tireman Gear & Maintenance 15 05-18-2011 12:18 PM
Fuel Consumption SimonV General Discussion (sailing related) 10 02-14-2007 12:28 PM
Excessive Fuel Consumption pirateofcapeann Gear & Maintenance 8 01-22-2007 11:28 AM
fuel consumption Darco1 Gear & Maintenance 1 04-12-2005 01:15 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome