Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-19-2019, 07:29 PM   #1
Member
 
City: Ripon, California
Country: USA
Join Date: Feb 2019
Posts: 5
Fuel Consumption for 3208TA in 48' MY

I'm trying to estimate fuel costs for a long transit in a 48 Californian Aft Cabin MY running 3208TA's. Speed around 8kts. Any help out there?
Thanks,
Jerry
__________________
Advertisement

JerryD is offline   Reply With Quote
Old 02-19-2019, 07:38 PM   #2
Guru
 
IRENE's Avatar
 
City: Port Angeles, WA
Country: USA
Vessel Name: Irene
Join Date: Jan 2016
Posts: 722
Alaskan Sea Duction should be along shortly...
__________________

__________________
Jeff
MV IRENE
IRENE is offline   Reply With Quote
Old 02-19-2019, 07:43 PM   #3
Guru
 
City: Anacortes
Country: USA
Join Date: Nov 2012
Posts: 759
I get about 3mpg at 8kts, on my 48 Tolly. Iím about 47k pounds and semi-displacement moderate keel and soft chines.
ghost is offline   Reply With Quote
Old 02-19-2019, 08:48 PM   #4
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,474
Are we talking an ocean transit or protected water ways. For ocean transit at 8 kts I would do all my planing at 1 gallon per nautical mile. You should do better but it’s a good place to start.

When I ran my boat up the coast I got anywhere from 1.5 to 1 gallons per nautical mile running a 54’ very empty boat powered by twin 3208T’s at 10 kts. The variance was caused by weather conditions. You can burn a lot of fuel climbing 20’ swells and crashing through 6’ waves. I don’t think TA’s are going to be any different at these low power settings.

I wouldn’t be surprised if you got the number down to .75 gallons per nautical mile but I wouldn’t plan on it.
tiltrider1 is offline   Reply With Quote
Old 02-19-2019, 09:08 PM   #5
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,474
In protected waters I burn .9 gallons per nautical mile cruising at 10 kts. I have never done an extended 8 kt run.

It was easy for me to get this data. I filled all tanks to to a visible sight line before the trip. Filled to the same sight line at each port of call and did the same at the end of the trip. I also repeated this with our 3 week trip this summer which was all protected water ways to get a comparison.
tiltrider1 is offline   Reply With Quote
Old 02-19-2019, 09:15 PM   #6
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,307
8 kts on a 48 is way less power than 10kts on a 54. 8kts on a 48 I'll guess 1.5-2nm/gal. Well below hull speed at 8kts. 10kts on the 54 is trying to climb the hump, lots more power needed.
Ski in NC is offline   Reply With Quote
Old 02-19-2019, 09:28 PM   #7
Member
 
City: Ripon, California
Country: USA
Join Date: Feb 2019
Posts: 5
I'm looking at offshore transit from Marina del Rey, California north to the Delta..
About 440 Nm
JerryD is offline   Reply With Quote
Old 02-19-2019, 09:52 PM   #8
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,307
So 440 nm at 1.5nm/gal is 293 gal. How much fuel do you carry? Slow it down to 7 or 7.5kts and range goes up a good bit.
Ski in NC is offline   Reply With Quote
Old 02-19-2019, 10:06 PM   #9
Member
 
City: Ripon, California
Country: USA
Join Date: Feb 2019
Posts: 5
I believe that the 48 carries 560 gallons
JerryD is offline   Reply With Quote
Old 02-19-2019, 10:19 PM   #10
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,474
Quote:
Originally Posted by Ski in NC View Post
8 kts on a 48 is way less power than 10kts on a 54. 8kts on a 48 I'll guess 1.5-2nm/gal. Well below hull speed at 8kts. 10kts on the 54 is trying to climb the hump, lots more power needed.
I agree with you Ski. Thatís why I spelled it all out.

Going from Marina Del Rey to the Delta you will have some current and wind on the nose but insignificant if weather is good. You also have plenty of fuel stops along the way.

I would make two plans. One for 1 nmpg and one for 1.5 nmpg. Then monitor your consumption, at half tank you will know which plan you are on.
tiltrider1 is offline   Reply With Quote
Old 02-19-2019, 10:20 PM   #11
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,474
Quote:
Originally Posted by JerryD View Post
I believe that the 48 carries 560 gallons
That makes it easy. Fill her full and go.
tiltrider1 is offline   Reply With Quote
Old 02-20-2019, 04:16 AM   #12
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,790
The 42 GB with 3208TAs that we chartered was not even close to those numbers.
We used 271 gal in 180 statute mile trip at 1350 RPM, 7 knots. 10 hours of gen time.
At 1500 RPM those cats suck 5 gph each!!! The fuel curves are readily available online.
__________________
Archie
1984 Monk 36 Hull #46
Currently southbound in Chesapeake Bay
High Wire is offline   Reply With Quote
Old 02-20-2019, 06:10 AM   #13
Veteran Member
 
Bare Necessities's Avatar
 
City: Grand Rivers, KY
Country: USA
Vessel Name: Bare Necessities II
Vessel Model: 1989 Carver Californian 48' ACMY
Join Date: Jun 2018
Posts: 51
I have a 1989 48' Californian aft cabin with 3208/375hp. I have ran against the current on the Cumberland River averaging 12-13 mph and only got 1 mpg. On my return trip I slowed it down a bit to 9-10 mph running with the current and got 2 mpg. Both ways the generator was running also. Sorry but I don't have a better fix on it than that. I would expect if I would hold it down to 8-9 mph I would get a little better. One of the other posters mentioned that the 48 carries 560 gallons. I am pretty sure that is correct. I think I have two 200 gallons on each side and a 160 gallon aft tank.
Bare Necessities is offline   Reply With Quote
Old 02-20-2019, 09:31 AM   #14
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,474
Quote:
Originally Posted by Bare Necessities View Post
I have a 1989 48' Californian aft cabin with 3208/375hp. I have ran against the current on the Cumberland River averaging 12-13 mph and only got 1 mpg. On my return trip I slowed it down a bit to 9-10 mph running with the current and got 2 mpg. Both ways the generator was running also. Sorry but I don't have a better fix on it than that. I would expect if I would hold it down to 8-9 mph I would get a little better. One of the other posters mentioned that the 48 carries 560 gallons. I am pretty sure that is correct. I think I have two 200 gallons on each side and a 160 gallon aft tank.
This is why fuel consumption is such a tricky subject. All the above info is miles per gallon which now needs to be translated into nautical miles per gallon. So at 8 kts he got 1.75 miles per gallon on a river running down stream.

The fuel curves I have for 3208Tís Show 3.8 gallons at 1500 rpms per engine. However I have always done Better than the numbers on my fuel curve.
tiltrider1 is offline   Reply With Quote
Old 02-20-2019, 09:57 AM   #15
Guru
 
Alaskan Sea-Duction's Avatar
 
City: Inside Passage Summer/Columbia River Winter
Country: USA
Vessel Name: Alaskan Sea-Duction
Vessel Model: 1988 M/Y Camargue YachtFisher
Join Date: Jul 2012
Posts: 4,742
Welcome Jerry. Below were my numbers in 2017 for our trip to Alaska and back. We do travel "Outside" from Astoria to Neah Bay" about 190 miles one way. We do travel this section at about 13-14kts @ 2100RPM. Good luck. and Welcome.



FINAL NUMBERS for ASD:

∑ Total Days of Cruise: 143

∑ Total Miles: 3649

∑ Moorage Costs: $3774 (includes 5 weeks at Ketchikan)

∑ Total Fuel: $7263

∑ Average Cost Per Gallon: $2.91

∑ Average MPG: 1.5

∑ Average Burn Rate: 5.94 gph (Includes Genny)
Alaskan Sea-Duction is offline   Reply With Quote
Old 02-20-2019, 10:34 AM   #16
Member
 
City: Ripon, California
Country: USA
Join Date: Feb 2019
Posts: 5
Much thanks to everyone!!!!
JerryD is offline   Reply With Quote
Old 05-29-2019, 10:07 AM   #17
Senior Member
 
Montenido's Avatar
 
City: La Paz, BCS
Country: Mexico
Vessel Name: Ansedonia
Vessel Model: Californian/Carver 52CPMY
Join Date: Dec 2014
Posts: 305
Hi Jerry,

I've got the Cat 52' with similar motors. I generally cruise at 9 knots, about 1500-1600 rpm. In variable conditions I get about 6.5GPH including generator use. I slowed to 7 knots for a day and dropped my fuel burn below 5GPH.

Let us know how it goes.

Cheers, Bill
__________________
"There is simply nothing more worth while than messing around in boats."
Montenido is offline   Reply With Quote
Old 10-07-2019, 01:53 PM   #18
Member
 
City: San Diego
Country: USA
Vessel Name: Athena
Vessel Model: 5539 Californian
Join Date: Nov 2017
Posts: 12
Fuel Burn

Quote:
Originally Posted by JerryD View Post
I'm trying to estimate fuel costs for a long transit in a 48 Californian Aft Cabin MY running 3208TA's. Speed around 8kts. Any help out there?
Thanks,
Jerry
Jerry:

I have a 55' CPMY with same 3208TA's. 8 -10kts is prime cruising speed and there are multiple factors in running. My manual also says that for every 2 hours at lower speeds you need to run at WOT for 2-3 min. I have a GPH meter but won't help you much as my set up will be much different than a 48 but for what it is worth I get 3gph at 8.2kts and 5.9gph at 10kts.
4blade1 is offline   Reply With Quote
Old 10-07-2019, 04:33 PM   #19
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,474
Quote:
Originally Posted by 4blade1 View Post
Jerry:

I have a 55' CPMY with same 3208TA's. 8 -10kts is prime cruising speed and there are multiple factors in running. My manual also says that for every 2 hours at lower speeds you need to run at WOT for 2-3 min. I have a GPH meter but won't help you much as my set up will be much different than a 48 but for what it is worth I get 3gph at 8.2kts and 5.9gph at 10kts.
So what you are saying is that you burn a total of 6 gallons in an hour when traveling at 8.2 knots and 11.8 gallons when traveling at 10 kts.
__________________

tiltrider1 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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





All times are GMT -5. The time now is 06:08 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×