Fuel Burn
Hi All,
I am doing some preliminary work looking for a new boat but I’m really struggling to find a solution.
Most of my time is spent out at the trench either deep drop or dragging lures. So I do 70 mile round trips straight out and back most trips, often more when running lures.
I like the speed that outboard(s) provide but i am just not sold on twin outboards for the high fuel burn of twins, single outboard is obviously the best choice for straight line burn but diesels obviously kill them all for trolling. Mymate has a Caribbean 40 that used 2.9 litres / hr a side at troll speed (just in gear). Pretty amazing numbers , down side is is 55 lt/hr per side on the way out at 22 kts
I was wondering if everyone with access to fuel flow data would give me their fuel flow figures for normal cruise speed /fuel burn and then say 7 kts (troll speed) in the below format. Happy to share the end product if anyone is interested
Boat type
Length
Engine / Engines
Petrol / Diesel
Fuel Burn 7 kts
Fuel Burn 25 knots (or your cruise speed - please state the speed)
POB
Would be an interesting exercise all the same and would love some bigger boats too in the hope of getting a decent data set
Any help greatly appreciated
Southy
dodgy
Posts: 4563
Date Joined: 01/02/10
7m ally with Volvo diesel.
7m ally with Volvo diesel. 5 knots is just clicked in gear. 1.4lph. 7-8 knots im burning 4 lph. 25 knots I'm getting 22lph. Wot at 38 knots I'm at 40lph
Does anyone know where the love of god goes, when the waves turn the minutes to hours?
Luke
Posts: 167
Date Joined: 02/11/09
I'm running a 7.5m ali
I'm running a 7.5m ali walkaround with a tower with twin 175 Suzukis, its actually slightly better on fuel then my 7.2m glass boat with a single 300, the twin rig has a much higher cruise speed.
I'm using about 15L combined at 7 knots doing about 2000rpm. If its calm I can shut down one motor and use a little less fuel, this also halfs the hours you do trolling if you alternate between the motors. I big cost saving when you troll all the time, especially when a service is so expensive these days.
I cruise at anywhere between 22-32 knots using 1lt /km, so at 50km/h im using 50L combined. 60km/h im using 60lt combined. WOT is 44knots.
if you get twins make sure you go with a brand with digital throttles, you will get auto sync which stops all resonating through your hull and is much nicer to use.
A set of twins is roughly the same cost as a single diesel with a leg.
jdavies_99
Posts: 114
Date Joined: 24/07/11
My Boats
Boats I use as follows:
Boat type - Carribean
Length - 42 (1989)
Engine / Engines - Twin Detroit Diesels 6v92 450hp each side
Petrol / Diesel
Fuel Burn 7 kts - Roughly around 25lph at 8 knots
Fuel Burn 25 knots (or your cruise speed - please state the speed) - 110Lph at 18 knots
POB - Makes no real difference to be honest
NOTE: Above are estimates as this boat has no flow gauges. They should be reasonably accurate though.
Boat type - Carribean
Length - 49 (2015)
Engine / Engines - Twin Cummins QSM11 715hp per side
Petrol / Diesel
Fuel Burn 7 kts - Roughly around 12lph at 8 knots (not 100% sure on this one).
Fuel Burn 25 knots (or your cruise speed - please state the speed) - 160Lph at 26 knots
POB - Makes no real difference to be honest
Boat type - Sea Hunt Fibreglass Walkaround
Length - 23ft
Engine / Engines - 2006 4 Stroke Yamaha 150hp
Petrol / Diesel - Petrol
Fuel Burn 7 kts - Roughly around 18ph at 8 knots (not a particularly comfortable speed for this hull)
Fuel Burn 25 knots (or your cruise speed - please state the speed) - 23 knots and around 35lph
POB - 3
I can
___________________________
2006 Sea Hunt 23 Walkaround w/ 150hp Yamaha 2006
1989 Haines Hunter Legend w/ 225hp Pro XS Mercury 2013
2006 Savage 14ft w/ 30hp Yamaha
1990 Zodiac 12ft w/ 4hp Mercury
jdavies_99
Posts: 114
Date Joined: 24/07/11
P.s
I would be keen on reading the end product if you are compiling the information.
___________________________
2006 Sea Hunt 23 Walkaround w/ 150hp Yamaha 2006
1989 Haines Hunter Legend w/ 225hp Pro XS Mercury 2013
2006 Savage 14ft w/ 30hp Yamaha
1990 Zodiac 12ft w/ 4hp Mercury
southpoint
Posts: 47
Date Joined: 30/03/11
Great stuff guys
Keep them coming please
eziliving
Posts: 865
Date Joined: 30/12/09
8.0 mtr Ali with twin 250
8.0 mtr Ali with twin 250 Yamaha 4 strokes.
7 knots around 15-17 litres
25 knots around 63ltrs
wot at 48knots 162ltrs
Get busy living, or get busy dying!
t bone
Posts: 351
Date Joined: 20/04/14
7.3m Ali with Suzi 250.
Very interesting numbers so far. I only have my cruzing speeds at the moment, but home in few weeks and will get others if your still interested by then.
20kn (3400rpm) running @ 27LPH - showing 1.4ltr/Nm
24kn running at 38.6LPH - showing 1.5ltr/Nm
27kn running at 48.4LPH - Showing 1.8ltr/Nm
pelagicyachts
Posts: 1301
Date Joined: 23/02/11
The Carribean 40 doing 4 l/h
The Carribean 40 doing 4 l/h per side sounds very lean! - I wish!
rough numbers below
Boat type - Flybridge convertible- 42ft
Engine / diesel - Twin Caterpillar 3208ta (435hp ea)
Fuel Burn 7 kts - circa 20 -25 l/h at 8 knots
Fuel Burn 25 knots - around 160l/h at cruise (20-22knots) and around 180+l/h at 25 knots
POB - 6 usually but as jdavies says it doesn't affect the numbers
have you thought about going for a large single o/b and getting a "kicker" for trolling? - very popular in florida and I have seen set ups where the kicker (around 15-25hp) is linked up to the steering on the main o/b - when not in use it has the leg up and is out of the way - also some comfort in terms of safety - slow trip home but most twin eng boats cant get up on the plane on a single anyway
cheers
Jaaayoo
Posts: 11
Date Joined: 16/03/14
Try having a look through
Try having a look through these mate
www.australianboatmags.com.au/sea_library/engines_drives.php
Ashram
Posts: 134
Date Joined: 23/10/09
Fuel Burn
My boat
Boat type - Wellcraft
Length - 27ft
Engines - Twin 225 Yamaha 4 Strokes
Petrol
Fuel Burn Trolling between 8-11knts 20 LPH (combined)
Fuel Burn Cruising speed between 22-24knts 85-90 LPH (combined)
Fuel Burn WOT 37-40knts 165-170 LPH (combined)
POB - Makes no real difference
Cheers
Doc
Posts: 691
Date Joined: 29/05/16
Not a boat, but our
Not a boat, but our motorhome gets 4-4.5 kilometres per litre. Depends on speed (100kmh) and headwind.
pelagicyachts
Posts: 1301
Date Joined: 23/02/11
that's better than my troopy!
that's better than my troopy! :-)
Doc
Posts: 691
Date Joined: 29/05/16
That's about 22.2 litres per
That's about 22.2 litres per hundred, my landcruiser V8 diesel is good for 14-15.
Yewiefish85
Posts: 780
Date Joined: 02/01/11
wish my cruiser got 14-15
wish my cruiser got 14-15
Doc
Posts: 691
Date Joined: 29/05/16
99% of my driving is at
99% of my driving is at 110kmh and into towns, I'd hate to see what it would be in the city. It's also just a tray back.
Yewiefish85
Posts: 780
Date Joined: 02/01/11
i have a 76 wagon, i get
i have a 76 wagon, i get better economy around town than when out on the highway, 5th gear is just too short, probably doesnt help with the size of tires i run
Doc
Posts: 691
Date Joined: 29/05/16
Hey yewie, yeah ours is bog
Hey yewie, yeah ours is bog standard, just a couple of years old. Hauls pretty hard, but as I said, just a 5 speed manual, but just ticks over in top gear at speed.
meglodon
Posts: 5981
Date Joined: 17/06/10
That's better than my patrol
I'd like to be getting those figures.
Stevo81
Posts: 1278
Date Joined: 16/04/12
Boat type - Hydra-Sports
Boat type - Hydra-Sports 2500VX
Length - 7.8m
Engine / Engines - Twin Yamaha F150's
Petrol / Diesel- Petrol
Fuel Burn 7 kts - Never noticed but will check
Fuel Burn Cruise -26kts @ around 52-57litres/hr combined-depending on how much trim tab im using
POB - Makes no real difference
WOT - 40kts and never noticed either. A fkload!
•••••••• Electrical Contractor NOR ••••••••
Vinesh87
Posts: 2751
Date Joined: 02/04/11
7.5m Ally 300 Yammy 1.2km/l
7.5m Ally
300 Yammy
1.2km/l at 23-24knots loaded
1.5km/l about 8 knots
Have had her very very loaded and it does not change that much!
36knots WOT no idea how much fuel haha
southpoint
Posts: 47
Date Joined: 30/03/11
Thank you everyone for your input
Please keep them coming
Any one esle with diesels??
mullows
Posts: 738
Date Joined: 25/12/08
Hey mateI got a seaswirl
Hey mate
I got a seaswirl 2601Wa with a volvo penta 225hp d4 and cant give you specific figures but like dodgy says above I can get it going pretty quick at 35kts WOT.
Did the Dampier classic a few years back, went out the Thursday night and finished the Monday arvo, no need to refuel so stayed out the whole time with just the runs back to ramp to hand in tags etc. The figures that I can give you is we did 300 nautical miles for 400 litres used, varied speeds with 4 blokes on board + all our gear, piss and food. pretty good really.
Cheers
Mullows
The Older I get the better I was :-)
dodgy
Posts: 4563
Date Joined: 01/02/10
Can still get good speed out
Can still get good speed out of a modern diesel. Mine will run up to 38-39 knots which is way faster than anyone is usually able to travel at off wa
Does anyone know where the love of god goes, when the waves turn the minutes to hours?
Dean78
Posts: 40
Date Joined: 05/01/15
No meter bit can offer a guide
fibreglass boat - commodore 670
length 6.7m
200hp Mercury Optimax
Petrol
40nm round trip (20nm each way, 50 mins) @ around 24knots, normally use 75-80l.
2l per nm
48l per hour
Cruise Control
Posts: 971
Date Joined: 03/11/10
Cruise Craft Outsider 685 - 2
Cruise Craft Outsider 685 - 2 x 115 Yamahas 4S
Troll @ 6 kts = 11LPH
Cruise @ 22 - 24 kts = 38LPH
bsir
Posts: 569
Date Joined: 24/04/11
Cruise craft explorer
685 explorer, 250 hp 4 stroke Yamaha.
consistently average 1km per litre. Normally driving at 25-28 knots, but do drive to the conditions. Between 18 to 28 all about the same.
it gets better at 8ish knots but haven't paid too much attention, I think 1.2 to 1.4 km per litre.
WOT can scratch 40 knots on a glass off. Seen this using 90 lph.
fishcrazy
Posts: 1235
Date Joined: 27/01/07
cruise craft 550
Got a 550 outsider 115 mercury 4 stroke WOT uses about 40 lt per hour get about 110 kms from approx 80 litres or half tank @26 knts approx love the range and the cost at bowser
bouttime
Posts: 703
Date Joined: 27/07/06
Boat 6.5mtr Oceanic centre
Boat 6.5mtr Oceanic centre cab
200hp v6 yamaha 4 stroke
7knts @2000rpm about 10lts/hr
20knts @3500rpm 25lt/hr cruise speed
25knts @4000rpm 30lt/hr fast cruise speed
30knts @5000rpm about 40lts/hr
WOT 35knts and about 70lt/hr
Usually 3 to 4 peaople on board
Overall average for a days fishing about 1.3km per lt
Griffo84
Posts: 118
Date Joined: 28/05/10
Trailcraft - Pro fish 5.35m side console
Engine - 75hp Mariner 2 stroke
Haven't got too much info about fuel burn at different speeds, however, at 20-25knots I get around 1.8km's per litre.
Do the right thing and there will be fish tomorrow.
resurgence
Posts: 573
Date Joined: 23/04/14
Cabo 32
Cabo 32 Express
Twin Cummins QSB 5.9, 425hp each
Troll 6-7 knots - 12-14lph
Cruise 24 knots 105lph
WOT 34 knots about 180lph
POB makes no difference.
JohnF
Posts: 2836
Date Joined: 07/07/10
Boston Whaler 235 (7.35m),
Boston Whaler 235 (7.35m), single Verado 250.
1 km/L from 18-25 knots, gets thirstier faster than 25 knots.
Boston Whaler 235 Conquest......getting the flogging it was built for.
southpoint
Posts: 47
Date Joined: 30/03/11
Anyone got a Caribbean 35 with Cummins?
Would be interested
Or a Contender 28-31
Stevo81
Posts: 1278
Date Joined: 16/04/12
Shitloads of Contender
Shitloads of Contender performance #s threads on The Hull Truth
•••••••• Electrical Contractor NOR ••••••••
jng
Posts: 488
Date Joined: 03/08/07
Got a 7.5m ally hardtop with
Got a 7.5m ally hardtop with a 250hp Suzuki average 1litre per km average cruising speed of 20-25knotts