What is your fuel consumption?

[kcrane]

Before taking the plunge into several vats of £6 a gallon diesel I'm looking for some guidance on real world consumption (in mpg as I am a bear of simple brain).

Assuming around 40-45ft with modern diesel engines (example boats in brackets), what would you expect at both low cruising speeds and, if the boat can do it, high cruising speeds from:

Single engined displacement (Linssen 40.9, Nordhaven 40)
Twin engined displacement (Grand Sturdy 410)
Single engined semi (Elling E3)
Twin engined semi (Broom 42)
Twin engined planning (Princess 42, Fairline 40)

 

[Wiggo]

Twin engine planing would probably be around 1mpg, I guess. RickP can advise on the Eling E3

 

[DavidJ]

The Fairline 40 consumption would not be far away from my Sealine S37 (because of the Sealines extra beam) which is 2mpg from twin KAD43's (230hp each). Cruising speed would be 25 knots'ish

 

[Garryt]

My F43 gives me about 1MPG at 20Kts or 20GPH...

 

[jimmy_the_builder]

Depends which Fairline 40 you're talking about. A Targa 40 will give you 2mpg; a Phantom 40 will be half that.

Cheers
Jimmy

 

[epervier]

an very old formula for fuel burnt at full throttle, used to be 1 pint for every 1/2 hp
therefore (for ease of maths) a 200hp will burn 100 pints of fuel = 12.5 gph x 2=25gph

how big's your tank, sea state, wind and tide, determines how far you get! /forums/images/graemlins/grin.gif

 

[enterprise]

The Fuel calcs can be done here, also good for rough passage planning.

http://www.passageplan.com/plan_a_route/fuel_calc.html

 

[nedmin]

Single engine displacement about 6lts an hour at 8kts

 

[Deleted User YDKXO]

Lard arse 46 footer 0.7mpg

 

[Medskipper]

Interesting website, I just put in fuel at £1.20 a litre and decided I had better sell the boat!! To get to Ramsgate and back from Chatham its going to cost me about £500. I don't even like Ramsgate!

Barry

 

[RogerRat]

So true, having just done the swap!

Princess 40 or Phantom 40, (flybridges on shafts) don't expect better than 1 Mpg.

Phantom 38 on shafts, touch better than 1 Mpg, 4-5 litres per per mile @ 25 knots.

Targa 40, D6s' on outdrives 3 litres per mile @ 25+ knots.

Not been out in flat seas yet! /forums/images/graemlins/mad.gif At easy 25kn, would expect 2 Mpg max.

If planing properly, Mpg should remain fairly constant between 23-33 knots (even though litres per hour will reduce) but obviously much lower if running over 35 knots. /forums/images/graemlins/cool.gif

Any news on yours yet Jimmy? /forums/images/graemlins/wink.gif

 

[[2574]]

Fairline Targa 39 cruising at 22kts does about 1.3mpg

 

[[2574]]

I reckon that the fuel calculator is a little optimistic!

 

[oceanfroggie]

<u>Broom 39KL/38CL</u>
2gph @ 7.5kt displacement speed = 3.8mpg
10gph @ 15kt economic cruise = 1.5mpg
15gph @ 20kt cruise speed = 1.3mpg

The SD hull form makes 15kt cruising a very attractive and economic proposition because the hull is truly well up on the plane at only 15kt, yet fast enough to cover long passages (I've done 150nm in single hop). Also at 15kt the engines are quiter and the whole boat feels very compfy in most seas. At 7.5kt the engines are almost silent and our fuel burn is tiny.

 

[Hurricane]

Sealine T51 - about .8 gals per mile per engine.
Princess 67 - who knows!!

 

[epervier]

"I don't even like Ramsgate" /forums/images/graemlins/laugh.gif /forums/images/graemlins/laugh.gif /forums/images/graemlins/laugh.gif

nice start to a deary day, a good laugh to start with

thanks

 

[PCUK]

Boats of that size seem to offer pretty much the same MPG whether planing or not. Reckon about 1 mpg and you won't be far out on any of them. Go very slowly and mpg rises steeply!

 

[rickp]

With semi-displacement boats like the Elling, its all about the speed. The faster you go the more fuel you slurp. At full chat, the Elling is a tad less thirsty as our previous flybridge boat in mpg terms. We find at our normal cruise its around 3litres/nm, and drops off the slower you go.

Rick

 

[kcrane]

[ QUOTE ]
<u>Broom 39KL/38CL</u>

[/ QUOTE ]

Interesting... and more attractive consumption than I would have guessed. Two further questions:

Which engines do you have and would you expect very different consumption if you had any of the alternatives?

What does the KL & CL mean? In fact, if you know the answers I'd be glad of some guidance on Broom models generally. The 42CL I think is a definate semi, whereas the 415 is planning, but leaning towards semi. The 450 and 50/530 I'm guessing are similar hull shape to 415?

 

[kcrane]

rickp - I'm sure I probably asked you this before, but what engine do you have in the Elling?

What speeds would you think of as: 1. displacement 2. steady cruising and 3. flat out?

Sounds like 15knts is your steady cruise?

What fuel consumption do you get in mpg at those three different speeds?