Miles to the gallon?

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I'm currently looking to buy my first boat. What fuel consumption can I expect with a 26' Sealine 260, circa 2.5 tons, planning hull fitted with single Volvo Ad41 with DP (200 hp)? As the boat will be river based, 75% of my crusing with be 3-4 knts, and only 25% of time at planning speeds?

can any body with similar craft give me some idea at both speeds?


Cheers
Noviceboater
 
3-4 knots will be idle speed to maybe 1100 rpm - at this speed the service condition of the engine will have a significant impact on consumption 'cos it's not really using much at all - but if it's not burning cleanly ........however, in either case it's going to be negligable consumption around the 1 gph at idle good engine to 2 gph at 11/1200 rpm poor engine but you should measure it off if you are really interested!.
Planning is a different matter and will depend on many more factors but 2500 rpm should be fully planning and use in the region of 5 - 6 gph. Volvo will publish graphs somewhere in their technical specs.
Hope this helps
 
I personally don't like Gph, as a measure. If it helps, I have 2 X aq41's on duo's / 7.5 tonnes (dry)
I get between 1.9 & 2.5 (N)M.P.G.
This is at sea, at planing speeds. I would guess about 3.5 (N)M.P.G at river speed on my boat.
I would imagine somewhere about, maybe, 2/3 of these figures for yours??

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Incidently, If mainly river, why not go for smaller engine??
In any case I wouldn't get to hung up on fuel consumption, not @ 28p / ltr.

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I used to have a Sealine 240 which did about 2 mpg. I strongly recommend that you try your Sealine out on the river before you purchase because at low speeds with a side wind it was like a leaf on the water. its not until you get to 5 knots with this type of planning boat that you start to get under control in my opinion.
David
 
May I suggest that as long as the boat is diesel powered, then don't worry aboat the fuel comsumption. Make sure the wife likes the carpets, curtains, and upholstery. Make sure you have enough up to date toys to play with as if you hav'nt you will spend a fortune adding them after. Stock up with lots of mags and visit lots of web sites to reenforce how well you did when you bought the boat for next to nothing, you will need to keep all this info for when you start looking for your next bigger boat. on arrival start worrying about what is rotting, rusting leaking, out of date, there will be a lot to worry about but not fuel if it is a diesel
 
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