fuel consumption?

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epervier

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Any ideas on how much fuel a triple engined (AQAD42-230hp DP) 46ft Sunseeker Apache would burn per hour?
Is it a simple equation of, if you know what a twin will use in a 39ft craft, add a third, or more likely far more complex than that?
The boat is priced at a bargain price, but can I afford to feed it?
 
If you can find the fuel consumption of a single engine then you can multiply by three.

An engine will burn a set amount of fuel regardless of what it is doing, unless it is overstressed of course.
 
I think wot he meant to say that if an engine is correctly propped, then an engine won't "know" that it's one of three in a Squeeker 39 any more than it knows that it's the only thing pushing a Sealine 24.

So, provided not massively underpowered, the guesstimate figures for one engine can probably be multiplied up.

Still sounds a bit scary to me, though. THREE outdrives to antifoul each year and keep from dissolving. SIX propellors to replace if you run aground. SEVENTY TWO valves to be adjusted. 33 Litres of oil to change...

dv.
 
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Think your talking crap, but I will leave it to some one else to give the tecnical answer!!

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Quite!

Flat out 3 engines will burn the same as one engine flat out multiplied by three.

However at cruising speed this will not be the case as all three engines will be running on less throttle than if two engines.

However, three engines will be less efficient than two due to appengage drag of three legs in the 'oggin.

Pete
 
Were getting tied up in knots here.

If the same Squeeker had two engines, it would be have lower pitched props, and would have a lower cruise speed, and you'd be happy running at that reduced cruise speed, not whammoing the the throttles to keep up with some non-existant 3-engined monster.

Similarly the appendage drag thing is valid if you're comparing two more powerful engines to three more weedy ones. Which we're not, as they didn't make D6-350's in 1994...

dv.
 
Course, on the other hand, you could use two outer engines to move out the marina, just the middle one down the river. Then a choice of two or three engines at sea depending on conditions.

Alternatively, you could use the third engine for spares, which might be the best answer. /forums/images/graemlins/crazy.gif
 
Unbolt it and chuck it over the stern when you need a second anchor?

I would estimate 30 something litres an hour for an AD42. Which means 100L/hr at a reasonable cruise for the six propellored monster.

dv.
 
re price..maybe you should wait for the outcome on red diesel..coz if you are worried now, you might be petrified later (and so would any other buyer)!
 
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SEVENTY TWO valves to be adjusted.
dv.

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You must be talking about a 6 engined Sunseeker!!! As every 42 I've worked on only had 12 valves x 3 = 36. You are thinking of KAD 44's and 300's.
 
Are you sure fuel is an issue ?

An Apache has 46 feet of annual berth fees and 46 feet of visitor berth fees to pay. For similar accommodation to a 30 foot Sealine !

At the end of a season how many hours will you have cruised at 25-30 knots ?
Most engine hours are in the Harbour at tick over unless you have a cheap mooring or swing you could be looking at £12 k berth/lift out fees and £2k in fuel.

I best stop now before I convince myself to buy a Petrol Bayliner /forums/images/graemlins/cool.gif
 
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