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Old 20-08-2006, 10:37 AM   #1
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Diesel's.

I am toying with the idea of a 35 foot monohull project for regular trips to France & the Channel Islands.

This would really neccessitate the use of twin diesel engines for reasons of fuel economy.

What diesel engine options are there for something like this? And what else should i be taking into consideration?

Raw cooled or closed system?

Weight?

Power?

I am thinking along the lines of a Formula 357 or similar.
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Old 20-08-2006, 10:39 PM   #2
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It all really depends how fast you wanna go.

It's easy and cheap to go slow!
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Old 21-08-2006, 05:08 AM   #3
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I was thinking of two 320'ish hp Diesel motors.

What kinda speed do you think that will provide Jon?

What kinda fuel costs do you think leviathan would use on a french day trip?

What is the difference in weight between petrol and diesel fuel?

I guess a Formula 357 with diesels would weigh around 5000kg with full tank. (Guesstimate).
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Old 21-08-2006, 06:29 AM   #4
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Actually, thinking about it i dont think a pair of 320hp diesels will be enough for a 5 ton boat.

Looking for a top speed of 70 plus, but a comfortable and economical cruise speed of 50 - 55mph.

Our son his wife and two young children live in France, thought it would be nice if we could pop over on a friday afternoon and collect them all and run on round to Guernsey for the occasional weekend.
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Old 21-08-2006, 08:35 AM   #5
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You've got your work cut out getting a Formula 357 to do 70 on petrol, let alone Diesel!

They're a big, heavy, deep 'V' boat. I'd estimate that you'd need an absolute minimum of 500hp per side to do 70 in one.
Matt's 29 footer, with an honest 300hp/side does 62, it would probably need 400hp/side to do 70, so add six feet, and 1.5 tons.........

In my 28, and In reasonable weather, Southampton to Cherbourge and back (bout 150 miles) cruising at 60mph would cost IRO £120 at current prices (0.47p/litre) compared to the same trip in '98 when red was just 0.19p/litre, when it would have cost under £50!

Matt seems to use roughly 5 or 6 times as much for the same journey in terms of cost, and that's filling up from the roadside petrol station at £1/litre, as apposed to £1.12 a litre at the dock!

I 'think' he used 380 litres for the June poker run, and we covered 72 miles, I covered slightly less as a commitee boat, but towed a boat 25 miles home after it broke down and used about 65 quid's worth (130-140 litres-ish)

Of course, this will all change if we lose the cheap red in December!
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Old 21-08-2006, 08:54 AM   #6
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Cheers Jon.

As i have not been following the Diesel fuel issues whith much interest, what is likely to happen to the cost in December assuming the worst scenario?

So if i need big power diesel's, what are my options regarding manufacturers Jon?
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Old 21-08-2006, 08:55 AM   #7
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Yep dont you love the wording "It is the intention to apply"
Would rather have seen something more positive like "we are going too" or "we have".

If they dont Diesel prices going through the roof for red users huge swing back to petrol I suspect
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Old 21-08-2006, 09:19 AM   #8
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Quote:
Originally posted by Turnip1
Cheers Jon.

As i have not been following the Diesel fuel issues whith much interest, what is likely to happen to the cost in December assuming the worst scenario?

So if i need big power diesel's, what are my options regarding manufacturers Jon?
To be honest, I think the cost of diesel power big enough to get a 357 moving, would be prohibitive.

440 Yanmars, Konrad drives, not even sure what gearboxes! probably at least 60-70k for the mechanicals alone. A lot of dosh to to spend on an old 357.

It'd be interesting to see how quick one would go with a pair of 315 Yanmar packages, perhaps 50mph.

Complete warranted engine/drive packages would then cost IRO 40k
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Old 21-08-2006, 09:19 AM   #9
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I've got the spec sheet for the 357 with various power options, I'll see if I can find it.
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Old 21-08-2006, 09:23 AM   #10
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Seems about right

Quote:
Originally posted by Jon Fuller
You've got your work cut out getting a Formula 357 to do 70 on petrol, let alone Diesel!

They're a big, heavy, deep 'V' boat. I'd estimate that you'd need an absolute minimum of 500hp per side to do 70 in one.
Matt's 29 footer, with an honest 300hp/side does 62, it would probably need 400hp/side to do 70, so add six feet, and 1.5 tons.........

In my 28, and In reasonable weather, Southampton to Cherbourge and back (bout 150 miles) cruising at 60mph would cost IRO £120 at current prices (0.47p/litre) compared to the same trip in '98 when red was just 0.19p/litre, when it would have cost under £50!

Matt seems to use roughly 5 or 6 times as much for the same journey in terms of cost, and that's filling up from the roadside petrol station at £1/litre, as apposed to £1.12 a litre at the dock!

I 'think' he used 380 litres for the June poker run, and we covered 72 miles, I covered slightly less as a commitee boat, but towed a boat 25 miles home after it broke down and used about 65 quid's worth (130-140 litres-ish)

Of course, this will all change if we lose the cheap red in December!
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Old 21-08-2006, 09:24 AM   #11
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diddy turbines................we know it makes sense dont we Matt
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Old 21-08-2006, 09:24 AM   #12
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Yeh. Have you found me a pair of Isotov GTD-350's yet?
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Old 21-08-2006, 09:27 AM   #13
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I'd love a turbine 'project boat', but don't think they'd be all that practical as an everyday lesure boat. Wife, dogs, marina, coastgaurd etc!
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Old 21-08-2006, 09:31 AM   #14
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I don't think any of our boats are really "everyday" leisure boats in this country unless you buy a slow thing from a showroom with a warranty & patio doors.
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Old 21-08-2006, 09:35 AM   #15
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You know what I mean.
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Old 21-08-2006, 09:37 AM   #16
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There are a couple sitting in an old gunship thingy just near Yamosukro last time I was there but I wasn't stopping...............

Turbines are the way of the future it's just addressing the gearbox drive issues. Dont know jack about building & desiging gearboxes. That said I did sell the GTC85 to a new loving home where is being converted to an Air Start Unit
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Old 21-08-2006, 09:42 AM   #17
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Depends. If you're referring the prospect of a divorce, then yeh, I know where you're coming from.

Quote:
Originally posted by Jon Fuller
You know what I mean.
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Old 21-08-2006, 09:52 AM   #18
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Quote:
Originally posted by BluFin
Turbines are the way of the future it's just addressing the gearbox drive issues.
mmn, the noise is a big deal, and the over rev issue, and the fact that the fuel consumption is high, regardless of what speed you're travelling, or even idling.
Diesel is the way forward, with the modern common rail systems, I'm sure there's loads of fancy things on it's way.

My Bro turned up a few days ago in a noo 407 Pug, V6 diesel, same motor as new Jag 'X', and range rover sport. so feckin quiet! sounded like a petrol with slightly noisy tappets! and goes like stink.
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Old 21-08-2006, 10:21 AM   #19
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Keeping boats in perspective the 727 I babysat ballparks at
18238 ltrs for the first hour then reduces by 2000 lts an hour until reaching 16000 lts per hour where it remains constant......
Used to stick it on the Credit card fek did I have some points
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Old 21-08-2006, 10:51 AM   #20
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Bloody eck!

I just nip out for a copy of Powerboat magazine and your all talking about turbines!

Matt youd luv the model turbine engines they sell here. Cant remember if they are 18,000 or 1,800 Dirhams, thats 2,700 or 270GBP.
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