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Old 07 January 2003, 19:34   #31
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Quote:
Originally posted by Alan Priddy
Of course I would have to fit a bloody big self righting bag to turn it over when it broached in a big following sea and lost drive !
Alan - are you saying this is a pitfall of jet drives (i know very little about them, and nothing about their characteristics)?

If so surely this is somewhat of a problem for the boys re-tracing you're tracks accross the atlantic?



Julian...

What boat did you have twin 300's fitted into? A RIB?

Daniel
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Old 08 January 2003, 03:25   #32
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The problem with a jet drive in BIG SEAS is the wave coming from behind tends to hit the boat a mid ships and lifts the transom out of the water. The boat is already running down hill like a runaway train only to find out it has no drive, no steering and is at the mercy of the wave pattern when it gets to the bottom. This is when the boat is liable to broach. It is not for me to say if "Team Youth" will have a problem, depends on how big the Atlantic seas are. Alan P
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Old 08 January 2003, 04:12   #33
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2 Yanmars

Morning Daniel

Yes it was a Rib. It was a scorpion 9.5mtr with twin 300 yanmars driven through Bravo 1 drives. It was a very fast boat but not practical with that much weight in the back and every time you had a service done they had to crane the engines out to get at them as there was no room.

Ended up being very expensive but was good fun for a while.

Julian
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Old 08 January 2003, 10:36   #34
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I also believe that jet drives are developed for specielist applications EG people in the water rescue situations,Customs dont want to wave , at a drug runners who are using a jet boats and then watch them cross a shallow piece of water and be home before the customs vessel can catch the Damm skallywags.
Beaching a boat on a navy ship etc etc and so on.

They require approx 30% more power and fuel for the same at the prop,as a outdrive engine combination.

Im real interested weather the rnli have adopted them for there rescue boats as they have been tested but as far as Im aware aint been taken on?, for the same reasons that Allan has said.

Too skitty in real bad weather, and loose to much power and weight and room in the boat,and with a Jet and box and engine cost for a single 300hp at the prop equivilent can be 15k just for the Jet? Then add the extras like an engine ?

Crazyhorse
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Old 08 January 2003, 10:42   #35
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Ummm.. strange, i posted a reply this morning which is not here. Crasyhorse your's is here twice! have you hijacket it???

Anyway, what it said was something like how nippy the twin 300 of julians must have been, how envious i was of that and also to itterate how, that like Alan i am not wishing to quesiton the 'team youth' attempt, infact i wish them all the luck in the world.

Anyway, the RNLI have a jet boat on the thames, mored at Chiswick pier, had quite a good look over it when i was moored there over the summer (with they permission!). Strangly it had a completly open transom too.

I've had a run-in with the customs Jet boat, out ran them for a while (pretended i dident see them of course ) but they caught up as i entered the harbour. The rest, as they say, will be told once beer is in flow!

Daniel
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Old 08 January 2003, 10:50   #36
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Sorry Daniel I havnt hijacked your post as I was reading it and your right it isnt here.JK can you get Danniels post back as I have responded to it and it has dissappered.

Im sure your second post Daniel ist the same as your current post?

Bemused Crazyhorse
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Old 08 January 2003, 11:00   #37
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I look forward to a beer Daniel for sure.The point Im making about jets is in open Sea conditions,

Im aware of the Thames Rnli boats.Im not being rude but these boats are designed for the Thames and not open sea conditions.

Looking forward to your tale of customes apprehension on the high seas?,
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Old 08 January 2003, 11:01   #38
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How on earth did you manage that? Are you in my house? ARRRGH.

Anyway, an interesting point is how we all (myself included) assume JK is like Big Brother - always watching, and when we say "JK can you make the tea" he will. In reality, of course, he is watching, and he does reply, very promptly! Mines white with two.

Daniel
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Old 08 January 2003, 11:04   #39
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The tale, infact, involves getting stoped THREE TIMES on seperate occasions. Two far more interesting than the other! And no, before you ask, i know nothing about white powder, beer or any other desirable product be it banned or more expensive than europe in the UK!
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Old 08 January 2003, 12:03   #40
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Daniel

I don't know what happened to your lost message. It seems to have sunk without trace. I didn't even see it

Anyway, get away from that wretched computer and drink your tea before it gets cold.

John
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