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Old 11 January 2004, 16:23   #1
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Country: UK - England
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Boat name: Ballistic
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New ILB's

I read in RIB International that the last Atlantic 75 has been made.

The gossip i heard is it's replacment is an 8.5mtr version which will be fitted with a pair of restricted Yamaha 90's. The idea of the restriction is that they are not being operated at full whack all the time.

Anyone know more?
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Old 11 January 2004, 18:21   #2
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Hi Daniel

Don't know about the 8.5 mtr - but a mate of mine is helm at Gravesend LB Station will ask him tomorrow.

He was saying that that they are looking at the new FRB to replace the tigers over the next year - but sea trials still ongoing....
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Old 11 January 2004, 18:59   #3
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Restricted 90 hp

Restricted 2x90 hp sounds like too little power for 8,5 metre hull. I'd say something like dual 120-130 hp with restriction might be suitable and give out around 32-34 kn maximum constant speed. I don't believe the RNLI wants 25-30 kn speed from their larger RIBs what would be the case most likely with 2x90 hp restricted...interesting idea though. These are just my opinions, not any official info, but under 100 hp engines sounds like too little power.
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Old 12 January 2004, 03:57   #4
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Re: New ILB's

Quote:
Originally posted by Daniel
which will be fitted with a pair of restricted Yamaha 90's.
Most 75hp's are de tuned 90's anyway?
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Old 12 January 2004, 06:04   #5
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Re: Restricted 90 hp

Had a play with an ex RNLI Atlantic 21 a few years ago and that made 32 knots with a pair of 60hp Evinrudes. The wide flat at the base of the V makes a relatively easy hull to propell and the boat is light at approximately 1000kg all up.

Also, these boats are thoroughly developed and tested and the LCG can be put in the right place and so it might be possible.

More power means more weight needs more fuel + more weight + needs more power. Light is fast if you can build it string enough!




Quote:
Originally posted by Pitkis
Restricted 2x90 hp sounds like too little power for 8,5 metre hull. I'd say something like dual 120-130 hp with restriction might be suitable and give out around 32-34 kn maximum constant speed. I don't believe the RNLI wants 25-30 kn speed from their larger RIBs what would be the case most likely with 2x90 hp restricted...interesting idea though. These are just my opinions, not any official info, but under 100 hp engines sounds like too little power.
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Old 12 January 2004, 06:34   #6
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At the bottom of the page there is load of pictures of the new one

FIB1
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Old 12 January 2004, 07:03   #7
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Boat name: Jane L
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My interest in RIBS began with the Peel lifeboat, an Atlantic 21 (B536) which was fitted with twin evinrude 50s in 1981 and I have spent many uncomfortably wet hours in them since!
Our last Atlantic 21 in 1989 was powered by 70s I think.

We've run a Mersey since 1992, but I can tell you that few decisions have been made about the Atlantic replacement, currently known as FIB1.

It will basically be a bigger version of the Atlantic, probably 8.3 metres long. It will have four crew seats. I understand that engine size has yet to be determined, and the two or four stroke decision has not yet been made, but you can be certain that whatever it is there will be two of them.

I think that the latest engines to be tested were 115 fourstrokes.

I hope this helps.


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Lifeboat Operations Manager
Peel, Isle of Man
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