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Old 16 March 2011, 21:23   #1
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Atlantic 21 - how much power?

http://cgi.ebay.co.uk/Atlantic-21-RI...item4157b2c6b2

I really like the look and layout of this one on Fleabay, but twin 60's seem a bit scant. Is it even a worthwhile prospect?

Thnx
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Old 17 March 2011, 03:28   #2
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Originally Posted by ooglewoogle View Post
http://cgi.ebay.co.uk/Atlantic-21-RI...item4157b2c6b2

I really like the look and layout of this one on Fleabay, but twin 60's seem a bit scant. Is it even a worthwhile prospect?

Thnx
They had twin 50's when they first went on service IIRC then 60's....someone like Martin (mchappelow on here) is a mine of knowledge re all things Lifeboat and could give you the proper /actual specs, but with twin 60's should do 30 knotts...

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Old 17 March 2011, 04:53   #3
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If it was mine I'd stick twin 90's on it or a single 150.
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Old 17 March 2011, 05:36   #4
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They had twin 50's when they first went on service IIRC then 60's....someone like Martin (mchappelow on here) is a mine of knowledge re all things Lifeboat and could give you the proper /actual specs, but with twin 60's should do 30 knotts...

Former boss of mine had an ex RNLI one with twin 55 2 cylinder Evinrudes. Did 33 knots.
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Old 17 March 2011, 11:06   #5
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Thanks for replies all. Will see how the auction goes. One of these puppies with twins would be perfect up here in the Hebrides.
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Old 17 March 2011, 11:12   #6
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Find out the max design HP and whack it on there.

At 6.5m it should be in the 175-200 region for a single.
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Old 19 March 2011, 10:46   #7
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Quote:
Originally Posted by Razorbill RIBs View Post
They had twin 50's when they first went on service IIRC then 60's....someone like Martin (mchappelow on here) is a mine of knowledge re all things Lifeboat and could give you the proper /actual specs, but with twin 60's should do 30 knotts...

I know this will really date me, but when I served on a 21 it had twin 50s. It did us pretty well at the time, but the move to 60s certainly improved it. 30kn may be a bit optimistic for an old boat, but 25+ should still be well within scope.

In your part of the world, twins gives good reassurance, and I agree with Chewy - 90s would work well when the time came to change

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Old 19 March 2011, 14:12   #8
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Untill recently, our boat had twin 50 2stroke mariners on it, and I clocked it at 29 knots max.
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Old 20 March 2011, 13:47   #9
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When I bought mine it had 2 x 50 evinrudes on her. She could do 28knts. So I swopped them for 2x 75hp Yamaha Pro and now she clocks 36.5knts. A great boat. Go for it!!!
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Old 19 May 2011, 10:37   #10
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Kinda on topic- Does anyone with experience on atlantic 21s or atlantic 75s know how the performance is running on one motor? Will the boat plane? and how fast would it go?
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