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04 April 2008, 17:12
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#1
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Member
Country: UK - Scotland
Town: Huntly
Make: Searider 4.7
Length: 4m +
Engine: 75 Suzuki
Join Date: Oct 2004
Posts: 186
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Atlantic 21
There is one for sale on ebay at the moment 2nd time round, is this not a bit under powered?
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04 April 2008, 17:52
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#2
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Member
Country: UK - Scotland
Town: Oban (mostly)
Make: Ribcraft, Humber,BWM
Length: 5m +
Engine: Outboards
Join Date: Jan 2008
Posts: 632
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Quote:
Originally Posted by ALANT
There is one for sale on ebay at the moment 2nd time round, is this not a bit under powered?
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What have they got on the back? (I haven't bothered to check ebay - feeling lazy!) When I was on a 21 in the 70s, we had twin 50s (the first boats only had 40s, they were definitely underpowered) and they were OK for lifeboat work but not very zippy for playing about
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04 April 2008, 17:57
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#3
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Member
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,951
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well I thought the fuel tanks were a little small, but since he has managed 150 hours but only needed to fill it up a couple of times then obviously it's very economical.
I drove a 6.5m Ribtec with those engines for Stu once and only once, dreadful, the only reason we did 26 knots was the tide was going out  Oddly enough he has a pair of Opti 150s which would go well on the back of this.
Pete
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06 April 2008, 19:29
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#4
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Member
Country: UK - Wales
Make: XS // Delta
Length: 6m +
Engine: 60hp // 2x90hp
Join Date: Feb 2007
Posts: 213
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That boat looks wierd, especially the placing of the frame and the jockey seat 
anyway, our atlantic 21 has twin mariner 50's but they're two stroke rather than four stroke which would make a difference.
Don't forget that all atlantic 21's & 75's had/have two strokes fitted, and its only the Atlantic 85 where they have moved to fourstrokes, but upped the power to 115's
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06 April 2008, 19:30
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#5
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by TonyC
anyway, our atlantic 21 has twin mariner 50's but they're two stroke rather than four stroke which would make a difference.
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Will yours make 32 knots?
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06 April 2008, 19:34
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#6
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Member
Country: UK - Wales
Make: XS // Delta
Length: 6m +
Engine: 60hp // 2x90hp
Join Date: Feb 2007
Posts: 213
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Quote:
Originally Posted by Nos4r2
Will yours make 32 knots?
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to be honest, i have no idea - i've never run it with a gps onboard, but it does shift.
You've given me a mission for this week now. just gotta find me a portable gps
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06 April 2008, 19:40
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#7
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by TonyC
to be honest, i have no idea - i've never run it with a gps onboard, but it does shift.
You've given me a mission for this week now. just gotta find me a portable gps |
 I thought 32 knots sounded a bit optimistic from the one on Ebay.
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06 April 2008, 19:48
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#8
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Member
Country: UK - Wales
Make: XS // Delta
Length: 6m +
Engine: 60hp // 2x90hp
Join Date: Feb 2007
Posts: 213
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Quote:
Originally Posted by Nos4r2
I thought 32 knots sounded a bit optimistic from the one on Ebay.
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That does sound a bit steep.
As far as I can remember, when the 21's had twin 50's they were specced at doing 29 knots with 3 people on board.
I think when they upgraded them to twin 70's, it only pushed that up to like 32 knots.
If I can get a portable gps from someone tomorrow, i'll do a speed test as im using the boat tomorrow.
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06 April 2008, 19:59
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#9
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Member
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,951
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Quote:
Originally Posted by TonyC
anyway, our atlantic 21 has twin mariner 50's but they're two stroke rather than four stroke which would make a difference.
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Really, why is that then ?
Pete
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09 April 2008, 15:51
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#10
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Member
Country: UK - Wales
Make: XS // Delta
Length: 6m +
Engine: 60hp // 2x90hp
Join Date: Feb 2007
Posts: 213
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Quote:
Originally Posted by Pete7
Really, why is that then ?
Pete
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slightly lighter engines?
Found a portable GPS, and ours will do 29/30 knts WOT
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