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Old 01 April 2015, 13:25   #1
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Country: Iceland
Length: 6m +
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Atlantic 21 new engine

Hello Guys

I am about to pull the trigger on buying an Atlantic 21 with no engines and i have few questions.

The boat has no engines.

Itīs a pretty complicated situation but i have to buy the motor before i buy the boat. Dont ask.

The engine im buying is a Yamaha 200 HPDI with a 25" leg will that work on a Atlantic 21?

Raise the transom?

Havent found any definitive info on transom length on those boats.

More questions will follow after this has been answered.

Any info appreciated.
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Old 01 April 2015, 16:56   #2
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Country: UK - England
Town: Bridport
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Make: Halmatic
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Engine: Outboard
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Posts: 273
I no of a pair off 130 optimax engines that wer removed from a a22. Ģ2500 ish
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Old 01 April 2015, 17:39   #3
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Town: N. Pembrokeshire
Boat name: Various
Make: RIBs & Hovercraft
Length: 9m +
Engine: Outboards
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Hi, the Atlantic is set up for 20 inch (L) shaft.... Twins usually, with threaded studs set in the hull to take the lower fixings on the outboard saddles....

The xl would be doable with a built up transom, and I guess if you could make it mechanically strong enough you could retain an 'open' transom either side of a single (the open transomless design being a key feature of the Atlantic boats).

I guess it's up to you whether it's worth the work etc.... Ben Taylor on here has a 21 with a single Honda 225 lump iirc (worth a search), a long shaft I think..... Personally I'd want to avoid an xl shaft....

With regards the twin Optis.... And, again, just my opinion.... I think they'd be too heavy on the A21.... Guessing they're 135 2.5 block engines? My experience of the A21 us that it can be a little bow light heading into sea / wind.... I'd want to avoid too much weight in the arse end.... Pendulum effect a concern! A pair of lighter 2 strokes ideal, but if more modern engines required.... The lighter opti block (up to 115) would be better suited (all in my opinion).... Although on paper the arc22 and atl21 are similar.... The atl21 is in reality a smaller / lighter bit of kit.....
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Old 01 April 2015, 18:24   #4
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Country: Iceland
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thanks for the replies.

The thing is i'm getting a good deal on this engine. Not alot of these available where i live. Since my experience is not alot in the ribbing industry im going to tread carefully. On the other hand i have alot of experience in metal fabricating.

If i were to build up the transom, i was thinking of fabricating a u shaped bracket that bolts through the transom and the floor on the boat, this would be strong enough i would think.

Or is there another way? Pictures maybe?

I have seen these jack plates also, some like them others donīt.

Any info apreciated.
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Old 03 April 2015, 04:28   #5
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Country: UK - England
Town: Rye
Boat name: ribtec 655
Make: ribtec
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Engine: outboard 130 hp
Join Date: Dec 2014
Posts: 9
Hey mat who has the optis for sale? I could be interested in them.
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