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Old 08 November 2016, 04:32   #11
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OK - thanks very much for all the input.

I've searched the web for something about the Atlantic 75's Hull Rating but have drawn a blank.

Assuming I go for the extra expense of twins - I really need to know if there is some formula to work out whether the boat will take the weight of two four strokes - as per the bigger Atlantic 85.

Put it another way - given the additional weight of fours stroke engines - how much more power would I need to push it all along?

115 / 130 / 150?
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Old 08 November 2016, 04:34   #12
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Initially, I was thinking one big 4 stroke (?150), avoiding the problem with mixing fuel etc.
mixing fuel has never struck me as a particularly challenging task. That said many 2 strokes do it for you anyway.
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I'm told two engines actually only produce about 75% of the combined HP (presumably because they are sharing a relatively small area of water?).
yes, and no. Search for posts on twins by 9d280. A simple rule of thumb like that falls down depending on the engines you are comparing! Some might be better than that, some might be worse.

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I am considering the purchase of a 7.5m RIB from a rescue service. I am a Rib newbie, although I have some basic boating experience learned in my teens (quite some time ago).
However, I am going to suggest that for the majority of RIB newbies, an ex rescue service atlantic is probably not the best boat you can waste your money on! They are designed with one very clear thing in mind, and that is not what most leisure users want/need. If you wanted a camper van would you buy an ex ambulance?
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Old 22 November 2016, 03:44   #13
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Country: UK - England
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Despite the comment about my pride and joy being, basically, an ambulance i've gone and done it. no doubt the comment about this being a money pit will be more than accurate. I have been surfing the 'tinternet for a couple of engines - any suggestions as to dealers - there don't seem to be many about. I found Bill Higham. I'm beginning to think its a little like bic pens. Where DO all the used outboards go?
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Old 22 November 2016, 04:11   #14
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Despite the comment about my pride and joy being, basically, an ambulance i've gone and done it. no doubt the comment about this being a money pit will be more than accurate. I have been surfing the 'tinternet for a couple of engines - any suggestions as to dealers - there don't seem to be many about. I found Bill Higham. I'm beginning to think its a little like bic pens. Where DO all the used outboards go?
Try Solent Outboard Exchange
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Old 22 November 2016, 04:19   #15
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many thanks...
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Old 22 November 2016, 05:16   #16
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Where DO all the used outboards go?
Unlike the Bics, the outboards do NOT slip away to a parallel outboard dimension to do outboard oriented things. They get wrecked by numpty owners, neglected and forgotten - eventually to be broken for parts.

Bics have it handy.
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Old 22 November 2016, 07:41   #17
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If you wanted a camper van would you buy an ex ambulance?
Yep.

Congrats on the boat purchase.

I'd go for the twin set up if I could, primarily for the redundancy it offers in remote areas.
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Old 22 November 2016, 08:20   #18
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What a superb Camper Van.
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Old 22 November 2016, 08:39   #19
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I hasten to say, it's not mine but ambulance motor home conversions can be pretty good.

My non-ambulance conversion is attached.
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Old 22 November 2016, 08:44   #20
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I like the look of that cover - where can I get one for my Boat? While i'm on - how would I decide about the length of shaft that's appropriate? Yamaha seem to do engines for at least 4 different transom heights....
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