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Old 19 August 2019, 14:18   #1
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Rib under 5m that will do 40+Knots?

I have an older avon 4m with a 40 hp Yamaha engine, will see around 36 mph two up.
I have recently decided to get something a bit more modern but found it to be a bit of a minefield out there.
I quite liked the zodiac projet 350 as it seemed like fun but how practical would it be with 3 lads fishing ? Doesn't seem to have anything to attach a spare engine to.
I also enquired about an AVON 400 DL SEASPORT JET RIB which seemed to tick most of my boxes. Problem is it was only pulling 30 mph when advertised as a 40+ Knots boat....
My wee runaround only has a pulling weight of 600kg, for obvious reasons i'd prefer that weight to be nearer 400kg or less.
Main wants are pulling weight related, having a bit of room to fish off but when there are no fish biting I want something to have a good blast about in....
I quite like the avon ribs under the deluxe category but have to be practical as well....
What are peoples thoughts on the above ? If I ditched the jet rib idea and just got a 3.8m-4.5 metre rib would that give me the space I yearn for ?(I think it would if set up correctly). What kind of hp engine should I be looking for to get that boat into my 40 Knots+ territory ? Two stroke vs Four stroke ? I would prefer something between 2k and 5k as I have other hobbies and interests so 'said' boat would be out on the water maybe 5-8 times a year!
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Old 19 August 2019, 14:47   #2
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Most RIBs of that size are going to be unuseable/unsafe at 40 knots. You'd be over-powering it to get it to that speed.

A Zapcat is about the only thing that springs to mind, but that's not a RIB.
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Old 19 August 2019, 14:59   #3
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Slightly longer than 4.5m, but my 4.7 searider with a 70hp Tohatsu (max rating) did 34 knots, I had a 4.8m ribcraft that did about 32 knots with a 70hp evinrude.

Seen both boats with a 90hp on, but mine would chinewalk with a 70hp, so doubt it was particulary great.
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Old 19 August 2019, 15:58   #4
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I have a 4.5 m with a 60 hp on and it will get to about 36 Knots. I would not want to go any faster as it gets scary
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Old 19 August 2019, 19:18   #5
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TBH, unless you're going to change the tow car just forget anything bigger than your current Avon, or go bigger for a better ride and a consistently higher speed rather than short bursts of spinebreaking then hour of regret. I've done 40 knots on a 4m Searider. It's scary and if a mackerel had farted nearby I'd have had serious problems.

Anything sub 5.8m that's not a Zapcat is going to be bloody dangerous at over 40 knots. You'll have about 6 inches of the hull in the water and if anything goes wrong you'll be right in the smelly stuff.

Besides, once you start putting more than just yourself onboard it's going to take a lot more power to get that kind of speed.
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Old 20 August 2019, 09:29   #6
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Hmmm under 5m 50 knts, stable, fishing, tall order......oh and weighs 389kg dry so should be towable with wee runaround......


https://youtu.be/Gi7lS2yPSFU

Or any other PWC with some mods.......
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Old 20 August 2019, 10:15   #7
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Just for perspective, I had a Ribcraft 585 with a 175 Evinrude Ficht RAM (2 stroke DI) I could get that to 47kn & it wasn’t for the faint hearted. I doubt very much if you’re going to find a craft that ticks all your boxes:-
Price/weight/speed/capacity/size. You could actually take the price out of the equation. As you’re going to struggle on weight/speed/capacity/size.
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Old 20 August 2019, 11:01   #8
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I'd have thought the OP would have got the message by now
Faster in Safety = Bigger! Bigger=Larger =increased Budget= increased running costs...and possibly = Bigger Tow vehicle.
By all means up-grade when the time is right for you...but you'll never cram a Quart into a Pint Pot
In the meantime the destinations and company you travel with/share experiences with are the most important thing.
The Gurnard's adventures show this to us all time and again
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Old 20 August 2019, 11:21   #9
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Ribcraft 4.8m
Yamaha 90HP
51mph no problem at all
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Old 20 August 2019, 12:37   #10
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Quote:
Originally Posted by 69cmw View Post
Attachment 130548
Ribcraft 4.8m
Yamaha 90HP
51mph no problem at all
Dunno if an RC 4.8 is do-able for less than 5k. And you'd need to find a Yam 90 two stroke. And then there'd be the caveats about exceeding the plated max hp for insurance purposes. But yeah, based on the test sheets off the RC website I can see a 4.8 with a Yam 2 stroke breaking 40 knots.
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