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Old 10 November 2019, 13:40   #1
Country: UK - England
Town: St. Neots
Boat name: SR1,2,3 etc...
Make: AVON/Milpro
Length: no boat
Engine: Honda BF50
Join Date: Aug 2018
Posts: 32
Ribcraft 4.8 70+ hp

Hi All,

Anyone have experience of a Ribcraft 4.8 with 70hp? Itís the stated max capacity but no one seems to have one set up like that. Max speed? Handling?

Also, would Ribcraft uprate a 4.8 to 80hp on request? Would it be manageable?

Thanks, Alex

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Old 10 November 2019, 14:34   #2
Tim M's Avatar
Country: UK - England
Make: Avon Searider SR4
Length: 4m +
Engine: Yamaha 50
Join Date: Jan 2004
Posts: 5,793
The RC 4.8 used to be rated at 60hp so the 70hp thing must be a reasonably recent change. A 4.8 will chine walk lightly loaded with a 60, so I don't think you'd need 80.

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Old 10 November 2019, 15:56   #3
Country: UK - Scotland
Make: Destroyer 5.5/Ring18
Length: 3m +
Engine: Yam 90HP/Yam200HP
Join Date: Jul 2009
Posts: 723
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Mine never chine walked with a 90HP on it, it was well balanced, you just need to set it up good.
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Old 11 November 2019, 08:57   #4
spartacus's Avatar
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,968
I've got 70hp on mine. Actually the engine is a 2-stroke Tohatsu MC60C tweaked to 70hp, weighs in at 118kg. M60 and M70 engines are identical apart from some tweaks to throttle and advance stop.

Top end speed isn't important to me, its overall low end grunt and cruising speed. It will achieve 30mph, two up with trim out slightly and 60 litres of fuel and usual kit on board, tender and 4hp auxilliary engine. Currently has 17 pitch stainless steel propeller. There is a whole argument out there about the benefits of stainless steel propellers on sub 100hp engines. I think it makes a marginal difference only.

A 15 pitch propeller wi give you better hole shot for sure.

If I ever change it, then a Yamaha 70hp 4-stroke would be top of my list.

The transom weight rating is key.
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Old 13 November 2019, 08:51   #5
Country: UK - England
Town: Leicestershire
Make: Avon SR4 Zodiac 310
Length: 4m +
Engine: Merc 40 2s Merc 15 2
Join Date: May 2009
Posts: 191
I've recently bought a Ribcraft 4.8 with a 70hp Tohatsu 2 stroke but I've havnt had the chance to use it yet
Previous owner was
very experienced said it was well balanced no problems , I'd just be concerned of the weight of some engines
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rib, ribcraft

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