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Old 05 July 2015, 10:26   #1
Country: Germany
Town: Düsseldorf
Boat name: Ribbi
Make: Ribcraft
Length: 4m +
Engine: Suzuki Dt 55
Join Date: Apr 2011
Posts: 29
Hull has to be cleaned?

Hello everybody,
I just read that somebody recommends a nearly polished hull for best top speed results.

My hull has some Gelcoat stripes to repair scratches from the formaly owner.

I never took care of that, but was wondering why some 4.8 RC (with the same load)equipped with Yam 60 hp 4 Stroke are going 2-4 kn faster than mine with 65 hp 2 Stroke ( Suz Dt55 with 65 carbs on). Top Speed is 28kn with 65 l Petrol and full fishing Equipment.

What do you guys think, does it make sense making a full new hull cleaning to increase top Speed ? Is it worth the work?



ragbar is offline   Reply With Quote
Old 05 July 2015, 11:31   #2
Country: UK - England
Town: Bristol
Make: Ribcraft
Length: 5m +
Engine: Yamaha
Join Date: May 2006
Posts: 4,276
Alot of work for maybe a knot... Also you cannot compare an old DT55 with a Yam 60 four stroke.
As an example of another type of four stroke...I got 35 knots out of my RC 4.8 40 litres fuel.. merc 60 EFI 4 blade spitfire prop 11x17 pitch
Almost empty 37 knots.
Look at your RPM and prop/engine height/Balance hull etc
Member of S.A.B.S. West Country Division
matt h is offline   Reply With Quote

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