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Old 04 June 2007, 17:28   #1
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Country: Sweden
Town: Stockholm
Make: KR7
Length: 7m +
Engine: Evinrude 150 H.O
Join Date: Aug 2005
Posts: 735
Stepped hull or not (again)

If you have a revenger 27 or 29. With same engine, lets say a e-tec 250.

What is the topspeed at flat water with and without stepped hull?

Is it difference even at flat water?
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Old 05 June 2007, 09:21   #2
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Country: UK - England
Town: Aylesbury/Lymington
Boat name: Farfetched
Make: Solent
Length: 6m +
Engine: 150hp Optimax
MMSI: 235021048
Join Date: Apr 2004
Posts: 859
I have played with the Hydrosport stepped 6.5M vs the unstepped but similar Solent 6.5M. My gut feel is that the stepping is more about a slightly softer ride (air cushioning) and quicker coming unstuck than raw speed - at least at the 40k level. Dag Pike says stepping only helps at 50k+.

FYI the Solent with 150 opti tops out at 44k (both ways, GPS average) in the dead calm but gets 49K (both ways, GPS average) when she is skimming the Solent chop. Both with 20l of fuel and 2 up.
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