Does sib length make much difference to speed?

[Barter]

Say a 3.2 vs a 3.8 with a 15, 9kg weight difference. would there be noticeable difference in speed? Both with 2 up. Final newbie question I promise

[jeffstevens763@g]

not much in speed terms IMO but in size well worth the 3.8, ride wise length is better but it's all down to sea conditions as is speed

[Max...]

This will all cross over with your main topic so better to keep it all together in one.

A lot of variables though - hard floor, air floor, deep V, medium V, flat floor? All affect speed a lot as do trim and weight distribution. But like for like it won't differ that much.

Much more important than 1/2 to 1 knot here or there at WOT is choosing the right length/floor type boat for the conditions/use/crew/transport.

In typical UK coastal conditions in the summer in a SIB in F3/F4 then you won't be at WOT lots of the time anyway.

[Mikefule]

On perfectly flat water, the difference at planing speed in a straight line may not be all that much.

However, in a chop, or a big swell, the extra stability, dryness, and confidence of having a bigger hull will probably translate into higher average speed over a journey.

[chipko]

All good advice above.

9 kilo difference and 3.2 to 3.8...assume talking Honwave’s...so both same hull.

With same hp motor and only 9 kilo weight disadvantage then the 3.8 will get on the plane quicker than 3.2.

The extra length of the 3.8 will translate into much faster/ comfortable average speeds in typical uk chop/swell regardless of motor. Go 3.8.