mcollinstn

Yeah, if a blowboter can pick up 0.002 mph, then he's KING.

formula31

huge difference between a displacement hull and a planing hull.

DonMan

Here`s what I am wondering:
If sanding the hull reverses the effect of water adhesion, (a concept I understand and believe) then would it give you better results the bigger the hull you have?
I have a 22' Baja hull with 21* deadrise. If I sand the contact area with 1500 grit, will I actually see as much of a gain as say a person with a 29' Outlaw with a 24* hull?
With my hull, how much could I realistically expect to gain by sanding? Give me realistic numbers......

robyw1

Cool thanks guys for the tip. I'm on my way to Home Depot for sand paper. Now should I sand in a bow to stern motion or port to starboard?

Thanks
Roby

Allan4

Hahahahaha.....somedays that is true!!

F31...yes, in some ways, but what i am getting at is with less power friction becomes a greater obstacle or hinderance, generally speaking. We are talking about the same issue, no matter the hull....how to reduce the drag/friction/negative energy of the water rubbing on the hull.

Certainly other variables, but the premise is the same...reduce friction.

I know a guy who syas he picked up 4 mph on a 31AO with big power by wet sanding the hull.

Why don't more people do this we ask??? I don;t know. My guess is appearance.

Donman...this is only a guess, but I would say you might pick up 1mph or so. Having never done this to a power boat, I do not know...an yes....I do race sailboats from time to time...

R....we sand ina circular motion in no particular direction or start/finish area.

I may try this later this year....see what happens.

Allan