Maximizing small boat stability

[Patrick_76]

I am trying to maximize the stability of a small boat that I am designing. It is 12 feet long with a bottom width of approximately 40 inches. The boat does have a slight v for most of the boat (chines are 3 inches above the keel). The beam is 60 inches. Side height right now is 15 inches. The hull lines are somewhat similar to Devlin's Bluebill. I am designing this boat for use in sheltered sloughs, creeks, flooded timber, and small, slow moving rivers (no more than 150 feet across). Any thoughts are how stable such a design will be?

Thanks,
Patrick

[Raggi_Thor]

It sounds reasonable. A deadrise of 3 to 20?

[Patrick_76]

I think I'm going to bring the V up some 10-12 inches at the front. I'll post up a pic when I get home to give you a better idea.

On the deadrise, do you think that is too much or not enough for a small boat? The thing will probably be powered by a 5 or 9.9 hp motor.

[tom28571]

The bottom sounds ok but the flare on the sides seems excessive at almost 34 degrees. 40" chine beam and 60" sheer beam?

[Raggi_Thor]

Maybe the topsides has more flare than usual, but if you are rowing you want a small waterline beam. The displacement up to the chines may be around 60kg or 130lbs?

[Patrick_76]

That beam is a bit wide isn't it? The original plans had a 48" bottom (1 sheet of plywood wide). I dropped the width at the chines, but didn't drop the width at the beam. I'll check some different sizes tonight to see what comes out looking better.

Thanks,
Patrick

[Raggi_Thor]

If the boat is very light and someone step on the rail....