vanes, sails, gyros, fins...what about water tanks?

[HopCar]

You could make the tubes much smaller if you filled them with lead shot instead of water.

Tad as our resident boat designer, have you ever heard of using trim tabs on the back of a boat as anti-roll devices? I know on my small planning boat the tabs can make it lean to one side or the other pretty quick. Trim tabs are less prone to damage than wing type stabilizers and a lot cheaper and easier to install.

 

[RickB]

Trim tabs have been used for roll control but like fins, they work best at higher speeds and at higher speeds the typical recreational hull doesn't roll much anyway.

I have thought about using active "interceptors" as they can provide a fair amount of lift at speed with less drag than fins or tabs.