I've got a model cat that's 3 feet long and uses US One Meter sails. It has WAY too much power and the sails have a hooking problem that keeps the boat from pointing well. I struggle with it because it is so light and the sailplan so tall that it pitchpolls in a heartbeat. I've considered adding a servo with a long arm in the center of the "trampoline" with a counterweight at the end of the arm. It could be rotated to the aft corner, rear beam, or either hull to help give a little more righting moment. As it is, it accelerates like a bullet but it is hard to control.

When I get some more time to mess with it, I will probably reduce the sail area, make new sails, and try the counterweight thing controlled by a knob on my radio.