By the way, Colin got runner up in the eighties 3C national championship against fast cats and the Marshan 21 was also a serious water ski racing hull. Maybe not as good as Steve Baker's Phantom design in the rough, which was exceptional, but better than a lot of others. The biggest engine that Terry put on the 21 was a prototype Mercury 400, imported from the states.
Didn't work, too much weight and torque, so project abandonded, don't know where the engine ended up. Anyway Marshan 21 with 150- 250 hp is a quick, safe boat with usable cockpit area.