My Attempt to Build a Sport C Class Racing Powerboat

Sport C is a tunnel boat class using boats about twelve feet long which achieve speeds approaching 60 mph with stock motors up to 35 cubic inches. At these speeds, a tunnel boat can literally fly.

Motors approved for this class are made by Nissan/Tohatsu, Suzuki, Yamaha and US Marine. The Nissans and Tohatsus, however, dominate the class.

Hydraulic trim is used in Sport C, and a reinforced cockpit or capsule is required. The minumum weight for boat, motor and driver is 675 lbs. Speeds top out at 58-59 mph.

The Dillon Sport C is 12'8" long by 76" wide. The reinforced cockpit is foam-core construction using fiberglass, carbon fiber and Kevlar fabric set in epoxy. The remainder of the boat is marine plywood.

Unfortunately, the Sport C turned out to be 30 - 35 lbs. overweight. I was only able to attain 50 mph with borrowed props availble to me. Perhaps investment in a custom-tweaked propeller would have made this boat competitive, but I was not willing to sink the money into a possibly losing venture. Therefore, I made the decision to convert the Sport C to GT Pro.

You can see the construction of the original Sport C boat on the following pages.

Page One, Page Two, Page Three, Page Four, Page Five

You can see how I converted the boat to GT Pro HERE.

Dillon Pro Tunnel Payment Options More Info/Video

Dillon Mini Tunnel Payment Options More Info/Video

Dillon Pro Vee Payment Options More Info/Video

Dillon Mini Vee Payment Options More Info/Video