This boat is based on the Boojun Rigger plan in the English publication "Marine Modeller". The original design was for a stock 540 motor, straight shaft, and 6 cells. The length is 20" and beam is 13" Construction is of 0.8mm and 1mm ply & foam. I went for 0.8mm ply over foam for the sponsons because being only an average skill builder, I find it easier to get the sharp edges and the flat riding planes required, with ply. I narrowed the riding planes somewhat, for less resistance and more speed. Sponson booms are 5.5mm carbon fibre arrow shafts. Next, I changed the straight shaft for an "Octura" flex shaft and strut And to keep the weight down, I painted the boat with 3 coats of white "one pak" epoxy.

The 12 turn motor in the pics, didn't last long and I have since installed an "Astroflight" 05 5 turn cobalt motor, and a micro switch speed control to replace the E.S.C. PS- my E.S.C. was way too light ot handle the 5 turn cobalt. I noticed in articles, most racers use a small prop. 432 etc, a 3 or 4 turn motor. The 5 turn motor was the only one available in the country at the time I purchased it. So with more torque but less RPM available I needed a large prop. After trying several props, I settled on the Octura 438 - 3 blade off my 3.5 outboard tunnel.

The performance of this little rigger is stunning, with speeds of over 35 mph (60 kmh). I cant give an exact speed. Haven't measured it, but it will stay with my 3.5cc K&B stock tunnel. With 2000 MAH Sanyo cells, I get a 3 minute engine run. On seven cells, it's ballistic, but run time is down to about 1 3/4 minutes, and heat is a real problem.