Vee hull design-predict maximum speed, hull performance, optimize hull design and setup, test modifications before changing the boat; analyze performance, dynamic. Our famous 2 stroke expansion chamber design software. work on all capacity 2 stroke engines from a motorcycle to a snowmobile,scooter, go-kart, atv, jet-ski, boat. Rc world carries the best radio control products. scale rc truck rock crawlers, and accessories. radio control drift cars , and accessories. shop now.