These are not my favorites, but lots of people like the nitro engines. Here my friend Klaus implanted a .90 CMB into a Sprintcat. All hardware components arewere made by himself. The rc-adjustable drive system is his own design. This boat is not such a beauty like the others, but it is fast! It is running 65 mph now, measured by GPS. Klaus designed an own head that makes it possible to reduce the amount of nitro in the fuel.