Where a C-class motor from Estes puts out the equivalent of 2 pounds of thrust for one second, an H-class motor--the entry point to high-power rocketry--puts out 55 pounds.
The Electric Defender test vehicles swap the 2.2-liter, four-cylinder diesel engine and six-speed manual gearbox of the regular Defender 110 for a 70-kilowatt electric motor that puts out the equivalent of 94 horsepower and 243 foot-pounds of torque.