MTT 420RR. The only production motorcycle on the planet powered by a helicopter engine. Built by Marine Turbine Technologies in Louisiana, the 420RR is powered by a Rolls-Royce M250-C20B gas turbine - the same engine found in the Bell 206 JetRanger helicopter, producing 420 horsepower and 500 ft-lbs of torque. Top speed is a gearing-limited 273mph — limited not by power but by the fact that no tyre currently exists that can safely handle more. It runs on diesel, kerosene, or Jet-A fuel, features a two-speed automatic transmission, Öhlins suspension, ISR brakes, and BST carbon fibre wheels — and is hand built to order at a rate of five units per year, priced at $275,000 each. Jay Leno, who owns one, described riding it as "the hand of God pushing you in the back." The Kawasaki H2R produces 300 horsepower and is considered extreme. The MTT 420RR produces 420 from a turbine that was designed to keep helicopters airborne. These are not the same category of machine. Is the MTT 420RR the...