For this year's Ultimate Issue, I wanted to push myself out of my comfort zone into an airplane worthy of the Ultimate title. I was inspired by Ernest Gantt's seminal work, Fate Is the Hunter, which ...

While Rob Dahm’s garage is no stranger to monstrous rotary engines, including four-rotor units cranking out more than 1,000 horsepower, this one is mind-bending. Here we have a massive, ...

At Big Sky's FAT Ice Race, a bizarre, radial-powered Meyers Manx proved to be the most fun thing on ice.

Continental, a successful manufacturer of automotive engines, purchased the rights for a Burt-McCollum single-sleeve valve engine design in 1925. Believing this technology might replace poppet valves ...

Click to open image viewer. Type: Reciprocating, 18 cylinders, radial, air cooled, two rows, gear-driven 1-stage, 2-speed supercharger Power rating: 1,790 kW (2,400 hp) at 2,800 rpm Displacement: 45.9 ...

Based on a Wright R-975 Whirlwind radial engine, the Hackel-Wright Chopper is unlike any motorcycle you've seen before. It borrows components from Harley and Toyota and is built by a guy named Al ...