If you look at aircraft from the Second World War or earlier, you'll notice that many of them have engines with large frontal areas and cylinders arranged about the propeller crankshaft. This a radial ...

If you recall from the previous thread, I picked up a few old radial engine valve poppet valves. They were covered in cosmoline. I have cleaned one. The valve, as obtained. It's... large. The paper on ...

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 ...

The general layout of the motorcycle hasn’t changed much throughout history. There’s an engine or electric motor bolted to the frame, and via a chain, belt, or driveshaft, it drives the rear wheel.

Tether cars are a whole hobby based on tying a string to a tiny motor vehicle, attaching that string to a pole, and letting the car rip around a circle track at extreme speeds. We’ve covered them in ...