During pre-war Germany in the 1930s, rocket-propelled vehicles inspired countless new inventions. These rocket-propelled vehicles included cars, airplanes, boats, motorcycles, and skates, both roller and ice. However, one of the most peculiar uses of rocket propulsion was on a bicycle. In 1931, German engineer Herr Richter created the Raketenrad, or rocket-bike, by attaching twelve black powder solid-fuel rockets to the rear of his bicycle. Richter then attempted to ride his creation down the Avus race track in Berlin, reportedly achieving a top speed of 55 miles per hour. Then he lost control and was thrown from the bike. Fortunately, Richter was not seriously hurt.