On Dinosaurs + Robots, Mister Jalopy wrote about this sweet 1940s gas-powered model racer:

Starting in the 1920’s, well before radio control cars, hobbyists built and raced nitro burning model cars tethered to a center point like an old Cox airplane. Eventually, there was a commercial market of such size that small manufacturers like Duro-Matic in Los Angeles started producing small numbers for sale. Tether racing is still going strong with world records in the 200+ mph range.

Duro-Matic Streamliner Gas Engine Tether Car