Don't they make scale radials in 1/4 scale?
The most common is a 250cc 7 cylinder from a company called Moki. It's a lot more common than this flat 4 setup. A company called Composite ARF makes a 1/4 jug. That's what the model in the pictuer is. When combined with a Moki radial and the 4 blade prop, it's one of the best scale competition planes you can own. Top Gun is Apr 29 to May 3 if you want to see a lot of them up close in your neck of the woods.