An early Cox design, the “Space Bug” (control line) or “Thermal Hopper” (free flight) versions were good performers. This reed valve engine features a rear carburetor fed from a remote fuel tank rather than one attached to the engine. It is displayed with a cut-down 4-bladed propeller. This engine is in original condition. The dust has been cleaned off, but it hasn’t been polished, and the compression is good.