Late 1970's Thunder Tiger Series III Glow Engine - Test Run with Mixed Results!

Test run of a 1977/78 Thunder Tiger Series III, Model 7703 glow engine, made in Taiwan . This is a cross-flow Scavenging design with a cast iron piston and steel liner. The engine was fitted with a 8x6 Master Airscrew prop and ran on 7% nitro with a 20% oil mix (50/50 synthetic and Castor).