The Tee Dee was tested by Aeromodeller Magazine in 1962 and the output power was recorded to be.105 bhp (78 watts) @ 22,000 rpm with a max torque of 5.5 oz.in. at 18,000 rpm on 25% Nitro. (Note: The modern Norvel AME 049 engine which has an aluminum piston running in a ceramic coated cylinder, outputs.14 bhp (100 watts)@ 20,000 rpm). In 1973 the bypass porting, crank shaft timing and venturi were modified slightly and a mesh screen was added to the venturi to keep out dirt. This resulted in a minor performance improvement over the earlier versions.