Abstract: A drive shaft for turning wheels of a vehicle or for operating other devices requiring rotary driving motion, has a pair of diametrically opposed compressors non-rotatively mounted upon it and also a dual channeled turbine mounted upon it with a rotor of the turbine keyed to the drive shaft to cause said shaft to turn with said rotor; separate duct means being provided between the two compressors and diametrically opposite points of the turbine's two channels for conducting ignited gas from the compressors to the turbine to drive said rotor and the drive shaft. Each compressor includes a piston, gas intake and exhaust valves, and means for igniting compressed gas in the compressor to charge the ignited gas into the turbine.