TMM40 is small expendable turbojet engine rated for 40daN of static thrust. It has been design to meet low-cost engine approach, but to keep thrust-to-weight and thrust-to-cross section ratio at the challenged level. Also, design goal was that engine can be easily sized to bigger engines, up to 500daN. Engine consist of three stage axial compressor, annular combustion chamber with six injectors, axial turbine. Intake and exhaust nozzle modules may be modificated for certain missile design.