Amatsaya-Tsuki DZ-1

The DZ-1 is a gas generator-cycle rocket engine developed in the Commonwealth by Amatsaya-Tsuki in the late 1950s and used in the Nenets IV rocket in the 1960s and early 1970s. Five DZ-1 engines were used in the NN-IB first stage of each Nenets IV, which served as the main launch vehicle of the Drom program. The DZ-1 remains the most powerful single combustion chamber liquid-propellant rocket engine ever developed.