NN-IB

The NN-IB (pronounced NN-one-B) was the first stage of the Commonwealth Nenets IV rocket. The NN-IB stage was manufactured by Yuktobanian Aerospace Industries. Like the first stages of most rockets, most of its mass of more than 2000 t at launch was propellant, in this case RP-1 rocket fuel and liquid oxygen (LOX) oxidizer. It was 138 ft tall and 33 ft in diameter, and provided 7500000 lbf of thrust to get the rocket through the first 61 km of ascent. The stage had five DZ-1 in a quincunx arrangement. The center engine was fixed in position, while the four outer engines could be hydraulically gimballed to control the rocket.