Stage 1 Atlas V Rocket
Centerpiece of the first stage is the common core booster, 106.5 feet (32.46 meters) in length and 12.5 feet (3.81 meters) in diameter. It has a throttleable, RD-180 engine from a joint venture of Pratt & Whitney Rocketdyne, West Palm Beach, Fla., and NPO Energomash, Moscow. Thermally stable kerosene fuel (type RP-1) and liquid oxygen will be loaded shortly before launch into cylindrical fuel tanks that make up about half of the total height of the vehicle. The common core booster can provide thrust of up to about 850,000 pounds (3.8 million newtons) at full throttle.