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Atlas V.

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It is powered by a single Russian RD-180 main engine burning 627,105 lb (284,450 kg) of liquid oxygen and RP-1

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The Atlas V is the newest member of the Atlas family. Compared to the Atlas III vehicle, there are numerous changes. Compared to the Atlas II, the first stage is a near-redesign. There was no Atlas IV.
The main features of the Atlas V with regards to the Atlas family are:

  1. The first stage tanks no longer use stainless-steel monocoque "balloon" construction. The tanks are isogridaluminum and are structurally stable when unpressurized.[7]
  2. Use of aluminium, with a higher thermal conductivity than stainless steel, requires insulation for the liquid oxygen. The tanks are covered in a polyurethane-based layer.[citation needed]
  3. Accommodation points for parallel stages, both smaller solids and identical liquids, are built into first-stage structures.[7]
  4. The "1.5 staging" technique is no longer used, having been discontinued on the Atlas III with the introduction of the Russian RD-180 engine.[7] The RD-180 features a dual combustion chamber, dual-nozzle design and is fueled by a kerosene/liquid oxygen mixture.
  5. The main-stage diameter increased from 10 feet to 12.5 feet. As with the Atlas III, the different mixture ratio of the engine called for a larger oxygen tank (relative to the fuel tank) compared to Western engines and stages.[citation needed]

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