The #Atlas launch vehicle has evolved over the many years. The first Atlas SM-65 was a nuclear missile modified to launch spacecraft. Upper stages were added like Agena and Centaur.
The #skin of the #AtlasRocket was made of stainless #steel and thinner than a US #dime. The tanks could not support their own weight and had to be pressurized with gas to prevent them from crumpling.
This was true from Atlas, to Atlas-Centaur, to Atlas I, Atlas IIAS, and Atlas III.
The #AtlasV’s skin is made of isogrid aluminum; this being a type of machined aluminum that removed triangular sections from the inside of the tank walls, saving weight while preserving strength.
A copper-colored outer cladding is added.
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#EvolvedExpendableLaunchVehicle, #EELV, #AtlasVRocket, #Photography,