Design
Ares I had a payload capability in the 25-metric-ton (28-short-ton; 25-long-ton) class and was comparable to vehicles such as the Delta IV and the Atlas V. The NASA study group that selected what would become the Ares I rated the vehicle as almost twice as safe as an Atlas or Delta IV-derived design. The rocket was to have made use of an aluminum-lithium alloy which is lower in density but similar in strength compared to other aluminum alloys. The alloy is produced by Alcoa.
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