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AACB Class 2

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Status: Study 1966. Payload: 9,072 kg (20,000 lb). Gross mass: 745,479 kg (1,643,499 lb).

Two alternates were considered:

• Alternate I was a vertical-takeoff vehicle, with both stages equipped with turbojet engines to assist in landing back at airfields. The orbiter retained the lifting-body shape of the Class I vehicle but was much larger since it had to carry internal tanks for the Lox/LH2 rocket propellants. Total mass vehicle mass at lift-off was 745,500 kg; development cost $ 3 billion; cost to operate per flight, $ 4 million
• Alternate II was a horizontal takeoff vehicle. Cost would be $ 4 billion to develop. The gross mass would be 600,000 kg, with the first stage weighing 465,000 kg and the second stage 125,000 kg.

LEO Payload: 9,072 kg (20,000 lb). Development Cost $: 3,000.000 million. Launch Price $: 4.000 million in 1966 dollars in 1966 dollars.