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thats Boeing HLLV from 1976-79QuoteBoeing also investigated large two-stage vertical takeoff, horizontal landing (VTHL TSTO) heavy-lift reusable launch vehicles for 380-420t payloads. The company's "reference vehicle" from 1976 was used as a baseline for NASA's early SPS technology assessments. Its gross liftoff mass was 11,000t and the payload capability was 420t. The specific transportation cost was $44/kg [1978 economic conditions].source: from Marcus Lindroos homepage
thats Boeing HLLV from 1976-79
Quote
Boeing also investigated large two-stage vertical takeoff, horizontal landing (VTHL TSTO) heavy-lift reusable launch vehicles for 380-420t payloads. The company's "reference vehicle" from 1976 was used as a baseline for NASA's early SPS technology assessments. Its gross liftoff mass was 11,000t and the payload capability was 420t. The specific transportation cost was $44/kg [1978 economic conditions].
source: from Marcus Lindroos homepage
