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Payload capability: 100t to a 556km orbit. Cost per kg=$22-33 [1978 economic conditions]. Compatible with C-5A Galaxy cargo and airports (2440-4270m runways) for significant weight & cost savings over top-loading RLVs.
Stage 1 : 3 x LOX/LH2 rocket engines & 10 x turboramjets. Liftoff thrust: 3 * 4,750KN + 10 * 623KN. Isp: 455s. (vac.,rockets). Gross Mass: 2,278.8t including 1826t ascent propellant. Empty Mass: 351.9t. Length: 94.5m. Wingspan: 110m. Propellants: LOX/LH2.
”Overview of the Satellite Power System Transportation System” -- Hanley & Bergeron, AIAA 1978-975