NORTH AMERICAN HTHL TSTO [1963]
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This North American Aviation manned spaceplane concept from 1963 was quite similar to Lockheed's System III design. The launch capability was 11,340kg and the standard payload would have consisted of a small lenticular 12-man orbital transfer vehicle spaceplane (left) for space station logistics and crew transfer. The sled-launched booster rocketplane was 32.9 meters long and would have been powered by a single F-1 + two H-1 kerosene/LOX engines plus turbojets for returning to base. The second stage was mounted on top of the booster. It would have used three liquid oxygen/hydrogen J-2 engines from the Saturn program. This fully reusable system would have had a gross liftoff weight of 548,847kg.
Dennis R. Jenkins, 1981, ISBN: 0963397451