Boeing SPS SSTO

American SSTO VTOVL orbital launch vehicle. In 1977 Boeing produced a vehicle design for a 227 metric tons payload vertical takeoff launch vehicle to be used to launch components for the huge Satellite Solar Power platforms that NASA was promoting at the time. The booster would launch from the edge of a water-filled man-made lagoon and recover in the lagoon and used a water-cooled heat shield for reentry.

LEO Payload: 227,000 kg (500,000 lb).