Liquid fly-back booster

Liquid Fly-back Booster (LFBB) is a cancelled German Aerospace Center's (DLR's) project to develop a reusable liquid rocket booster for Ariane 5 in order to significantly reduce a high cost of space transportation and increase environmental friendliness. LFBB would replace existing solid rocket boosters, providing main thrust during the liftoff. Once separated, two winged boosters would perform an atmospheric entry, fly back autonomously to the French Guiana, and land horizontally on the airport like an airplane.