Madsen was responsible for the launch system, launchpad and booster rocket engines. They may also be used to join stages of a booster rocket. This attempt was scrubbed to correct a problem with a booster rocket steering engine. The explosion of the booster rocket left the F10 in an elliptical orbit. The booster rocket successfully performed a powered vertical landing. A booster rocket is located towards the rear end. The UAV is launched with a booster rocket directly out of its container. The uncrewed craft was lifted into orbit by the specially designed Energia booster rocket. The mission used production Mercury spacecraft #14 atop a Little Joe booster rocket. Takeoff was achieved by a booster rocket, which was jettisoned when flight speed was attained. In rocket fuels, polybutadiene acrylonitrile copolymer was used in 1960-70's big solid-fuel booster rocket fuels. Once it reaches the surface, a booster rocket ignites to propel the missile skywards.