The towline had apparently fouled on the aft sphere hatch and wrenched it open. Chain conveyors consist of enclosed tracks, I-Beam, towline, power & free, and hand pushed trolleys. At , Schenk found he had no control, jettisoned his towline, and ejected. A dog or team of dogs is attached with a towline to a bicycle. O'Neal barely had time to duck, but Coppola was struck by the towline and killed. This launch is a variant of the towline launch performed alone. The towline was then "released", and he was left to pedal.