Grasshopper was SpaceX’s low-altitude reusable flight testbed for Falcon recovery technology. A Falcon 9 first-stage structure, one Merlin 1D engine and four steel landing legs with hydraulic dampers supported repeated powered takeoff and landing. FAA records document three McGregor flights in 2012; the later NASA-hosted control-testbed review records eight flights overall.
Future launches and major activity directly linked to this vehicle family.