Nord 1500 Griffon
Prototype of a ramjet-powered fighter aircraft designed and built in the mid-1950s by French state-owned aircraft manufacturer Nord Aviation. It was part of a series of competing programs to fill a French air force specification for a Mach 2 fighter. The Griffon actually featured a dual turbojet-ramjet powerplant, with the turbojet enabling unassisted take-offs (ramjets cannot produce thrust at zero airspeed and thus cannot move an airplane from a standstill) and the ramjet producing extra thrust at airspeeds above 600 km/h (400 mph).