The Convair Model 58-9 was a proposed American supersonic transport, developed by the Convair division of General Dynamics and intended to carry fifty-two passengers at over Mach 2. Derived from the B-58 Hustler bomber, it was designed in 1961 but no examples of the type were ever built. The Convair 58-9 would be a Mach 2.4 medium-haul airliner , with a range of 2,525 n.m. (2,900 st.m.) with reserves, powered by four P&W J58s of 33,0001b dry thrust each. At a take-off weight of 190,0001b field length required would be 6,500ft, with a lift-off speed of 199kt (229 mph). Balanced landing field length would be 8,700ft at a touchdown speed at 110,420 lb of 148kt (170 mph). It would carry 52 passengers two-abreast in a conventional fuselage in place of the bomber body and with a horizontal tailplane.