YF-12 BlackbirdThe YF-12A (60-6935) carries the "coldwall" heat transfer pod on a pylon beneath the forward fuselage.The YF-12C was the second production SR-71A (61-7951), modified with YF-12A inlets and engines, and given a bogus tail number...The YF-12C was the second production SR-71A (61-7951), modified with YF-12A inlets and engines, and given a bogus tail number...YF-12A, tail number 06936 on the Edwards ramp.Fueled by JP-7, the Blackbirds were capable of cruising at Mach 3.2 and attaining altitudes in excess of 80,000 feet.The Lockheed A-12's were constructed mostly of titanium to withstand aerodynamic heating.The Lockheed A-12 family, known as the Blackbirds, were designed by Clarence "Kelly" Johnson.The Lockheed A-12 family, known as the Blackbirds, were designed by Clarence "Kelly" Johnson.NASA Test Pilot Don Mallick with YF-12A
