WAS A BLACKBIRD ASPEN SPACE SHUTTLE BUILT?

"The Lockheed SST proposal basically was a three times scale of the SR-71, already proven in flight." 
-Kelly Johnson

Specifications (L-2000-7A)[edit] Data from[citation needed] General characteristics ·         Capacity: 273 passengers ·         Length: 273 ft 2 in (83.26 m) ·         Wingspan: 116 ft (35.36 m) ·         Height: () ·         Wing area: 9,424 ft² (875 m²) ·         Empty weight: 238,000 lb (107,900 kg) ·         Max. takeoff weight: 590,000 lb (267,600 kg) ·         Powerplant: 4 × GE4/J5M or Pratt & Whitney JTF17A-21L Performance ·         Cruise speed: Mach 3.0 ·         Range: 4,000 nmi (7,400 km) ·         Service ceiling: 76,500 ft (23,317 m) ·         Wing loading: 62.61 lbs/ft2 ()

Specifications (SR-71A)[edit] Data from Pace[121] General characteristics ·         Crew: 2: Pilot and Reconnaissance Systems Officer (RSO) ·         Payload: 3,500 lb (1,600 kg) of sensors ·         Length: 107 ft 5 in (32.74 m) ·         Wingspan: 55 ft 7 in (16.94 m) ·         Height: 18 ft 6 in (5.64 m) ·         Wing area: 1,800 ft2 (170 m2) ·         Empty weight: 67,500 lb (30,600 kg) ·         Loaded weight: 152,000 lb (69,000 kg) ·         Max. takeoff weight: 172,000 lb (78,000 kg) ·         Powerplant: 2 × Pratt & Whitney J58-1 continuous-bleed afterburning turbojets, 34,000 lbf (151 kN) each ·         Wheel track: 16 ft 8 in (5.08 m) ·         Wheelbase: 37 ft 10 in (11.53 m) ·         Aspect ratio: 1.7 Performance ·         Maximum speed: Mach 3.3[121][122][N 5] (2,200+ mph, 3,540+ km/h, 1,910+ knots) at 80,000 ft (24,000 m) ·         Range: 2,900 nmi (5,400 km) ·         Ferry range: 3,200 nmi (5,925 km) ·         Service ceiling: 85,000 ft (25,900 m) ·         Rate of climb: 11820 ft/m (60 m/s) ·         Wing loading: 84 lb/ft² (410 kg/m²) ·         Thrust/weight: 0.44

The NEPA/ANP program was working on some incredibly large engines. A 40 foot long J-58 engine is not out of the realm of possibility.