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Boeing B-377-SG/SGT Super Guppy

Aero Spacelines Super Guppy

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The Aero Spacelines Super Guppy is a large, wide-bodied cargo aircraft that is used for hauling outsize cargo components

Aero Spacelines Super Guppy

The Aero Spacelines Super Guppy is a large, wide-bodied cargo aircraft that is used for hauling outsize cargo components. It was the successor to the Pregnant Guppy, the first of the Guppy aircraft produced by Aero Spacelines. Five were built in two variants, both of which were colloquially referred to as the “Super Guppy”.

The Super Guppy is “the only airplane in the world capable of carrying a complete S-IVB stage”, the third stage of the Saturn V rocket.[3] The Super Guppy performed this role several times during the Apollo program.


The first, the Super Guppy, or “SG”, was built directly from the fuselage of a C-97J Turbo Stratocruiser, the military version of the 1950s Boeing 377 Stratocruiser passenger plane. The fuselage was lengthened to 141 feet (43 m), and ballooned out to a maximum inside diameter of 25 ft (7.6 m), the length of the cargo compartment being 94 ft 6 in (28.8 m). The floor of the cargo compartment was still only 8 ft 9 in (2.7 m) wide, as necessitated by the use of the Stratocruiser fuselage

RoleOutsize cargo aircraft
ManufacturerAero Spacelines / Airbus
First flightAugust 31, 1965[1]
StatusActive, operated by NASA
Primary usersAero Spacelines[1]
NASA, Airbus, Aeromaritime[1]
Number built1 SG, 4 SGT[1]
Developed fromC-97J Turbo Stratocruiser[1]
377 Stratocruiser[2]
Pregnant Guppy (fourth SGT built with cannibalized pieces from PG)



  • Aero Spacelines B-377-SG Super Guppy, prototype of a much enlarged version of the Guppy using C-97J components, powered by four Pratt & Whitney T-34-P-7WA turbo-prop engines.[1]
  • Aero Spacelines B-377-SGT Super Guppy Turbine (Guppy 201), production version powered by Allison 501-D22C turbo-prop engines,[1] using an enlarged cargo section built from scratch instead of being converted from original C-97J components.

General characteristics

  • Crew: 4
  • Length: 143 ft 10 in (43.84 m)
  • Wingspan: 156 ft 3 in (47.63 m)
  • Height: 48 ft 6 in (14.78 m)
  • Cargo bay dimensions: 111 ft × 25 ft × 25 ft (33.83 m × 7.62 m × 7.62 m)
  • Wing area: 1,965 sq ft (182.6 m2)
  • Airfoil: root:Boeing 117 (22%); tip: Boeing 117 (9%)[11]
  • Empty weight: 101,500 lb (46,040 kg)
  • Max takeoff weight: 170,000 lb (77,111 kg)
  • Powerplant: 4 × Allison 501-D22C turboprop engines, 4,680 shp (3,490 kW) each
  • Propellers: 4-bladed constant-speed fully-feathering propellers

Specifications (377-SGT) Guppy



  • Maximum speed: 250 kn (290 mph, 460 km/h)
  • Cruise speed: 220 kn (250 mph, 410 km/h) economical cruise at 20,000 ft (6,096 m)
  • Range: 1,734 nmi (1,995 mi, 3,211 km)
  • Service ceiling: 25,000 ft (7,600 m) certified
  • Wing loading: 86.5 lb/sq ft (422 kg/m2)
  • Power/mass: 0.11 hp/lb (0.18 kW/kg)


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Antonov State Company is a Soviet, and later is a Ukrainian aircraft manufacturing and services company. Antonov's particular expertise is in the fields of very large aeroplanes and aeroplanes using unprepared runways.