G-1159 Gulfstream III

The Gulfstream II (G-II) is an American twin engine business jet designed and built by Grumman and then in succession, Grumman American and finally Gulfstream American. Its Grumman model number is G-1159 and its US military designation is C-11 Gulfstream II. It has been succeeded by the Gulfstream III. The first Gulfstream II flew on October 2, 1966.

Grumman: G-1159 Gulfstream III

Role Business jet
Manufacturer Gulfstream Aerospace
First flight 2 December 1979
Introduction 1980
Primary users United States
Gabon / India / Italy
Produced 1979–1986
Number built 202
Developed from Grumman Gulfstream II
Developed into Gulfstream IV/G400/G450


G-1159 Gulfstream II

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Gulfstream III

The Gulfstream III, a business jet produced by Gulfstream Aerospace, is an improved variant of the Grumman Gulfstream II.
The Gulfstream III was built at Savannah, Georgia, in the United States and was designed as an improved variant of the Grumman Gulfstream II. Design studies were performed by Grumman Aerospace Corporation in collaboration with Gulfstream American Corporation. Design of the Gulfstream III started with an effort to synthesize a completely new wing employing NASA supercritical airfoil sections and winglets. Optimization studies considering weight, drag, fuel volume, cost, and performance indicated that a substantial portion of the new wing benefit could be secured with modifications to the existing wing


As a result, the new wing concept was canceled and work began on design modifications that would retain the Gulfstream II wing box structure and trailing edge surfaces.[2]

Compared to the G-1159 Gulfstream II, the wing has 6 ft (1.8 m) more span and 5 ft (1.5 m) winglets added, the leading edge is longer and its contour is modified. The fuselage is 2 ft (0.6 m) longer aft of the main door, the radome is extended and there is a new curved windshield. Maximum takeoff weight is increased to 68,200 lb (30,935 kg) or 69,700 lb (31,615 kg) and there are various changes to the autopilot, flight instruments, and engine instruments.

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Grumman G-1159 Gulfstream III (1979)

A NASA Gulfstream C-20B (83-0502 cn 389) has been fitted with a centerline pylon to allow it to carry the Unmanned Aerial Vehicle Synthetic Aperture Radar (UAVSAR) pod.

A NASA Gulfstream III (N992NA cn 309) has also been fitted with a centerline pylon to allow it to carry the Airborne Microwave Observatory of Subcanopy and Subsurface (AirMOSS) pod, a modification of the UAVSAR pod.

The Phoenix Air Group operates two former Royal Danish Air Force SMA-3 aircraft (N173PA cn 313, N163PA cn 249) and a Gulfstream III (N186PA cn 317). One aircraft provides airborne maritime range surveillance for the Missile Defense Agency (MDA) and other Department of Defense range facilities using a high definition Texas Instruments APS-127 Surface Search Radar system.


Crew: 2-3

Capacity: 19 passengers (standard seating)

Length: 83 ft 1 in (25.32 m)

Wingspan: 77 ft 10 in (23.72 m)

Height: 24 ft 4.5 in (7.430 m)

Empty weight: 38,000 lb (17,237 kg)

Max takeoff weight: 69,700 lb (31,615 kg)

Powerplant: 2 × Rolls-Royce Spey RB.163 Mk 511-8 turbofan engines, 11,400 lbf (51 kN) thrust each

Maximum speed: 501 kn (577 mph, 928 km/h) (max cruise)

Cruise speed: 442 kn (509 mph, 819 km/h) (long range cruise)

Stall speed: 105 kn (121 mph, 194 km/h)

Range: 3,650 nmi (4,200 mi, 6,760 km) (eight passengers, IFR reserves)

Service ceiling: 45,000 ft (14,000 m)

Rate of climb: 3,800 ft/min (19 m/s)

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Seven U.S. Navy squadrons flew the F11F-1: VF-21 and VF-33 in the Atlantic Fleet and VA-156 (redesignated VF-111 in January 1959), VF-24 (redesignated VF-211 in March 1959), VF-51, VF-121, and VF-191 in the Pacific Fleet.

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