Gulfstream G450

The Gulfstream 450 (or G-IV or GIV) and derivatives are a family of twin-jet aircraft, mainly for private or business use. The aircraft was designed and built by Gulfstream Aerospace, a General Dynamics company based in Savannah, Georgia, United States from 1985 until 2003.

Gulfstream, in collaboration with Grumman began work on the Gulfstream IV in March 1983 as a re-engined,stretched fuselage derivative of the Gulfstream III. A decision to redesign the wing structure for weight reduction presented an opportunity for an aerodynamic redesign of the wing to reduce cruise drag and increase range. Wing contour modifications had to be restricted to the forward 65% of wing chord so that no redesign of the control surfaces would be necessary. Modification of the inboard wing would have entailed a redesign of the fuselage floor structure, consequently this region of the wing was not modified. Outboard wing modifications were aimed at reducing the peak subcritical pressure coefficient and moving it aft in an effort to reduce shock strength and increase shock sweep. The Gulfstream IV wing has a weaker, more swept outboard shock resulting in a lower cruise drag. Other benefits arising from this design are a lower root bending moment due to the more inboard center of pressure, a lower stall speed due to washout and a larger fuel volume due to increased chord. These aerodynamic improvements result in an increase in range of over 300 nautical miles.[4]

The first GIV made its maiden flight on September 19, 1985. The model received type certification from the FAA in April 1987. The G-IV entered into service with serial number 1000 in 1987 and was upgraded to the special purposeGIV-SP version at serial number 1214 in 1993. It was later redesignated G400 at serial number 1500.

A shorter range variant was created based on the GIV and given the G300 designation in 2002.[5] The G400 has a large cabin, long range of 4,350 nautical miles (8,060 km) and the same comfort and design that characterize the G series. Typical cruise height and speed are 45,000 ft and Mach 0.88. Earlier models were fitted with Honeywell’s SPZ 8000 Avionics package. The SPZ 8400 Avionics Package was an option, becoming standard on later models. It costs about $15 million at 2009 prices.[6]

In 2001 Gulfstream began work on an improved version of the GIV-SP, originally designated GIV-X. It was later renamed G450. The G450 is lengthened 1 ft (0.305 m) over the G400 and shares the forward fuselage and larger cockpit of the G550. Production of the G450 began in October 2004, replacing the G400. The G450 has better performance and comes with the PlaneView cockpit with four 14 in (355 mm) liquid crystal displays and a Head up display (HUD). The shorter range G350 version of the G450 was developed and received certification in 2004.[7][8]



GIV GIV-SP G350 G450
Cockpit crew Two
Seating capacity 14-19 19 maximum
12-16 typical
Length 88 ft 4 in (26.9 m) 89 ft 4 in (27.2 m)
Wingspan 77 ft 10 in (23.7 m)
Overall height 24 ft 5 in (7.44 m) 25 ft 2 in (7.67 m)
Maximum take-off weight
73,200 lb (33,200 kg) 74,600 lb (33,800 kg) 70,900 lb (32,200 kg) 73,900 lb (33,500 kg)
Empty weight 35,500 lb (16,100 kg) 42,700 lb (19,400 kg) 43,000 lb (19,500 kg)
Cruising speed Mach 0.80 (460 knots, 528 mph, 850 km/h at altitude)
Maximum speed Mach 0.88 (505 knots, 581 mph, 935 km/h at altitude)
Initial Rate of Climb N/A N/A N/A N/A
Range 4,220 nmi (7,820 km; 4,860 mi) 4,220 nmi (7,820 km; 4,860 mi) 3,800 nmi (7,040 km; 4,370 mi) 4,350 nmi (8,060 km; 5,010 mi)
Range w/ 4 pax N/A N/A N/A N/A
Range w/ max fuel N/A N/A N/A N/A
Service ceiling 45,000 ft (13,700 m)
Engines (×2) Rolls-Royce Tay 611-8 Rolls-Royce Tay 611-8C
Thrust (×2) 13,850 lbf (61.6 kN)

Sources: Frawley, Gulfstream G450 page, Gulfstream G350 page

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