The Gulfstream IV (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.

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.

Specifications

	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 (MTOW)	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)
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)
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)

Source: Wikipedia