|IAI 1124 Westwind|
|Manufacturer||Aero Commander |
Israel Aircraft Industries
|First flight||27 January 1963|
|Developed from||Aero Commander 500|
The Israel Aircraft Industries (IAI) Westwind (formerly Aero Commander 1121 Jet Commander) is a business jet that became a cornerstone of the Israeli aircraft manufacturing industry and remained in production for 20 years. Usually configured for seven passengers, it can carry as many as 10, or be quickly reconfigured as a fast air freight aircraft.
Design and development
The Westwind was originally designed in the United States by Aero Commander as a development of its twin-propeller namesake aircraft, first flying on January 27, 1963 as the Aero Commander 1121 Jet Commander. It was of broadly conventional business jet arrangement, with two engines mounted in nacelles carried on the rear fuselage. However the wings were mounted halfway up the fuselage instead of the typical low-wing arrangement of aircraft in this class. After successful testing, the aircraft was put into series production with deliveries to customers beginning in early 1965.
After initial testing of the prototype it was modified to production standard with an addition 2ft 6in to the fuselage length and increased payload and maximum weights. The second prototype first flew on 14 April 1964 which was followed by the first production aircraft in November 1964. Type approval was awarded by the FAA in November enabling the first customer delivery on 11 January 1965.
By 2018, 1980s Westwind 1124s were priced from $300,000 to $700,000.
Shortly thereafter, Aero Commander was acquired by North American Rockwell. The Jet Commander created a problem, since Rockwell already had an executive jet of its own design, the Sabreliner, and could not keep both in production because of anti-trust laws. Therefore, the company decided to sell off the rights to the Jet Commander, which were purchased by IAI in 1968.
Jet Commander production amounted to 150 aircraft in the United States and Israel before IAI undertook a series of modifications to create the 1123 Westwind. These included stretching the fuselage and increased maximum takeoff, maximum landing, and maximum zero-fuel weights, with the wing modified to incorporate double-slotted flaps and drooped leading edges and tip tanks. The trimmable horizontal stabiliser was also modified to have increased span and more travel. Not long after the aircraft went into production, the original General Electric CJ610 turbojet engines were replaced by more fuel-efficient Garrett TFE731 turbofans There were also numerous airframe modifications, such as drooped leading edges on the wings, a dorsal fin, revised engine pylons and nacelles, and further increases in maximum takeoff, maximum landing, and maximum zero-fuel weights. With improvements to a number of onboard systems incorporated as well, these changes resulted in the 1124 Westwind delivered from 1976.
In 1976, in the wake of the terrorist takeover of the Savoy hotel in Tel Aviv, the Israeli Air Force decided to use the Westwind as the basis for a maritime patrol aircraft, which became known as the IAI Sea Scan. It had originally been developed to meet a requirement for the United States Coast Guard to replace the Grumman HU-16 Albatross. The Dassault Falcon was selected instead.
In 1980, deliveries of the Model 1124A commenced; modifications included a new wing centre-section and the addition of winglets to the tips. The revamped aircraft was called the Westwind II, replacing the original design in production. IAI built its last Westwind in 1987, after a total of 442 Jet Commanders and Westwinds had been built, switching production to the Astra.
- 1121 Jet Commander
- Original production version, powered by two General Electric CJ610-1 engines developing 2,850 lbf (12,700 N) each; or modified with two CJ610-5 engines developing 2,950 lbf (13,100 N) each. A total of 120 were built including two prototypes.
- Approved in 1967 the 1121A had overwing refuelling points with integral fuel tanks, new wheels, tires and brakes, improved cockpit lighting, maximum ceiling increased to 45,000 ft and all-up weigh to 17,500lbs, kept the CJ610-1 engines; 11 built.
- 1121B Commodore
- Version manufactured with CJ610-5 engines; 19 built.
- Unofficial designation for 1121 aircraft modified under a Supplemental Type Certificate with an increased all-up weight available from 1971.
- Improved version developed but not put into production; two aircraft built and subsequently converted to 1123 Westwinds.
- 1123 Westwind
- Improved version of the 1121. The cabin was stretched by 0.51m (1 ft 8in) and the aircraft was fitted with more powerful CJ610-9 engines developing 3,100 lbf (14,000 N) each and a Microturbo Saphir III auxiliary power unit (APU). 36 built
- 1124 Westwind
- Greatly improved version powered by two Garrett TFE731-3-1G turbofan engines developing 3,700 lbf (16,000 N) each, APU deleted.
- 1124 Westwind I
- Name given to 1124 after introduction of Westwind II.
- 1124N Sea Scan
- Maritime surveillance aircraft.
- 1124A Westwind II
- Refined version of the 1124 built from 1980 onwards.
- Pel-Air: 6 of which 4 are in aero medical configuration.
North Country Aviation, Gaylord, Mi. Chartered
- Helipro Fiji: 1 aircraft are in aero medical configuration.
- Mexican Air Force: Inactive
Specifications (1124A Westwind II)
Data from Jane's All The World's Aircraft 1982-83
- Crew: 2
- Capacity: 7 pax normal (maximum 10) / 1,474 kg (3,250 lb) max payload
- Length: 15.93 m (52 ft 3 in)
- Wingspan: 13.65 m (44 ft 9 in) including tip-tanks
- 13.16 m (43 ft) excluding tip-tanks
- Height: 4.81 m (15 ft 9 in)
- Wing area: 28.64 m2 (308.3 sq ft)
- Airfoil: IAI 54-12 (Sigma 1 modified)
- Gross weight: 6,010 kg (13,250 lb)
- Max takeoff weight: 10,660 kg (23,501 lb)
- Maximum ramp weight: 10,725 kg (23,645 lb)
- Maximum landing weight: 8,620 kg (19,004 lb)
- Fuel capacity: 4,345 kg (9,579 lb)
- Powerplant: 2 × Honeywell TFE731-3-1G turbofan engines, 16.46 kN (3,700 lbf) thrust each
- Cruise speed: 723 km/h (449 mph, 390 kn) economical at 11,890–12,500 m (39,009–41,010 ft)
- Stall speed: 184 km/h (114 mph, 99 kn) at max landing weight with flaps down and engines idling
- Never exceed speed: 868 km/h (539 mph, 469 kn) at 8,840 m (29,003 ft)
- Range: 4,430 km (2,750 mi, 2,390 nmi) 10 pax
- 5,385 km (3,346 mi; 2,908 nmi) with max fuel + 4 pax
- Service ceiling: 13,725 m (45,030 ft) maximum certificated
- 9,450 m (31,004 ft) on one engine at 7,030 kg (15,498 lb)
- 6,400 m (20,997 ft) on one engine at 9,072 kg (20,000 lb)
- Rate of climb: 25.4 m/s (5,000 ft/min) at sea level
- 4.17 m/s (821 ft/min) on one engine at sea level
- Wing loading: 372 kg/m2 (76 lb/sq ft)
- Power loading: 332.6 kg/kN (3.262 lb/lbf)
- Thrust/weight: 0.31
- Take-off run: 1,218 m (3,996 ft)
- Take-off balanced field length: 1,600 m (5,249 ft)
- Landing run from 15 m (49 ft): 747 m (2,451 ft) at max landing weight
Aircraft of comparable role, configuration and era
- Scott A. Thompson, Flight Check!: The Story Of Faa Flight Inspection (Government Printing Office, 1990) p108; "Jet Commander Flies", by Gerald J. Schlaeger, Flying magazine (April 1963)p30
- Frawley 1997, p. 123.
- Mark Huber (December 2018). "For many models, market hitting the apex" (PDF). Aviation International News. pp. 20–21, 24.
- "FAA Type Certificate Number A2SW." FAA. Retrieved: 4 January 2008.
- Hartoch 1979, p. 43
- Hartoch 1979, p. 44
- Hartoch 1979, p. 42
- Taylor 1982, pp. 124–126.
- Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.
- Frawley, Gerald. "IAI Westwind". The International Directory of Civil Aircraft 1997/98. Fyshwick ACT: Aerospace Publications, 1997. ISBN 1-875671-26-9.
- Taylor, John W. R. Jane's All The World's Aircraft 1982-83. London: Jane's Yearbooks, 1982. ISBN 0-7106-0748-2.
- Hartoch, Noam. Jet Commander - Westwind Tonbridge, Kent, England:Air-Britain (Historians), 1979. ISBN 0 85130 075 8
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