Convair 990 Coronado

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Convair 990 Coronado
Swissair Convair 990 in flight.jpg
The Convair 990 is a low-wing airliner with four underwing turbofans.
Role Narrow-body jet airliner
National originUnited States
Manufacturer Convair
First flightJanuary 24, 1961
Introduction1962
RetiredSeptember 1987 (1994 with NASA)
StatusRetired
Primary users American Airlines
Spantax
Swissair
Produced1961–1963
Number built37
Developed from Convair 880

The Convair 990 Coronado was an American narrow-body four-engined jet airliner produced between 1961 and 1963 by the Convair division of American company General Dynamics. It was a stretched version of its earlier Convair 880 produced in response to a request from American Airlines: the 990 was lengthened by 10 ft (3.0 m), which increased the number of passengers from between 88 and 110 in the 880 to between 96 and 121. This was still fewer passengers than the contemporary Boeing 707 (110 to 189) or Douglas DC-8 (105 to 173), although the 990 was 25–35 mph (40–56 km/h) faster than either in cruise.

Contents

Design and development

American Airlines asked Convair to design an aircraft for coast-to-coast flights, able to fly nonstop from New York City to Los Angeles against the wind. They wanted a larger passenger capacity than the 880, which was the smallest of the first-generation U.S. jet airliners. It was known as the Convair 600 and was redesignated the Convair 990 in the month of its first flight. [1] The 990 began flight testing on January 24, 1961. [2]

One change from the 880 was the large anti-shock bodies on the upper trailing edge of the wings, to increase the critical Mach by reducing transonic drag. The inboard shock bodies, which were larger, were also used for additional fuel tankage. Later during the design period, Convair modified the design to include fuel in the outboard pods as well, but during the initial test flights the extra weight caused the outboard engines to oscillate in certain conditions. The pods were redesigned once more and shortened by 28 inches (710 mm), causing increased drag. The inner set of pods were used to route the fuel-dump tubes from the fuel tanks, terminating in a prominent outlet. [3]

The engines were also changed to the uprated General Electric CJ-805-23s, which were unique in that they used a fan stage at the rear of the engines, compared to the fan stage at the front of the engine found on the Pratt & Whitney JT3D that powered the 990's competitors. The engine was a simplified, non-afterburning civil version of the J79, used in supersonic military aircraft. Like most versions of the J79, the CJ805 and CJ805-23 were smoky, although secondary operator Spantax eventually had their engines refitted with low-smoke combustion chambers in the 1970s.

Like the 880, 990s incorporated a dorsal "raceway" added to the top of the fuselage to house the two ADF antennas and one VHF antenna. [4]

Operational history

Convair 990 Coronado cockpit Cockpit Convair Coronado Luzern.jpg
Convair 990 Coronado cockpit

The 990 did not meet the specifications promised, and American Airlines reduced its order as a result. The 990A was developed by adding fairings to the engine nacelles, among other changes. [5] Despite the modifications from the basic 880 and those in response to drag problems in testing, the aircraft never lived up to its promise of coast-to-coast nonstop capability from JFK to LAX. American Airlines' timetables show little or no difference in scheduled time between 707 and 990A flights. [ original research? ] AA began to dispose of its 990As in 1967.[ citation needed ]

During May 1961, one of the pre-production 990 aircraft, while demonstrating the margin between its operating speed and its capability during a dive at .97 Mach from 32,000 ft to 22,500 ft, reached 675 miles per hour (1,086 km/h) at an altitude of 22,000 feet (6.7 km): the fastest true airspeed ever attained by a commercial jet transport at that time. [6] [7] However, in level flight the maximum speed, 0.84 Mn, was less than that guaranteed to American Airlines, 0.89 Mn, because the drag levels with the anti-shock bodies were much higher than predicted. A drag reduction program was instituted during which streamlining of the engine pylon/wing interface and addition of nacelle fairings achieved 0.89 Mn. [8]

In 1963, the 990A was reported to burn 13,750 pounds (6.24 t) per hour of fuel at Mach 0.84 (484 kn; 897 km/h) at 35,000 feet (11 km) at a mass of 200,000 pounds (91 t). [9] In contrast, a modern Boeing 737 MAX 8 typically carries 162 passengers and burns 4,460 lb (2.02 t) per hour at Mach 0.78 (450 kn; 833 km/h) at sub-optimal parameters. [10]

Swissair 990A Coronado "St Gallen" at Manchester Airport in 1964 Convair 990A HB-ICC Swissair Ringway 07.64 edited-3.jpg
Swissair 990A Coronado "St Gallen" at Manchester Airport in 1964

Swissair bought eight 990As beginning in 1962, operating them on long-distance routes to South America, West Africa, the Middle and Far East, as well as on European routes with heavy traffic. Their fleet was withdrawn from service in 1975. Scandinavian Airlines (SAS) also operated 990A Coronados on their long-haul schedules to Tokyo and other destinations in the Far East and also to South America and Africa. [11]

The 990's niche was soon captured by the Boeing 720 and Boeing 720B, derivatives of the Boeing 707, and later by the Boeing 727. By the time the assembly line shut down in 1963, only 37 990s had been produced, bringing General Dynamics' entire production of commercial jet airliners to 102 airframes. The failure of airlines to broadly accept the Convair 880 and 990 led Convair's parent company, General Dynamics, to suffer one of the largest corporate losses in history. As a result, Convair exited the jet airliner business, although it later built fuselages for McDonnell Douglas, specifically for the DC-10, KC-10 and MD-11. [12]

When the major airlines retired their Convair 990s, they found a second life on charter airlines. Spantax of Spain had a large fleet until the mid-1980s, as did Denver Ports of Call. In 1967, Alaska Airlines purchased Convair 990 PP-VJE from Varig, and operated it as N987AS in scheduled airline service until 1975.[ citation needed ]

Variants

Operators

Interior of a Convair 990 operated by Swissair now on public display in the Swiss Museum of Transport, the Verkehrshaus der Schweiz in Luzern Interior of Convair 990 operated by Swissair.jpg
Interior of a Convair 990 operated by Swissair now on public display in the Swiss Museum of Transport, the Verkehrshaus der Schweiz in Luzern
NASA Convair 990. This aircraft has been retired, and is now on display at the entrance to the Mojave Spaceport. Convair 990 on ramp EC92-05275-30.jpg
NASA Convair 990. This aircraft has been retired, and is now on display at the entrance to the Mojave Spaceport.

*Original operators.

Accidents and incidents

Surviving aircraft

Specifications (Convair 990A)

Data from Jane's All the World's Aircraft 1965-66 [33]

General characteristics

Performance

See also

A Convair 990 (right, with distinctive anti-shock bodies) and a competing Douglas DC-8 (left, engine cowlings open) Swissair Douglas DC-8 and Convair CV-990 at Zurich from above.tif
A Convair 990 (right, with distinctive anti-shock bodies) and a competing Douglas DC-8 (left, engine cowlings open)

Related development

Aircraft of comparable role, configuration, and era

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References

Notes

  1. One Navy crewman in the P-3 survived the crash. He was in the P-3's tail section, which broke off the aircraft as the 990 collided from above. He fell out of the broken tail section and survived with massive injuries. People at the golf course who witnessed the crash tried to break open windows on the wreckage with golf clubs, in a futile attempt to pull the injured out before fire consumed the crews.

Citations

  1. "Convair Traveler Vol. XII 1960 61". 1953.
  2. Proctor, Jon (June 1996). Convair 880 & 990 (First ed.). Miami: World Transport Press. p. 55. ISBN   0-9626730-4-8.
  3. Proctor, Jon (June 1996). Convair 880 & 990. Miami: World Transport Press. p. 55. ISBN   0-9626730-4-8.
  4. Convair Jet Airliners. San Diego: General Dynamics: Customer Service Dept. December 1961. p. 203.
  5. "Reduction of Drag Rise on the Convair 990 Airplane". AIAA Journal of Aircraft, Vol. 1 No. 1, January–February 1964, pp. 8–12.
  6. "Aviation Week 1961-08-07". 7 August 1961.
  7. Lebanon (Pennsylvania) Daily News, May 18, 1961 p32
  8. The inside Story Of The Convair 990 The Fastest Subsonic Airliner In The World,John T.Kutney Sr.,AIAA 2007 5338,Figures 10,16,21
  9. Flight 31 Jan 1963 p150
  10. Fred George (May 12, 2017). "Pilot Report: Flying the 737-8, Boeing's New Narrowbody Breadwinner". Aviation Week & Space Technology.
  11. https://www.timetableimages.com/ttimages/sk/sk6404/sk64-05.jpg [ bare URL image file ]
  12. "Convair 990 Coronado: Too Fast Too Soon | International Aviation HQ". 2020-11-14. Retrieved 2023-04-10.
  13. "The Might-Have-Beens: Convair 880 and 990." Archived 2016-05-26 at the Wayback Machine Airliners.net. Retrieved: August 20, 2011.
  14. "World Airline Survey Flight International, April 14, 1966, p. 595. Retrieved: December 23, 2011.
  15. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Wegg 1990, p. 218
  16. 1 2 3 4 5 6 Wegg 1990, p. 219
  17. 1 2 3 4 5 6 Proctor 1994, p. 123
  18. Proctor 1994, p. 80
  19. Proctor 1994, p. 117
  20. Accident descriptionfor PK-GJA at the Aviation Safety Network
  21. Accident descriptionfor EC-BNM at the Aviation Safety Network . Retrieved on 2014-10-17.
  22. Images, Time Table. "Garuda Indonesia Time-Table". Archived from the original on 2018-01-01.
  23. Accident descriptionfor N5603 at the Aviation Safety Network . Retrieved on 2014-10-17.
  24. Gero 1997, p. 111.
  25. "Accident description: 12 APR 1973." Aviation Safety Network. Retrieved: August 20, 2011.
  26. Ranter, Harro. "ASN Aircraft accident Convair CV-990-30A-5 Coronado N712NA Riverside-March AFB, CA (RIV)". aviation-safety.net.
  27. "Convair 990, serial no. 02, N990AB". ConvairJet.com. Retrieved 26 September 2016.
  28. "Convair 990, serial no. 05, tuned into luggage tags". planetags.com. Retrieved 17 February 2022.
  29. "Convair CV-990 Coronado". verkehrshaus.ch. Retrieved 2015-11-11.
  30. "Airframe Dossier - Convair CV-990, c/n 18, c/r EC-BZP". Aerial Visuals. AerialVisuals.ca. Retrieved 26 September 2016.
  31. "Airframe Dossier - Convair CV-990-30A-5, c/n 29, c/r N810NA". Aerial Visuals. AerialVisuals.ca. Retrieved 26 September 2016.
  32. Edlind, Tony. "Spantax S.A (BX)". AngelFire. Tony Edlind. Retrieved 26 September 2016.
  33. Taylor, John W.R., ed. (1965). Jane's All the World's Aircraft 1965-66. London: Sampson Low, Marston & Company, Ltd. pp. 233–234.

Bibliography

  • Gero, David. Aviation Disasters. Yeovil, Somerset, UK: Patrick Stephens Ltd (Haynes Publishing), 1997. ISBN   1-85260-526-X.
  • Green, William. Macdonald Aircraft Handbook. London. Macdonald & Co. (Publishers) Ltd., 1964.
  • Proctor, Jon. Convair 880 & 990. Miami, Florida: World Transport Press, 1996. ISBN   0-9626730-4-8.
  • Taylor, John W. R. Jane's All The World's Aircraft 1965-66. London: Samson Low, Marston, 1965.
  • Wegg, John. General Dynamic Aircraft and their Predecessors. London: Putnam, 1990. ISBN   0-85177-833-X.