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Fokker F.VII

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F.VII
The improved, three-engine F.VIIB-3m was the most numerous and successful type in the aircraft series; seen here in service with Linje Lotnicze LOT on the Warsaw-Bucharest route.
Role Passenger & military transport
Manufacturer Fokker
Designer Walter Rethel
First flight 24 November 1924
Introduction 1925
Status Retired
Primary users SABENA
KLM
Polish Air Force
Polskie Linie Lotnicze LOT
Produced 1925-1932
Developed from Fokker F.V
Variants Fokker F-10

The Fokker F.VII, also known as the Fokker Trimotor, was an airliner produced in the 1920s by the Dutch aircraft manufacturer Fokker, Fokker's American subsidiary Atlantic Aircraft Corporation, and several other companies under license. It was an airliner that could carry 6-12 people, depending on the version, and it used a variety of engines; early versions had one engine but three was more common.

This was an important airliner in the 1920s and 1930s; it was popular and made in several versions and used for record breaking flights. A variant of this aircraft, the F-10, was involved in famous aviation accident in that period that led to safety reforms in the USA. It was also used for an attempt to reach the North Pole, although there was a debate if it did reach all the way there: the aircraft was at least flown in arctic conditions in this attempt. Less controversially, it was flown in the first flight across the Pacific from Australia to the United States, and earlier it was used in flight from the United States to Hawaii.

In the 1930s, the aircraft began to fall out favor as newer designs that were larger, faster, and more streamlined entered service. Some major variations on this design included the Fokker F-10, which was bit bigger and could carry 4 additional passengers, and the Fokker F.VIII, which omitted the central engine to be twin-engined aircraft. The Fokker F.VII was also license produced by several countries including SABCA, Avia, Avro, and others.

Design and development

[edit]
F.VII prototype at Schiphol airport.
The Napier Lion engine exposed in the nose of a F.VII

The F.VII was designed as a single-engined transport aircraft by Walter Rethel. Five examples of this model were built for the Dutch airline KLM. One of these aircraft, registered H-NACC, was used in 1924 for the first flight from the Netherlands to the Dutch East Indies. In 1925, while living in the US, Anthony Fokker heard of the inaugural Ford Reliability Tour, which was proposed as a competition for transport aircraft. Fokker had the company's head designer, Reinhold Platz, convert a single-engine F.VIIA airliner to a trimotor configuration, powered by 200 hp (150 kW) Wright Whirlwind radial engines. The resulting aircraft was designated the Fokker F.VIIA-3m. Following shipment to the US, it won the Ford Reliability Tour in late 1925. The Trimotor's structure consisted of a fabric-covered steel-tube fuselage and a plywood-skinned wooden wing.[1]

The Fokker F.VIIB-3m had a slightly increased wing area over the F.VIIA-3m, with power increased to 220 hp (160 kW) per engine, while the F.10 was slightly enlarged, carrying 12 passengers in an enclosed cabin. The aircraft became popularly known as the Fokker Trimotor.[2]

The Fokker F.VIII (F.8) was similar, but a twin engine configuration rather than a trimotor, and it was bigger. The Fokker F.IX (F-9) had a similar configuration as the F.VII, but it was quite a bit larger and carried 20 passengers.

Operational history

[edit]
Seating arrangement in the 8-passenger F.VIIB-3m
The Southern Cross in 1943.
Fokker F.VIIB-3m (CH-190) operated by Ad Astra Aero
The Josephine Ford at The Henry Ford museum

The eight- to 12-passenger Fokker was the aircraft of choice for many early airlines, both in Europe and the Americas, and it dominated the American market in the late 1920s. However, the popularity of the Fokker quickly waned after the 1931 crash of a Transcontinental & Western Air Fokker F.10, which resulted in the death of Notre Dame football coach Knute Rockne. The investigation revealed problems with the Fokker's plywood-laminate construction, resulting in a temporary ban from commercial flights, more stringent maintenance requirements, and a shift to all-metal aircraft such as the similar Ford Trimotor and later Boeing 247 and Douglas DC-2.[3]

Pioneers and explorers

[edit]

The F.VII was used by many explorers and aviation pioneers, including:

Variants

[edit]
The F.VII with a single inline Napier Lion engine.
F.VII retrofitted with a Bristol Jupiter radial engine in KLM livery.
The French-registered F.VIIA flown for CIDNA (Compagnie Internationale de Navigation Aérienne).
America before its journey across the Atlantic, which was a Civilian C-2 version
F.VII
Single-engined transport aircraft, powered by 360 hp (270 kW) Rolls-Royce Eagle or 450 hp (340 kW) Napier Lion 12-cylinder inline engines, accommodation for two crew and six passengers; five built. One converted to use 400 hp (300 kW) Bristol Jupiter 9-cylinder radial and two to use 480 hp (360 kW) Gnome-Rhône built Jupiter VI engine.[14]
F.VIIA (F.VIIA-1m)
Single-engined transport aircraft; the capacity was increased to carry 8 passengers and the aircraft received a new, simplified undercarriage with suspension and aerodynamic improvements (the ailerons were contained within the profile of the wing and capped by rounded wing tips, the aircraft was equipped with an adjustable stabilizer). Flown on 12 March 1925. First aircraft had a 420 hp (310 kW) V-12 Packard Liberty engine, but a further 39 F.VIIA examples had mostly Bristol Jupiter or Pratt & Whitney Wasp radial engines.
F.VIIA-3m
The result of an attempt to improve the reliability of the aircraft by installing two additional underwing engines; flown on 4 September 1925. The first two aircraft were otherwise identical to the F.VIIA. From the third aircraft, the fuselage was 31 in (80 cm) longer and was powered by 200 hp (149 kW) Wright J-4 Whirlwind radial engines. Probably only 18 were built, while many F.VIIA were upgraded to the F.VIIA-3m standard.
F.VIIB-3m
Main production variant with heavier engines (offered were the 300 hp (220 kW) Wright Whirlwind, Armstrong Siddeley Lynx or 360 hp (270 kW) Titan Major radial engines) as well as a greater wing span and modified wing geometry; 154 built, including those built under licence.
F-9
American-built version of the Fokker F.VIIB-3m; built by the Atlantic Aircraft Corporation in the United States.
F-10
Enlarged version of the Fokker F.VII airliner, able to carry up to 12 passengers; built by the Atlantic Aircraft Corporation in the United States.
A C-2 of the United States Army
C-2
Military transport version of the Fokker F.9, powered by three 220 hp (164 kW) Wright J-5 radial piston engines, accommodation for two pilots and ten passengers; three built in 1926 for the US Army Air Corps.
C-2A
Military transport version for the US Army Air Corps, with greater wingspan, powered by three 220 hp (164 kW) Wright J-5 radial piston engines, accommodation for two pilots and ten passengers; eight built in 1928.
XC-7
One C-2A fitted with three 330 hp (246 kW) Wright J-6-9 radial piston engines. Re-designated C-7 when four C-2A examples were similarly reconfigured.
C-7
Military transport conversion of C-2A for the US Army Air Corps by re-engining with 300 hp (220 kW) Wright R-975 engines. XC-7 prototype and four C-2As re-designated in 1931.
C-7A
Six new production C-7 (Wright R-975) aircraft with larger wings, new vertical fin design, and fuselages patterned after the commercial F.10A.
XLB-2
Experimental light bomber version of the C-7, powered by three 410 hp (306 kW) Pratt & Whitney R-1380 Wasp radial piston engines; one built.
TA-1
Military transport version for the US Navy and Marine Corps; three built.
TA-2
Military transport version for the US Navy; three built.
TA-3
Military transport version for the US Navy, powered by three Wright J-6 radial piston engines; one built.
RA-1
Re-designation of the TA-1.
RA-2
Re-designation of the TA-2.
RA-3
Re-designation of the TA-3.

Licensed versions

[edit]
Avro 618 Ten
  • SABCA, 29 aircraft built.
  • Avia, 18 aircraft built.
  • Three aircraft built in Italy as the IMAM Ro.10, powered by three 215 hp Alfa Romeo Lynx (licence built Armstrong Siddeley) engines. Three built for operation by Avio Linee Italiane and Ala Littoria.
  • Plage i Laśkiewicz. Between 1929 and 1930, produced 11 examples of F.VIIB-3m, plus 20 of its own F.VIIB-3m bomber version (developed by Jerzy Rudlicki).
  • Three aircraft built in Spain.
  • Avro, 14 aircraft known as Avro 618 Ten used Armstrong Siddeley Lynx engines

Operators

[edit]

Civilian operators

[edit]
Historical poster with stylized Fokker F.VII for the Belgian airline SABENA
 Belgium
 Denmark
 France
  • CIDNA operated seven F.VIIA aircraft.
  • Air Orient operated eight F.VIIB aircraft.
  • STAR operated one F.VIIA aircraft.
 Italy
 Hungary
  • Malert operated two F.VIIA aircraft.
 Manchukuo
 Netherlands
  • KLM received all five F.VII aircraft and 15 F.VIIA.
F.VIIA of Polish carrier LOT powered by a Lorraine-Dietrich engine.
 Poland
  • Aero operated six F.VIIA aircraft for a short period in 1928. Since 1 January 1929, all aircraft were handed over to PLL LOT airline.
  • Polskie Linie Lotnicze LOT operated six F.VIIA and 13 locally license-built F.VIIB-3m between 1929 and 1939.
 Portugal
 Romania
Fokker F.VIIB-3m of Spanish state-owned airline CLASSA.
 Spain
 Switzerland
Pan Am Fokker F.VIIB-3m
 United States

Military operators

[edit]
 Belgium
 Belgian Congo
 Independent State of Croatia
 Czechoslovakia
 Ethiopia
 Finland
 France
  • French Air Force - five F.VIIA-3m and two F.VIIB-3m aircraft, impressed into military service in 1939/1940.
 Hungary
 Italy
Dutch bomber variant based on the F.VIIA-3m with bomb racks visible and large floodlights for landing in poor visibility; designated F.VIIA-3m/M.
 Netherlands
 Poland
 Spanish Republic
The slightly enlarged Fokker C-2A flown by the US Army Air Corps.
 United States
 Kingdom of Yugoslavia

Accidents and incidents

[edit]
Old Glory was used for an attempted transatlantic flight in 1927, but it was lost en route
  • On 7 September 1927, F.VIIA Old Glory (NX703) disappeared with Lloyd W. Bertaud and J. D. Hill at the controls, in an attempted transatlantic flight from Old Orchard Beach, Maine to Rome, Italy. The flight's last known location was in the North Atlantic, 960 km East of Cape Race, Newfoundland.[8]
  • On 17 September 1927, a Reynolds Airways F.VII (C776) crashed at Dunellen, New Jersey, due to loss of control following engine failure, killing seven of 12 on board. The aircraft was formerly operated by KLM, and had been imported to the United States.[21]
  • On 4 July 1928, Belgian financier Alfred Lowenstein disappeared during a flight over the English Channel as a passenger in Fokker F.VIIA-3m (G-EBYI), in unknown circumstances.[22]
  • On 15 August 1928, a Pan Am F.VIIA-3m, General Machado (NC53) ditched in the Gulf of Mexico off Egmont Key, Florida.[23]
  • On 4 July 1929, a Fokker F.VIIA-3m (G-EBYI) force landed near Mongalla, Sudan. Owner and pilot was Donald H Drew, three passengers included Glen Kidston, no casualties. Aircraft damaged beyond repair.[24]
  • On 11 September 1930, a Sabena F.VII (OO-AIN) crashed on climbout from Croydon Airport due to an in-flight fire, killing both pilots.[25]
  • On 30 October 1930, a Fokker F.VIIb/3m (CH-161) of Balair struck a chimney, and crashed in fog on approach to Essen/Mülheim Airport; three crew injured, three passengers unhurt.[26] See also Commons Category:Fokker F.VIIb/3m of Balair
  • On 6 December 1931, a KLM F.VIIb/3m (PH-AFO) crashed at Bangkok after failing to take off, killing five of seven on board.[27]
  • On 3 April 1940, a BOAC Avro 618 Ten (G-AASP, Hercules) crashed on takeoff from Cairo; there were no casualties, but the aircraft was written off.[28]

Specifications (F.VIIb/3m)

[edit]
Fokker F.VII/3m 3-view drawing from NACA Aircraft Circular No.74

Data from European Transport Aircraft since 1909[29]

General characteristics

  • Crew: 2
  • Capacity: 8 passengers
  • Length: 14.50 m (47 ft 7 in)
  • Wingspan: 21.71 m (71 ft 3 in)
  • Wing area: 67.6 m2 (728 sq ft)
  • Airfoil: root: Goettingen 386 (20%); tip: Goettingen 388 (11.3%)[30]
  • Empty weight: 3,100 kg (6,834 lb)
  • Gross weight: 5,300 kg (11,684 lb)
  • Powerplant: 3 × Wright J-6 Whirlwind 9-cylinder air-cooled radial piston engine, 220 kW (300 hp) each

Performance

  • Maximum speed: 210 km/h (130 mph, 110 kn)
  • Cruise speed: 178 km/h (111 mph, 96 kn)
  • Range: 1,200 km (750 mi, 650 nmi)
  • Service ceiling: 4,400 m (14,400 ft)
  • Takeoff and landing runs: 225 m (738 ft)

See also

[edit]

Related development

Aircraft of comparable role, configuration, and era

Related lists

References

[edit]
Wikimedia Commons has media related to Fokker F.VII.

Notes

[edit]
  1. ^ Thurston, David B. (2000). The World's Most Significant and Magnificent Aircraft: Evolution of the Modern Airplane. SAE. pp. 127–128. ISBN 978-0-7680-0537-0.
  2. ^ "Fokker F-VII." Archived 2007-03-24 at the Wayback Machine Aeronautics Learning Laboratory. Retrieved: 20 December 2010.
  3. ^ Mola, Roger. "Centennial of Flight information on the Fokker crash investigation." centennialofflight.net, 2003. Retrieved: 20 December 2010.
  4. ^ a b c Baaker, Leo. "Famous Fokker Flights." tiscali.nl.Retrieved: 20 December 2010.
  5. ^ "The Trans-Atlantic Flight of the 'America'." check-six.com, 19 October 2010. Retrieved: 20 December 2010.
  6. ^ "Accident Fokker F.VIIb/3m NX206". Aviation Safety Network. Retrieved 12 July 2020.
  7. ^ a b "Accident Fokker F.VIIa G-EBTQ". Aviation Safety Network. Retrieved 12 July 2020.
  8. ^ a b "Accident Fokker F.VIIa NX703". Aviation Safety Network. Retrieved 12 July 2020.
  9. ^ Naughton, Russell. "The Pioneers - Charles Kingsford Smith". Monash University Centre for Telecommunications and Information Engineering (CTIE). Archived from the original on 2010-02-10. Retrieved 31 March 2021.
  10. ^ "Question Mark." Archived 2005-11-09 at the Wayback Machine USAF Historical Studies Office. Retrieved: 20 December 2010.
  11. ^ Flight 15 August 1929, flightglobal.com
  12. ^ Flight 25 April 1930, flightglobal.com
  13. ^ Jones, D. (1971) The Time Shrinkers: the Development of Civil Aviation between Britain and Africa. Rendel. pp. 142–152.
  14. ^ Stroud 1966, pp. 466–467.
  15. ^ Borja, Elizabeth (27 February 2021). "The Dream of Abyssinia: Two Black Aviators and Ethiopia". National Air and Space Museum. Retrieved 3 March 2021.
  16. ^ Baugher, Joe. "Cargo Aircraft Designations." US transports, 11 August 2007. Retrieved: 20 December 2010.
  17. ^ Painter, K.M. "Help From The Skies." Popular Mechanics, November 1929.
  18. ^ "Incident Fokker F.VII H-NACL". Aviation Safety Network. Retrieved 12 July 2020.
  19. ^ "Accident Fokker F.VII H-NACC". Aviation Safety Network. Retrieved 12 July 2020.
  20. ^ "Incident Fokker/Atlantic F.VIIb/3m NC55". Aviation Safety Network. Retrieved 13 July 2020.
  21. ^ "Accident Fokker F.VII C776". Aviation Safety Network. Retrieved 12 July 2020.
  22. ^ "Accident Fokker F.VII/3m G-EBYI". Aviation Safety Network. Retrieved 12 July 2020.
  23. ^ "Incident Fokker/Atlantic F.VII/3m NC53". Aviation Safety Network. Retrieved 12 July 2020.
  24. ^ "Incident Fokker F.VIIa/3m G-EBYI". Aviation Safety Network. Retrieved 14 July 2020.
  25. ^ "Accident Fokker F.VII OO-AIN". Aviation Safety Network. Retrieved 12 July 2020.
  26. ^ "Incident Fokker F.VII/3m CH-161". Aviation Safety Network. Retrieved 13 July 2020.
  27. ^ "Accident Fokker F.VIIb/3m PH-AFO". Aviation Safety Network. Retrieved 12 July 2020.
  28. ^ "Incident Avro 618 Ten (Fokker F.VIIb/3m) G-AASP". Aviation Safety Network. Retrieved 12 July 2020.
  29. ^ Stroud 1966, pp. 480–481.
  30. ^ Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.

Bibliography

[edit]
  • Bowers, Peter and Ernest McDowell. Triplanes: A Pictorial History of the World's Triplanes and Multiplanes. St. Paul, Minnesota: Motorbooks International, 1993. ISBN 0-87938-614-2.
  • Dierikx, Marc. Fokker: A Transatlantic Biography. Washington, DC: Smithsonian Institution Press, 1997. ISBN 1-56098-735-9.
  • Howson, Gerald (August–November 1990). "Fokker's Trimotors Go to War". Air Enthusiast (13): 43–49. ISSN 0143-5450.
  • Ives, Don (December 1981 – March 1982). "Talkback". Air Enthusiast. No. 17. pp. 33–34. ISSN 0143-5450.
  • Molson, K.M. Pioneering in Canadian Air Transport. Winnipeg: James Richardson & Sons, Ltd., 1974. ISBN 0-919212-39-5.
  • Nevin, David. The Pathfinders (The Epic of Flight Series). Alexandria, Virginia: Time-Life Books, 1980. ISBN 0-8094-3256-0.
  • Postma, Thijs. Fokker: Aircraft Builders to the World. London: Jane's, 1979. ISBN 0-7106-0059-3.
  • Prins, François (Winter 1993). "Brisbane's Heritage". Air Enthusiast. No. 52. pp. 26–27. ISSN 0143-5450.
  • Stroud, John. European Transport Aircraft since 1910. London: Putnam, 1966.
  • Taylor, H. A. & Alting, Peter (April–July 1980). "Fokker's 'Lucky Seven'". Air Enthusiast (12): 24–38. ISSN 0143-5450.
  • Weyl, A.R. Fokker: The Creative Years. London: Putnam, 1965.
  • Wulf, Herman de (August–November 1990). "An Airline at War". Air Enthusiast (13): 72–77. ISSN 0143-5450.
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