Fokker F.III

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Fokker F.III
Fokker F.III van de KLM 2161 026473.jpg
Fokker F.III operated by KLM
RolePassenger transport
Manufacturer Fokker
Designer Reinhold Platz
First flightApril 1921
Primary usersDeutsche Aero Lloyd
KLM
Number builtc.66
Developed from Fokker F.II

The Fokker F.III was a single-engined high-winged monoplane aircraft produced in the 1920s by the Dutch aircraft manufacturer Fokker. It could carry five passengers. The aircraft was also built under licence in Germany as the Fokker-Grulich F.III.

Contents

The design was quite popular when it was shown at the 1921 Paris Air Show, and it proved to be a successful early airliner. Although quickly surpassed by later designs in the 1920s, it was used on many early air routes in Europe. It was also involved in KLM's first air accident, which lead to radio's being required on aircraft.

Design and development

Anthony Fokker behind the controls of the F.III; the engine cowling has been removed. Anthony Fokker zit in de cockpit van een Fokker F.III 2161 026475.jpg
Anthony Fokker behind the controls of the F.III; the engine cowling has been removed.
Fokker F.III Fokker F.III (7585198454) (tight crop, grayscale, contrast).jpg
Fokker F.III

The Fokker F.III [1] was a straightforward development of the F.II. A widened cabin allowed all five passengers to sit within; in the earlier aircraft, one passenger sat alongside the pilot in his exposed cockpit. The pilot now sat alongside the engine, which was offset laterally by about 100 mm (3.9 in); whether to port or starboard depended on the type of engine installed. Although this unusual arrangement meant that pilots were "burned on one side and frozen on the other," they had a much better view than from the F.II. The view was further improved by a cut-out in the wing leading edge for the pilot's head, allowing his seat to be raised. The external wing struts of the F.II were removed, leaving a clean cantilever wing. The trapezoidal windows seen in the Grulich built F.IIs were standard on the F.III.

Like its predecessor, the F.III was initially powered by a readily available, war surplus 138 kW (185 hp) BMW IIIa engine, but once again KLM re-engined theirs with the 172 kW (230 hp) Armstrong Siddeley Puma.

A seaplane version was developed by Fokker, called the F.IIIw. However, this design did not go into production. The design had twin floats, and it had a longer fuselage and rudder. Such was the pace of aircraft development no blueprints are known, only several photographs. [2]

An improved model known as the F.IIIs was also made, and this had new fuselage and tail fin. It was also called the Grulich V.I. [3]

Operational history

Civilian air travelers in 1920; F.III in the background. Passagiers voor een Fokker F.III 2161 026476.jpg
Civilian air travelers in 1920; F.III in the background.
German license-built Fokker-Grulich F.III Fokker-Grulich F.III 2161 026480.jpg
German license-built Fokker-Grulich F.III
Grulich V.1 or F.IIIs, an improved model with a redesigned fuselage and tail Grulich V.1, een verbouwde Fokker F.III 2161 026481.jpg
Grulich V.1 or F.IIIs, an improved model with a redesigned fuselage and tail

The F.III was first used by KLM when they reopened their Amsterdam-London service on 14 April 1921 (they did not, at this time operate over winter). Soon, F.IIIs were also flying on routes to Bremen, Brussels, Hamburg, and Paris. They proved to be very reliable aircraft. KLM received 14 F.IIIs from Fokker's German factory at Schwerin during 1921 and built two more itself from spares in the following year. This final pair used 268 kW (359 hp) Rolls-Royce Eagle VIII engines, with the pilot on the left.

Another operator of new F.IIIs was Deutsch-Russiche Luftverkehrs Gesellschaft ( Deruluft ) which used nine aircraft on their Berlin-Königsberg-Moscow route from May 1922. These machines, partially built in Schwerin and finished in the Netherlands at Veere, had Eagle engines. One was a Fokker-Grulich.

Deutsche Aero Lloyd gained a licence to build F.IIIs as they had for F.IIs and the company, with its southern subsidiary built and operated 18 of these Fokker-Grulich F.IIIs. Most of these used BMW engines, typically the 186 kW (249 hp) BMW IV in preference to the 138 kW (185 hp) BMW IIIa. Some of these were re-engined with the 239 kW (321 hp) BMW Va, and were designated F.IIIc.

Another operator from new was the Hungarian airline Malert , which received six Dutch-built aircraft for their Budapest-Vienna-Belgrade service from 1922 to 1929. These initially had BMW IIIa engines, but later ran with 172 kW (231 hp) Breitfeld & Daněk Hiero IV engines. They had larger wings, increased in area by about 14%. Deutsche Luft-Reederei also operated two, originally intended for KLM. Four F.IIIs probably went to the United States.

Later F.IIIs changed ownership frequently as airlines went bankrupt or merged. They were still flying commercially in Germany until about 1936.

Accidents and incidents

The F.III as involved into two air crashes, that due to developing nature of air travel had a big impact. For example, one disappearance lead to the radios being required on aircraft.

Operators

A Swiss airline poster featuring the F.III from 1927 CH-000957-X-1114 Mangold.tif
A Swiss airline poster featuring the F.III from 1927
Flag of Australia (converted).svg  Australia
Flag of the Free City of Danzig.svg Free City of Danzig
Flag of Denmark.svg  Denmark
Flag of Germany (3-2 aspect ratio).svg  Weimar Republic
Flag of Hungary (1915-1918, 1919-1946).svg  Hungary
Flag of the Netherlands.svg  Netherlands
Flag of the Soviet Union (1924-1936).svg  Soviet Union
Flag of Switzerland (Pantone).svg   Switzerland [5]

Specifications

Fokker F.III 3-view drawing from Les Ailes 23 June 1921 Fokker F.III 3-view Les Ailes June 23, 1921.png
Fokker F.III 3-view drawing from Les Ailes 23 June 1921

Data from FOKKER COMMERCIAL AIRCRAFT from the F.1 of 1918 up to the Fokker 100 of today., [1] Jane's all the World's Aircraft 1924, [6] Flight 26 May 1921 : The Fokker F III Commercial Monoplane [7]

General characteristics

Performance

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References

  1. 1 2 de Leeuw, Rene (Editor); Stone, Serge (Illustrator) (1994). FOKKER COMMERCIAL AIRCRAFT from the F.1 of 1918 up to the Fokker 100 of today. Amsterdam: N. V. Konninklijke Nederlandse V. Fokker. pp. 22–29, 181–182.{{cite book}}: |first1= has generic name (help)
  2. www.dutch-aviation.nl http://www.dutch-aviation.nl/index5/Civil/index5-2%20F3.html . Retrieved 30 December 2023.{{cite web}}: Missing or empty |title= (help)
  3. www.dutch-aviation.nl http://www.dutch-aviation.nl/index5/Civil/index5-2%20F3.html . Retrieved 30 December 2023.{{cite web}}: Missing or empty |title= (help)
  4. "Lost Aeroplane. Unavailing Search For Dutch Machine". The Times. No. 43636. London. 26 April 1923. col F, p. 10.
  5. 1 2 3 www.dutch-aviation.nl http://www.dutch-aviation.nl/index5/Civil/index5-2%20F3.html . Retrieved 30 December 2023.{{cite web}}: Missing or empty |title= (help)
  6. Grey, C.G., ed. (1924). Jane's all the World's Aircraft 1924. London: Sampson Low, Marston & company, ltd. pp. 175b–176b.
  7. "The Fokker F III Commercial Monoplane". Flight . XIII (21): 355–359. 26 May 1921. No. 648. Retrieved 21 May 2019.

Further reading