Fokker F.II

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Fokker F.II
Fokker-Grulich F.II of the Luft Hansa in Dübendorf
Fokker-Grulich F.II of the Luft Hansa in Dübendorf
Type: Airliner
Design country:

German EmpireGerman Empire German Empire

Manufacturer:

Fokker

First flight:

October 1919

Commissioning:

1919

Production time:

1919-1925

Number of pieces:

23 to 25 (including licensed Fokker-Grulich buildings)

The second Fokker F.II delivered to KLM with the registration number H-NABD.

The Fokker F.II was a single-engine airliner for four passengers produced by the Dutch manufacturer NV Nederlandsche Viegenuigenfabriek . The prototype and the first series models were created between 1919 and 1921 at the Fokker Flugzeugwerke in Schwerin .

history

After the First World War, the Fokker-Werke in Schwerin had to stop producing military aircraft. The entrepreneur Anton Herman Gerard Fokker then decided to have civil models developed. The design work began in December 1918 under the direction of Reinhold Platz .

The first prototype V.44 provided open seats for the passengers. This idea was soon abandoned and the plane was scrapped before it even took off. The second draft, the FI (V.45), already had a closed cabin. Based on the prototype V.45, the series version F.II.

The first flight of the F.II took place in October 1919. A little later, a seven-hour flight from Berlin to St.Petersburg with seven passengers on board succeeded with it. The first machines were built in the Fokker factory in Schwerin. After its closure in 1921, production was continued in Veere , the Netherlands . From 1925 18 to 20 licensed buildings designated as Fokker-Grulich F.II were built in Staaken for German Aero Lloyd . These had previously been revised by engineer Karl Grulich, the manager of the Staakener shipyard, and given a modified driver's seat and landing gear as well as larger cabin windows. The resulting higher weight was compensated for by a more powerful BMW IV engine .

construction

The fuselage structure of the F.II consisted of welded steel tubes and was covered with fabric. The wings of the high- wing aircraft had a wooden structure and plywood cladding. The cabin, designed for four passengers, was located below the wings. In the open cockpit in front of it, another crew member or a fifth passenger could be accommodated in addition to the pilot.

A BMW IIIa engine was used to drive the first models . Since this turned out to be too weak, it was exchanged for an Armstrong Siddeley Puma on an aircraft delivered to KLM . Another example was subsequently fitted with a BMW IV engine.

The license version of the Fokker-Grulich F.II had a closed cockpit that was connected to the passenger cabin via a door. The drive consisted of a BMW IV engine, which was later replaced by a BMW Va on some models . Karl Grulich, technical director of Deutsche Aero Lloyd, was responsible for the revised plans.

use

The first customer was the Dutch airline KLM . The demonstration model had been smuggled out of Germany in 1920 because the victorious powers of the First World War had issued an export ban on aircraft. The first two machines delivered in August 1920 were used between Amsterdam-Schiphol and London-Croydon . KLM used the aircraft until 1927. She then sold two machines to the Belgian Sabena .

The Deutsche Luftreederei acquired the three series aircraft built in Schwerin and had them registered in the Free City of Danzig .

The machines built for Deutsche Aero Lloyd were taken over by Deutsche Luft Hansa in 1926 and used on domestic routes until 1934.

The prototype V.45 came into the possession of the Dutch institute Rijksstudiedienst voor de Luchtvaart in December 1920 . In 1936, Fokker bought the aircraft back as a museum piece. In May 1940 it was destroyed during the German invasion of Schiphol.

Users

German EmpireGerman Empire German Empire

SwitzerlandSwitzerland Switzerland

NetherlandsNetherlands Netherlands

  • KLM
  • Rijksstudiedienst voor de Luchtvaart

BelgiumBelgium Belgium

Technical specifications

Three-sided view Fokker F.II
Parameter Data (Fokker F II) Data (Fokker-Grulich F II b)
crew 1
Passengers 4th
length 11.00 m
span 16.10 m 17.60 m
height 3.66 m
Wing area 42.00 m² 45.80 m²
Wing extension 6.17 6.76
Preparation mass 1200 kg 1392 kg
Payload 700 kg 795 kg
payload 352 kg 403 kg
Takeoff mass 1900 kg 2187 kg
Wing loading 45.24 kg / m² 47.75 kg / m²
Mass / performance ratio 13.97 kg / kW (10.27 kg / hp) 11.89 kg / kW (8.75 kg / PS)
Power load 3.24 kW / m² (4.40 PS / m²) 4.01 kW / m² (5.46 PS / m²)
Top speed 150 km / h near the ground 170 km / h near the ground
Cruising speed 125 km / h near the ground 150 km / h near the ground
Rate of climb 2.36 m / s 2.50 m / s
Landing speed 70 km / h 80 km / h
Service ceiling 3800 m 4000 m
Range maximum 850 km maximum 900 km
Flight time maximum 6 h
Take-off / landing runway 250 m / 250 m 240 m / 250 m
Engines a water-cooled six - cylinder in - line engine
Type BMW IIIa BMW IV
power 185 hp (136 kW) 250 PS (184 kW)

See also

Web links

Commons : Fokker F.II  - collection of images, videos and audio files

Individual evidence

  1. ↑ Peter M. Grosz, Volker Koos: Fokker Flugzeugwerke in Deutschland 1912–1921, 2004, p. 71
  2. ↑ a b Wolfgang Wagner: The German Air Traffic - The Pioneering Years 1919–1925 . Bernard & Graefe, Koblenz 1987, ISBN 3-7637-5274-9 , pp. 197 .