Fokker F.25

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F.25 Promotor
Zijaanzicht van het prototype van de Fokker F25 Promotor (2161 026938).jpg
Fokker F25
General information
TypeCivil utility aircraft
Manufacturer Fokker
Number built20
History
First flight October 20, 1946

The Fokker F.25 Promotor, first flown in 1946, was a single-engined, twin-boomed, four-seat passenger monoplane with a pusher engine mounted at the rear of a central nacelle. It was of wooden construction and has fitted with a retractable nosewheel undercarriage. One feature of the design was that instead of a 2 + 2 seating, the pilot sat in front to the left, and all three passengers were on a bench seat to the rear of him. Alternatively, when being used as an air ambulance aircraft, it could carry a patient on a stretcher, which was loaded through a hatch in the aircraft's nose. [1] The F.25 was evocative of the pre-war G.I design. [2]

Contents

During World War II, Frits Diepen, a car dealer, had a twin boom aircraft powered by a 98 hp (73 kW) Ford V-8 engine designed and built at Bergen-op-Zoom. This aircraft emerged postwar as the Diepen Difoga 421 aircraft, and was flown for the first time in 1946, but proved unsuccessful. [3]

Diepen then contracted Fokker to design and build a new aircraft of similar layout to the Difoga, which became the Fokker F.25 Promotor. Diepen intended to use the Promotor as an air taxi and charter aircraft, placing an order for 100 aircraft, and also negotiated exclusive sales rights to the Promotor. The first example made its maiden flight on 20 October 1946 and later that year was exhibited at the Paris Air Show. [4]

Production was stopped in 1949 after 20 F.25s had been completed. They could not compete in cost against large numbers of surplus military aircraft available at bargain prices following the end of the war, while Fokker required its production capacity to concentrate on the Fokker S.11 Instructor trainer. Only three of the aircraft were flown. [5]

Specifications (Fokker F.25 with O-435-A engine)

Fokker Promotor 3-view drawing from Les Ailes February 8, 1947 Fokker Promotor 3-view Les Ailes February 8, 1947.png
Fokker Promotor 3-view drawing from Les Ailes February 8, 1947

Data from Jane's All the World's Aircraft 1947, [6] Promotor In The Air [7]

General characteristics

100 kW (140 hp) at 2,300 rpm at 1,000 m (3,300 ft)

Performance

850 km (530 mi; 460 nmi) with maximum fuel
1,000 m (3,300 ft) in 7 minutes 12 seconds
2,000 m (6,600 ft) in 16 minutes 6 seconds
3,000 m (9,800 ft) in 30 minutes

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References

  1. ↑ Smith Flight 5 August 1948, pp. 143–144.
  2. ↑ Flight 3 October 1946, p. 359.
  3. ↑ Hooks Aeroplane March 2013, pp. 31–32
  4. ↑ Hooks Aeroplane March 2013, p. 32
  5. ↑ Hooks Aeroplane March 2013, p. 34
  6. ↑ Bridgman 1947, pp. 153c–154c
  7. ↑ Smith Flight 5 August 1948, p. 145.

Further reading

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