Norsk Flyindustri Finnmark 5A

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Finnmark 5A
Honningstad 5-A 1.jpg
Finnmark 5A
RoleAmphibious airliner
National originNorway
Manufacturer Norsk Flyindustri
Designer Birger Hønningstad
First flightSeptember 1949
StatusScrapped
Primary users VLS
Norrønafly
Number built1

The Norsk Flyindustri Finnmark 5A (named for the Norwegian county) was an amphibious flying-boat airliner built in Norway in the late 1940s. The single prototype was operated by the VLS airline, but no orders for additional aircraft were received, and a refined version designated 5A-II was never built. The Finnmark was a conventional high-wing cantilever monoplane with twin engines housed in nacelles on the wings, and the first twin-engined aircraft constructed in Norway. [1] A specially-designed combination wheel-ski undercarriage retracted into wide sponsons on the sides of the flying boat hull.[ citation needed ]

Contents

This undercarriage (built by Dowty in England) was the subject of patents in Norway, Sweden, and Canada, and was constructed in such a way that the skis would be properly aligned for retraction and extension, and while lowered in flight, but would be free to move under landing forces, pivoting and deflecting to facilitate a smooth landing on rough snow or ice. [2]

The prototype Finnmark made its first flight on 17 September 1949, as a pure flying boat, being fitted with its retractable undercarriage in the winter of 1951–52. Before 1954, it was modified by removing its undercarriage, and replacing the sponsons by wing-mounted stabilising floats. It entered service with Vestlandske Luftfartsselskap that year, flying a service between Bergen, Haugesund and Stavanger. It was later sold to Norrønafly. [3] The airworthiness certificate expired in 1961, and the aircraft was scrapped in 1965.[ citation needed ]

Only one of the Cowlings avoided scrapping and is on display at the Norwegian Aviation Museum in Bodø.[ citation needed ]

Specifications (5A-II, as designed)

Data from Hönningstad Finnmark Amphibian [2]

General characteristics

Performance

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References

  1. Hagby, Kai (1998): Fra Nielsen & Winther til Boeing 747 : norske sivilregistrerte fly 1919-1998, p. 59
  2. 1 2 Flight 2 January 1953, p. 12.
  3. Stroud Aeroplane Monthly August 1993, pp. 62–63.