MARINENS FLYFABRIKK M.F.9B, Norway

[Til_Dovre_Faller 191]

MARINENS FLYFABRIKK  M.F.9B

     Here with Hispano-Su iza Eigne                               Here with The Bristol Jupiter Eigne                     Here with Armstrong Siddeley Jaguar Eigne

 

One-seated Biplane fighter                      

13 planes

 

Built and Developed at: Marinens Flyfabrikk, Horten, Norway

Designed by: Johan Høver (1889-1980)

 

ARMAMENT

1x Colt 7.92x61 mm (Norwegian) Heavy Machine Gun

 

TECHNICAL DATA

Crew: 1
Length: 10.45 m
Wingspan: 7.77 m
Height: 3.12 m
Wing area: 28 m2
Empty weight: 860 kg
Gross weight: 1,230 kg
Powerplant: 

1x Hispano-Su iza 8F V-8 water-cooled piston engine, (30 0 hp )

Propellers: 2-bladed fixed-pitch wooden propeller

 

The F.130 was tested with the 450 Hk Bristol Jupiter radial-eigne

The F.130 was also tested with an Armstrong Siddeley Jaguar Eigne 

 

Performance
Maximum speed: 200 km/h 
Cruise speed: 150 km/h 
Range: 550 km
Rate of climb: 5.55 m/s
Wing loading: 44 kg/m2
Power/mass: 0.1749 kW/kg

 

Serial Nr      Nr         In service of the Norwegian Navy     Fate

81               F.122        31.05.1926 - 12.10.1935                    Discarded in 1935

82               F.124        26.05.1926 - 20.10.1935                    Discarded in 1935

83               F.126        15.05.1926 - 07.10.1936                    Discarded in 1936

89               F.128        02.08.1928 - 07.10.1936                    Discarded in 1936

90               F.130        10.08.1928 - 14.04.1931                    Total wreck/crash in Råde, Norway

91               F.132        18.08.1928 - 25.07.1930                    Total wreck/crash in Horten, Norway

92               F.134        05.07.1928 - 07.10.1936                    Discarded in 1936

107             F.136        11.08.1931 - 06.05.1939                    Not flown, Discarded in 1939

108             F.138        11.08.1931 - 06.05.1939                    Not flown, Discarded in 1939

109             F.140        11.08.1931 - 06.05.1939                    Not flown, Discarded in 1939

113             F.120        03.06.1930 - 07.10.1936                    Discarded in 1936

116             F.132         NOT FINISHED BUILT                      Discarded in 1932

117             F.130         NOT FINISHED BUILT                      Discarded in 1932

 

 

HISTORY

(There are 3 verisons of this plane with different eignes/armament, the history goes for all of them)

  

  After a few years, the Sopwith Baby was considered unfashionable as a fighter, and in 1923 the Norwegian Air Force "marinens flyvåpen" received permission to build four new aircraft. The navy wanted a proven sea fighter that could be built in Norway, but only 2 out of 19 manufacturers who were contacted had anything close to this. They were also too expensive to acquire. It was therefore decided to develop a separate fighter aircraft in Horten. Eventually the aircraft was named "Høver-jager" after the designer, Johan Høver. The prototype was ready in the summer of 1925, and the initial tests were so good that production of three aircraft was started immediately. These were completed in May 1926. The next four aircraft were ready in the summer of 1928.

 

  However, it turned out that the aircraft had a hereditary flatspin problem which caused several accidents and which could easily have had tragic outcomes. The planes were therefore rebuilt with larger side rudders and given the designation M.F.9B. Intensive work was done to solve the problem. The aircraft type was also tested with a larger, British 450 HP Jupiter engine on loan from the "Hærens Flyvåpen" and a 450 HP Jaguar engine on loan from England with good results. However, the costs would be too high with such engines, so the original 300 Hp Hispano Suzia/engine was eventually carried over

 

  More aircraft were built in the years to come, but due to the flatspinning problems, even with a completely new tailfin as on the M.F.9C, which also received larger side rudders and new float pads, 123 had to ask in May 1932 that work be stopped. The last two machines were not completed, and the 10 that were already ready were put in reserve. Most were officially scrapped in the autumn of 1936, but the last four were stored until 1939. The F.142 was preserved as a future museum aircraft, but was destroyed during the war. The idea of a sea fighter was now abandoned in Norway until we flew the Northrop N-3PB into the picture!

 

 

Colt 7.92x61 mm Norwegian Heavy Machine Gun

Spoiler

This was a Norwegian-developed cartridge that was only made for the Colt machinegun. This was a modification from the previous caliber that the machine gun was chambered for, namely 7.92x57mm

This cartridge has never been produced outside Norway, There are not known of any other guns chambered in this calibre.

 

A range of: 1200m

Bullet weight: 14.2g

Muzzle velocity: 760 M/S

Sleeve type: Bottle neck
Ball diameter: 8.18 mm
Sleeve length: 60.89 mm
Total length: 83.75 mm

https://ibb.co/dW0B4RV (pictrue)

One ball (left), one ball tracer (right), both made at Raufoss Ammunisjonsfabrikk

 

Pictrues

https://ibb.co/album/pBXDQy (pictrues)

PICTRUES

Spoiler

https://ibb.co/album/hRdSx5 (PICTRUES)

SOURCES

Spoiler

https://digitaltmuseum.no/011014275013/m-f-9-f-120-bygget-ved-marinens-flyvebatfabrikk-pa-stranden

https://no.wikipedia.org/wiki/7,92_×_61_mm

https://www.cartridgecollector.net/792-x-61-norwegian-mg

https://www.adlibris.com/no/bok/norske-militarfly-9788271286873?

https://www.norli.no/boker/dokumentar-og-fakta/historie-og-dokumentar/krig-og-historie/luftforsvarets-historie-fortalt-gjennom-75-gjenstander?

https://www.facebook.com/groups/1660092860961099

 

If you got additional information about this, please let me know :-)

 

Til_Dovre_Faller

[yoyolast 1,710]

Open for discussion. 

[Milocat 4,857]

+1 for Swedish/Scandinavian tree (with other '20s-era planes).