RNoAF Marinens Flyfabrikk M.F.9C

TYPE: One-seated Biplane fighter
BUILT AND DEVELOPED IN NORWAY AT: Marinens Flyfabrikk, Horten
DESIGNED BY: Johan Høver (1889-1980)

2x Colt 7.92x61mm Norwegian Heavy Machine Gun

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: 1 × Hispano-Suiza 8F V-8 water-cooled piston engine, (300 hp)
Propellers: 2-bladed fixed-pitch wooden propeller

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

The M.F.9C received larger side rudders and new float pads

SERIAL NUMBERS - times in service and fates

(There are 5 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


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

Two-7-92x61mm-Norwegian-Heavy-MG-cartridges hosted at ImgBB — ImgBB

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

7.92x61 — ImgBB



M.F.9C — ImgBB



M.F.9 F 120, bygget ved Marinens Flyvebåtfabrikk, på stranden - Norsk Teknisk Museum / DigitaltMuseum
7.92 X 61 NORWEGIAN MG | Cartridge Collector
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