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Marinens Flyvebaatfabrikk M.F.9
The Marinens Flyvebaatfabrikk M.F.9 ''Høverjager'' ("Høver fighter"), also known as the Høver M.F.9 after its designer, was a fighter seaplane built in Norway in the 1920s.〔Taylor 1989, 620〕〔''The Illustrated Encyclopedia of Aircraft'', 2414〕
==Background==
In the early 1920s the Royal Norwegian Navy Air Service (RNNAS) began looking for a replacement for its Sopwith Baby fighter aircraft, contacting 19 foreign manufacturers asking for bids for licence production of four fighter aircraft in Norway. While many offers were received, only a few of the aircraft types on offer were for purpose-designed seaplanes. As it was the clear request of the RNNAS to have a tried and tested seaplane fighter only the bids coming in from Fokker and Nieuport Astra satisfied the requirement. As the cost of both these offers were considered far too high, Johann E. Høver, managing director at Marinens Flyvebaatfabrikk, recommended that a future fighter should be designed and constructed at his factory in Horten. Høver claimed that he could deliver four fighters with Hispano-Suiza engines at the cost of 220,000 Norwegian kroner, just half of what the foreign bidders demanded. After cost estimates and calculations had been carried out, the Norwegian Ministry of Defence approved the project on 8 March 1924. The project was then submitted to the Permanent Flying Commission ((ノルウェー語:Den permanente Flyvekommisjon)) and evaluated on 1 May 1924. Only Klingenberg, managing director of the Kjeller Aircraft Factory, had a negative opinion of the design, being especially critical of the choice of a relatively weak engine. The manufacture of parts for the prototype M.F.9 began in August 1924 and the wing construction was tested at an aeronautical institute in Göttingen in the German Weimar Republic,〔Hafsten 2003, 91〕 as well as being brought to breaking point in Horten. The Royal Norwegian Navy required the aircraft to have a top speed of 200 km/h, reach an altitude of 3,000 metres in 12 minutes and have a sturdy construction able to endure dog fighting. The aircraft also needed to be a stable platform and be easy to manoeuvre on water.〔Hafsten 2003, 92〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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