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Re: 20mm in Fokker D XXI
Hello there was only one FAF D.XXI with 20mm armament, FR-76. There reason given was that with its limited ammo supply (60 rounds per gun) and lower Rof it was not very suitable to fighter vs fighter combat and that anyway 7,7 mm Browning was still reasonable effective against Soviet bombers. Was it really so, it is debatable.
Tests in Finland in Dec. 37, cannon armament weighted 116,2 kg altogether incl. ammo, 2 wing mgs armament 60,4 kg.
It had effect on climbing turn etc. So cannon D.XXI was a bit less manoeuvrable.
But surprisingly no effect on climb to 6,000m, 7.93 min for both mg and cannon D.XXI. Cannon D.XXI was 1-1½ kmh slower in different altitudes. But Finns concluded that Oerlikon FF was unsuitable in fighter combat so only the test plane ever had cannon armament.
the only cannon armament D.XXI, FR-76, got 3 2/3 victories before cannon were removed after 20 Jan 40 during a major overhaul.
Juha
Last edited by Juha; 27th October 2008 at 21:35.
Reason: I corrected a couple grammar errors and put in a small clarification
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