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Old 18th May 2009, 04:05
kennethklee kennethklee is offline
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kennethklee
Re: gun synchronization to fire through propeller arc

Quote:
Originally Posted by kolya1 View Post
Yes, there were effectively some biplane fighters with 4 guns firing through the propeller's arc : I can think of the Polikarpov biplanes : I-15, I-15bis, and I-153. The early models had PV-1 MGs while the late ones used ShKAS, which must have been quite difficult to synchronise, because of their very high rate of fire (1800 rounds/min unsynchronised). The MiG-3 also usually carried 3 guns in the nose above the engine (2 ShKAS, 1 UB). The La-7 had usually 2 ShVAK 20mm guns, but by the end of the war versions with 3 lighter B-20 guns appeared. The post-war La-9 and La-11 had 4 NS-23 23mm guns.

I don't know if that is among the reasons why some air forces favored wing guns and other fuselage ones, but I think I once read that Soviet pilots who fired at close range complained about the disposition of the Spitfire's armament. I suppose it's possible that air forces that emphasized deflection shooting preferred wing guns which covered a wider area...
Quote:
Originally Posted by Graham Boak View Post
I suspect there were biplane fighters with 4 fuselage-mounted machine guns, although I can't think of one offhand. The Me 209-II had a similar wingroot mounting to the Fw series. The La 7 is nagging at me - there were versions with three cannon in the fuselage and others with either two or four. My books are temporarily out of reach.
I have a trivial but perhaps interesting follow-up to the discussion about Russian fighters carrying more than 2 fuselage-mounted synchronized cannon: I just discovered today that the IL-2 Sturmovik 1946 WWII combat flight simulation game models several versions of the La-7 fighter, one of which carries three 20mm cannon in the engine cowling. The model seems visually accurate, down to the assymetrical configuration (2 on the left, 1 on the right) of the cannon. For those who are not familiar with this aerial simulation game, IL-2 is amazingly historically accurate in its attention to detail in the aircraft it models, some of which are historically obscure, as well as the simulation of combat flight.

Kenneth
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