 | New member - basis questions| Aviation Discuss New member - basis questions in the World War II - Aviation forums; Originally Posted by syscom3
Harold.... not to confuse you, but at the beginning of WW2, the USN had 1.1 ... |
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12-29-2006, 02:09 AM
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#16 | | Senior Member
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Originally Posted by syscom3  Harold.... not to confuse you, but at the beginning of WW2, the USN had 1.1 inch MG's as a shipboard AA weapon.
1.1" = 28mm.
As events showed, this was a crappy weapon that was quickly replaced by the popular 20mm Oerlikon. | Strictly speaking, the massive four-barrel 1.1" was replaced by the 40mm Bofors - the 20mm Oerlikon replaced the .5" Browning.
Tony Williams: Military gun and ammunition website and discussion forum | 
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02-05-2007, 05:19 PM
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#17 | | Junior Member
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Sorry, not sure this is relevent to the thread but not sure where to post this but when diving in the English Channel last year I found a spent 20mm cartridge case. Stamped on the base is "43" and "W R A".
The case height is 100mm. I'ts ejector slot is indented on the case.
I presume this is an aircraft cannon but can anyone help to identify it further?
Cheers
Spike | |
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02-05-2007, 05:21 PM
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#18 | | Der Crewchief
Join Date: Nov 2004 Location: Ansbach, Germany
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__________________  US Army Blackhawk Crewchief 2000-2006 Classic ww2aircraft.net quotes: fly boy said: "isn't that the first jet bomber? becasue i have flown one in a flight sim before and i know how it handles" "wait what ok who made the b-2 crash come on people that messed up its a b-2" "ah yes the mistel those things are so annoying is games and in real life" | |
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02-05-2007, 05:33 PM
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#19 | | Junior Member
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Hope this works | |
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02-05-2007, 05:38 PM
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#20 | | Junior Member
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End view | |
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02-05-2007, 06:41 PM
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#21 | | Senior Member
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Originally Posted by Harold * Is there a general rule as to which type of gun (machine gun or cannon) would be mounted in a fixed position and which type would be able to swivel? I know a machine gun would have to be able to pivot. Otherwise the pilot would seem to be very limited as to when he could shoot.
| Early in WWl, several aircraft were armed with a gunner in front of a pusher (propeller in the rear) who could swivel a machine gun. A Frenchman by the name of Roland Garros (I suspect the same person the French tennis stadium is named after) fixed a forward firing gun on his tractor aircraft (propeller in front), mounted a deflecting steel plate to protect the propeller (which wasn't 100% successful) and soon demonstrated that aiming the aircraft, with shot down Germans, was a superior design. Add to this Anthony Fokkers syncronization gear on the propeller (interrupting the machine gun when the prop is in the way. Which was inspired by Garros aircraft after he shot himself down) on his German Eindecker fighter, and history was made. Since that time, nearly all fighters have had their primary machine gun armament fixed along the centerline of the aircraft. Wing mounted guns were aimed to converge at some selected point or points.
Last edited by davparlr : 02-05-2007 at 06:47 PM.
Reason: typo
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02-06-2007, 04:39 AM
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#22 | | Senior Member
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Originally Posted by spike_jones Sorry, not sure this is relevent to the thread but not sure where to post this but when diving in the English Channel last year I found a spent 20mm cartridge case. Stamped on the base is "43" and "W R A".
The case height is 100mm. I'ts ejector slot is indented on the case.
I presume this is an aircraft cannon but can anyone help to identify it further? | Are you sure its 20mm? It looks like a .50 Browning case to me.
It is much too long for an MG 151/20 case (82mm long) and too short for a 20mm Hispano (110mm).
Measure the diameter of the base. If it's around 20mm it's definitely a .50 BMG.
Tony Williams: Military gun and ammunition website and discussion forum | |
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02-06-2007, 10:23 AM
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#23 | | Junior Member
Join Date: Feb 2007
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Country: | Thanks for the reply.
As far as I can accurately it's definately 20mm and no more in diameter.
So if it's a BMG, would that be an aircraft gun or ship?
Cheers | |
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02-06-2007, 10:35 AM
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#24 | | Senior Member
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Originally Posted by spike_jones So if it's a BMG, would that be an aircraft gun or ship? | It's hard to say, since the same ammo was used in both. The RN did have a few .50 BMGs, and some later Spitfires as well as nearly all USAAF planes had the .50 as well.
It may depend on where in the Channel it was found. The further east, the more likely it is to be from an aircraft.
Tony Williams: Military gun and ammunition website and discussion forum | |
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02-06-2007, 01:22 PM
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#26 | | Junior Member
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Country: | oops, or is the 12.7mm the diameter of the actual projectile? | |
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02-06-2007, 01:33 PM
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#27 | | Der Crewchief
Join Date: Nov 2004 Location: Ansbach, Germany
Posts: 30,276
Country: | The projectile. With 20mm he is talking about the casing.
__________________ US Army Blackhawk Crewchief 2000-2006 Classic ww2aircraft.net quotes: fly boy said: "isn't that the first jet bomber? becasue i have flown one in a flight sim before and i know how it handles" "wait what ok who made the b-2 crash come on people that messed up its a b-2" "ah yes the mistel those things are so annoying is games and in real life" | |
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