How in the world do you assign kills to 20mm, when 5" and 40mm have been shooting at the same target before the 20mm even begins firing?
How do you assign kills to 40mm when the target may have already been damaged by 5" fire? Does the 5" only get credit when it downs a target before anything else begins firing?
Effective range during World War II against aircraft for manually aimed weapons rarely exceeded 1,000 yards (910 m), although USN Oerlikon gunners were expected to open fire at 1,200 or 1,300 yards (1,100 or 1,200 m) which allowed aiming corrections by the point the target entered effective range.
. This means that if there are a few aircraft attacking a TF, every 5" weapon in the TF that can bear on the target is going to open fire, even though most of them really don't have much of a chance of hitting the target because of their location and what the target is doing. Statistically, every one of those rounds fired is going to be tabulated to determine "rounds per kill" for the 5" gun, and that is a completely inaccurate way to determine the weapon's actual performance.
I think those statistics are also incorrect, because there was a lot of over reporting. I think I mentioned this before. An aircraft goes down. It was fired at in succession by 5", 40mm, 20mm, and .50 cal and it doesn't actually crash until the .50 cal shoots at it, but it has been on fire since shortly after the 5" opened fire. ALL weapon crews claim it, including every 20mm and .50 cal weapon on the ship. Let's say 50 crews claim the shoot down. Are you now going to claim 50 kills? How do you know which one shot it down?
Garyt wrote:Thanks Steve, that's where I get most of my info on naval weaponry.
Really the only Japanese light AA weapon of the war was the much maligned 25mm/60. Strictly as a gun only, it seemed to be fine. It had a good muzzle velocity and a maximum rate of fire in the 240 range. Unforunately there were other problems. It's loading system lowered it's effective rate of fire to 110rpm - a belt fed or feeding system similar to the 40mm bofors would have helped. ...snip...
OK, but note the mention there of the small magazine size, etc. Your rounds per kill don't mean as much if you aren't able to fire very many rounds.
The big difference between the 1.1 inch and the 25 mm Type 96 is that the 1.1 inch was water cooled but the Type 96 was air “cooled”. The 15 round magazine allows the barrel to cool while the magazine is being changed. If the IJN had wanted something like Bofor's system allowing continuous reloading, they would have had to add water cooling and the weight per barrel would have approached that of the 1.1 inc
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