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Ratzki -> RE: US Artillery in WWII: 105mm firing rate (4/19/2011 1:35:37 AM)
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quote:
ORIGINAL: freeboy
well, perhaps we should define accurate.. for the hunter hitingthe elk at 350 yards is awesome, for the competitive shooter 1000 yard tight groups are the goal.
The german 88 in anti tank role was very accurate, plus 2000 meters, from the anti tank gun or turretted versions... if you are looking for a cold to hot barrell calc and the goal is to put a round on a tank at 1000 -2000 then accuracy to me would be hitting it...
I am not saying that the 88 was not accurate, I am just noting that the long barrel might need the movement to keep it accurate at range. I thought that the discussion had moved to rates of fire and the 88's barrel movement after firing. I am not talking about hot/cold barrels either, but the movement all barrels have during projectile movement down the length of the barrel. Floating the barrel in a gun definately improves the hot/cold barrel warp from firing shell after shell, but it also helps by allowing the barrel to vibrate freely each and every shot. If viewed from a high speed camera, the gun barrels vibrate and move quite a bit as the projectile moves down and exits the end of the barrel. All barrels vibrate after they have fired. All barrels have to be "tuned" to the calibre being used. This is done in a number of ways from barrel length to barrel wall thickness, and others. Then once this "tuning" is found, the barrels can be mass produced to the same specs. I was thinking that an 88 is way bigger then anything I have ever seen shot so maybe this vibration/movement was needed to keep the round from tumbling or exiting the barrel off target. I thought that exponentially moving from a small calibre to a very large one might part explain why a better recoil system was not in place to help prevent this barrel movement in the 88. First it is a huge round and the projectile is moving fast enough that I would dare say that there is no moss growing on it along the way. It must generate a huge amount of recoil. I know that they must have had the ability to reduce this recoil, but as Yoozer pointed out, recoil is not only there but the barrel has this gyrating wobble as well. Would this affect the rate of fire? I wonder... maybe it was not an issue as the guy targetting the 88 would have to get off the first shot, then judging by the video clips, the target would probably have to be totally re-aquired as this gun kicks as hard as any and could be way off target for a second follow-up shot, by the time he is able to lock in on the target again this wobble is gone and is no longer an issue.
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