回帖231
主题6
精华0
积分954
金钱711
贡献0
阅读权限70
注册时间2010-9-25
最后登录2025-3-3
在线时间634 小时

中士

|
巴掌 发表于 2010-12-19 21:38 
身管短,达到相同炮口动能所需的装药量就大,膛压峰值就更高,所需的管壁就更厚。
炮口动能不变,以身管 ...
Investigations into the bore prematures suffered at Dakar determined that the standard SD21 charges used on the first day gave gas pressures that were significantly higher than expected. Modified SD19 charges used on the second day developed less pressure and thus did not cause bore prematures but the resulting lower muzzle velocity also gave less range. In order to avoid overpressure problems in the future the muzzle velocity was reduced to 2,575 fps (785 mps) after April 1942. The weight of these smaller charges is not known at this time.
|
|