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第128章 改进火炮计划(2 / 2)

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李老二经过观察,发现明军偏好佛郎机炮,因为佛朗机炮装填速度快。但装填速度快是牺牲了火炮膛压来达到的,这就造出了佛朗机炮威力不足的缺点。

按照当年火炮的膛压,李老二前世的时候翻看过炮兵资料,是在一百兆帕左右,换算的结果是每平方厘米要承受一吨的压力。

再看看佛朗机炮,大部分的膛压都是依靠子铳来承受,而子铳那薄薄的管壁,又能够承受多大的膛压呢?所以只能是减少火药装填量,这就是快速装填必须牺牲威力。

想要使得佛朗机炮能够摧毁后金军的盾车,那就需要千斤佛郎机,而千斤佛郎机也只能发射六磅炮弹,威力远不如大将军炮。若是说装填速度快,千斤佛郎机的装填速度也不会快到哪里去,一个子铳的重量都要达到百斤了,装填速度虽然比千斤大将军炮快了些,可是威力减少了太多。

针对佛郎机威力不足的问题,李老二首先考虑对子铳进行改造。若是加厚子铳的管壁,那么会增加重量,又会影响到装填速度;若是在子铳外面套上铁箍,那么子铳就无法放入炮腹中。所以李老二想到一个绝妙的好办法:制造铁芯铜壳子铳,内部是铸铁的管芯,外面套上铜壳,这样可以增加子铳能够承受的膛压,而且铜壳前段插入炮管内,又能增加佛郎机铳和子铳的气密性,减少漏气。

通州铁匠作坊内,李老二指挥工匠们,先是按照百斤佛郎机的子铳缩小了一圈,铸造出一个子铳。

“这子铳缩小了好一圈啊!”

“管壁太薄了吧?那么薄打出去会不会炸膛了?”

“不说炸膛,这东西放入炮腹,恐怕火药气体都要漏光了吧?”

工匠们议论纷纷,都觉得这个子铳做得毫无作用。

但是接下来,李老二便让人铸造一个比子铳铁芯略大一圈,长度长了三村的铜管。铸造好之后,趁着铜管温度未完全降低,以钳子夹住,套在子铳铁芯上。等到铜壳冷却下来,因为热胀冷缩的缘故,铜壳紧紧裹住了铁芯,这样就造好了一根铜壳铁芯子铳。

工匠们根据李老二的指导,在子铳内装入火药和弹丸。原本百斤佛郎机炮弹丸重量五两九钱,装药五两,经过李老二改进过后的子铳,工匠们装入了七两药。

“好了,可以试射了。”李老二令工匠们试射这门佛郎机炮。

因为增加了接近五成的装药量,负责点炮的工匠手持火把,战战兢兢的点燃插在火门上的导火索,点燃之后,一下就丢下火把,飞快的跑开,生怕炸膛。

百斤佛朗机炮发出一声沉闷的轰鸣声,炮口喷出火光,弥漫的白烟从炮腹和炮口处喷起,准确击中了一百五十步外的一面木靶子。炮弹击中木靶子,靶子当即粉身碎骨。

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