第三百三十章 开花弹
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具体开炮时候，炮手根据敌舰的距离剪断一些引信长度，从而控制引信的起爆时间。舰炮开花弹只需要保证炮弹射入敌舰后再爆炸即可，爆炸时间上并不需要掐得太准，时间略长一些都可以。
插引信的口子上面需要用车床车出螺纹，木质延时引信身管上也有螺纹，这样可以把延时引信拧进炮弹里，不至于在飞行时候掉下来。
木质引信也很简单，就是一根中空的木管里面装上硬质黑火药。黑火药密度大时候会按照平行层规律稳定燃烧，达到延时点燃炮弹中爆炸药的效果。
木质引信的木管需要选用硬质木材。制造前要用先用醋液，之后再用明矾溶液浸泡木材，可以增强其抗燃性，防止木头被引燃带动下层黑火药燃烧。
早期不成熟的开花弹，炮弹中的火药和作为杀伤物的霰弹铁珠直接接触，这种炮弹比较危险，在射时霰弹珠相互碰撞有可能直接引燃火药引起炸膛，并且在飞行时也是，因此有效到达预定目标处的并且顺利起爆的炮弹很少。李植生产的改进型是将弹体炸药和霰弹珠用铁板隔离开，这样更安全，因为火药和弹丸是不接触的。
为了增加破甲能力，李植生产的开花弹弹壁是比较厚的。
在开花弹的后面，李植还给开花弹加上了木质弹托。
木质弹托和十样大，可以使大炮的射药点燃时密闭性更好。炮弹与木托是合二为一的，木托用铁片固定在炮弹尾部。这样炮弹在外弹道状态飞行时由于木托密度低，会使得炮弹的飞行时头部始终朝前，有类似羽毛球的头重尾轻自稳定结构，增加了射击精度。不仅如此，木质弹托还有缓冲膛压的作用，能够降低炮弹受到的峰值膛压。
铸造龙尾车的工匠和操作车床的范家庄车工在李植的带领下忙碌了几天，造出了这个时代最先进的开花弹。
李植把十八磅重炮推到校场上，试验这种开花弹的效果。
炮长根据李植的指导，在标有刻度的炮弹引信上瞄了瞄，用大钳子截短了一段引信。然后炮手们给大炮装击药，装射药，舂实火药，把连着木托的开花弹放入炮管中，舂实，瞄准两百步外的目标。
明代一步为一点五米，两百步就是三百米。
李植一声令下，炮长点燃了火绳后，撒腿跑到了十几米外。
开花弹是第一次试射，谁都不知道会生什么事情，还是躲远一点为妙。
只听到轰一声，开花弹射出了炮膛。炮弹打穿了三百米外的一片木牌，在木牌上打了一个大洞，落在木牌后面。
众人等了几秒钟，便听到轰隆一声巨响，那落地的开花弹爆炸了。火光四溅，十几斤的炮弹在三百米外炸出一片耀眼的火花。
李植看到那炮弹爆炸的火花，大喜过望。试想这样的炮弹射入敌人的舰船中，破坏力可想而知。8
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