第四百零六章 火枪对骑射之一
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武昌城外，炮声隆隆，明军没日没夜的向清军开炮猛烈轰击，各种口径的实心炮弹、开花炮弹、榴霰弹和旋转的线膛炮弹下雨一样落在清军阵地上，清军苦心经营，耗费了巨资修建的工事堡垒，纷纷在隆纶声中轰然倒塌。龙腾小说ltxsba.com网
三十二磅加炮的实心炮弹和六十四磅臼炮的开花弹，是破坏工事群的主力，尽管拥有多门线膛炮，不过线膛炮装填太慢，炮弹造价昂贵，王余佑还是使用数量众多，炮弹造价较为低廉的滑膛炮当主力。
滑膛炮命中率是不高，可是架不量众多，铺天盖地的炮弹砸过去，总是有炮弹击中清军堡垒。
实心炮弹不断的砸在堡垒上，中弹的堡垒石头砖块迸溅，当即就被砸出一道道裂痕。接着又是一排沉重的炮弹呼啸而至，已经伤痕累累的堡垒轰然倒塌。
臼炮射的六十四磅开花炮弹不断落下，落在战壕上，腾起一团团巨大的火球，摧毁了成片的壕沟，把清军的工事炸成一片噶。
两门外形奇特的火炮正在向清军的城防工事猛烈开火射击，这两门火炮，正是明军用来试验的新式后装线膛炮。这种新式后装线膛炮，炮弹重量达到十八磅，单纯从炮弹的重量来看是一种重炮了，但是因为使用锥形炮弹，火炮的口径并不是很大，口径大概相当于六磅炮的口径，炮的重量相当于十磅炮的重量，大约重一千五百斤左右，可是射出的炮弹威力却比十八磅炮要大得多。
炮兵指挥官龚小大站在这两门大炮边上，看着这两门炮轮番射出炮弹。
“这种新式火炮，射还是挺快的。”龚小大心满意得的看着炮手们不断开火轰击清军的阵地。
后装线膛炮，射确实比前装炮要快得多，不仅比前装线膛炮的射快，而且比起前装滑膛炮来，射也快了很多。如此沉重的十八磅炮，射相当于三磅滑膛炮的射。只见炮手们拉动射绳，炮口便喷出一团火球。接着拉开插销，打开炮闩，清理了炮膛，再把一炮弹塞进炮膛内，然后装入定装药包，再装上底火，关闭炮闩，即可完成装填。
射火炮的时候，只需要拉动一下绳子，炮尾部的击针就会撞击底火，点燃药包，把炮弹射出去，使用起来十分方便。
可是一名炮手却说：“这种炮其实也没什么好的，射是快了，可是炮闩漏气严重，击针还容易折断，射十到十五炮弹，击针就断了，还要更换击针。另外，炮管也热得太快了，射一炷香时间，需要冷却两炷香时间。”
另外一名炮手道：“漏气太严重了！我们有兄弟不慎被喷出的气体烧伤；还有，泄漏的火药气体还烧断了拉火绳，不得不重新接绳子。如果不用拉火绳，没有人敢站在这种炮旁边拉火，很容易被烫伤。”
王余佑点了点头，转头对龚小大说道：“这种炮还有一个缺点，就是炮弹太贵了；炮弹的造价可以顶得上五十滑膛炮炮弹的造价了！”
“毕竟只是试验品，等以后钢铁技术展了，蒸汽机问世，这种炮和炮弹的造价都会降低下来的，炮闩漏气和击针容易折断的问题，也能得到解决。”王新宇回道。
身边几名背着双管击针火枪的枪手也说：“其实我们这种后装自生火铳也有这样的问题，后膛漏气太严重，多射几次，密封圈就破损了，火药气体喷出，会烫伤自己人。另外，击针也很容易断。”
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