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送走张春等人之后的次日,杨林带着手下们来察看和试验红夷大炮的性能。炮手们按照命令早就把大炮运到了城外空旷之地,为的就是要试射火炮。

这六门红夷大炮可不是明朝后期的仿制品,而是实打实的欧洲货。只见这些大炮炮身长约一丈有余,炮管壁较厚,炮口口径较大。从炮管到炮尾呈纺锤形,也就是由前向后逐渐加粗,符合火药燃烧时膛压由高到低的原理。

在炮身的后部重心处有两个圆柱形的炮耳,火炮以此为轴可以调节俯仰角。整个炮身放置在铁制的炮车上,想要调整方向需要转动车身才行。

杨林想了想,按照历史记载第一批红夷大炮大规模输入明朝正是万历四十八年(公元1620年),也就是自己现在所处的年份。当时任广东肇庆推官的邓士亮,在沉没的英国东印度公司“独角兽号”商船上打捞出22门欧洲火炮。由此开始了红夷大炮登上中国历史舞台的历程。不过仔细看这六门火炮上下的缝隙,并没发现锈迹和海水腐蚀浸泡过的痕迹,应该不是那22门炮当中的火炮。

杨林围着这六门大炮又转了转,这些火炮为铜铁复合铸造,整体较重,估计约有二千斤左右。炮口口径约为五寸(14至16厘米),上面有准星和照门,可以利用抛物线的原理计算弹道。发射实弹、霰弹、链弹和空心爆炸弹等弹种。

“这六门炮最大射程是多少?射速又是多少?”杨林向一旁的阿尔弗雷多和安东尼奥问到。

“大人,这六门炮都是前几年新铸的大炮,如果仅是装填实心弹,有效射程可达一英里半(2414.01米),最大射程约为三英里(4828.02米)。如果是熟练的炮手操作,射速大概在三分钟到五分钟之间一发。”阿尔弗雷多非常熟稔的回道。

杨林暗中计算了下,红夷大炮的有效射程是指具有杀伤力的射程。而最大射程是指弹丸最远的飞行距离,杀伤力随着距离的增加而衰减。

红夷大炮属于前装滑膛炮,别看它又笨又重,它可是后世火炮的鼻祖。看来古人描述它“弹射五六里外,所到之处人马俱糜”的记载没错,不过这是实心弹的威力和射程,如果换成别的弹种就不一定能打这么远。

杨林指着前方一里处一辆损毁的盾车道:“以那辆车为目标,你们装填实弹来几发给我看看。”

“是,大人!”

阿尔弗雷多和安东尼奥指挥手下开始忙活起来。他们先是固定炮身和方向,接着清理炮膛并开始装填

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