第三百六十四章 火炮
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众笑过后，丁度留下，曾公亮便跟着许清俩人一起往将作监去，路上曾公亮笑道：“子澄啊！瞧你高兴的，我怎么觉得你不象司农寺少卿，倒更象将作监的人啊！”
“曾侍制，这回算你说对了，你问问蔡老，晚辈是不是将作监的官儿！”
蔡元明先是一愣，接着朗笑道：“没错，子澄还真是我们将监的属官，他身上还有个将作监中校丞的官职呢，老夫怎么把这事给忘了，子澄啊！照说你领着我将作监的俸禄，可已有多时没来将作监啦，再这样下去，老夫说不得要到陛下那里去弹劾你了！”
“弹吧！弹吧！昨个儿陛下那才接到三本弹劾我的奏章，今天还没有呢，蔡老您赶紧，说不定能抢到第一位！”
“哈哈哈！”
三人一路谈笑，来到铸造作坊，准确的说应该叫铸造局，大宋连铜钱都是在这里铸造的，铸造工艺自然不同凡响。
说来大宋有各种炮可不少，有单梢炮、双梢炮、五梢炮、七梢炮、虎蹲炮、柱腹炮、旋风炮、合炮、卧车炮、车行炮，以前许清听说时也十分兴奋，娘的，连车行炮都有了，这不是自行火炮吗？那干翻西夏和辽国有何难？
可谁知一看实物，却全是使用机械力的投石车。
为此根据许提供的一些简单的概念，铸造真实的火炮，可以说是一切都是从零摸索，用了近一年时间，才弄出一门样炮，许清岂能不期待万分。
一进铸造局大院，就见一车子上架着一根炮管，长两米左右，炮身重心两侧有圆柱型炮耳，可以此为轴调整射击角度，还按他原来所述，似模似样的装有准星、照门等，炮车有三个轮，前一后二，可由马匹拉行。
蔡元明亲自上来介绍道：“这门火炮采用精铁铸造，管身长六尺二寸，炮口阔三寸，接许少卿所述，按炮口薄，炮膛厚的方式整体模铸成，总重两千四百斤，最远可及两里半……”
许清听了这个数据，微微有些失望，才两里半，要知道明朝后期的红衣大炮可是有里的射程啊！
不过想想，这是第一门火炮，能有两里多射程也算是过得去了，射程的问题取决于气体的密封程度，这个不是一时能达到高精度的，得慢慢加以改进才行，关键是看质量如何，炸膛率高不高。
“蔡老，测试过炮堂的寿命没有？能经受得住几炮？”许清直接就自己关心的问题加以询问。
蔡元明颔首说道：“此炮共放过八炮，目前还没发现什么问题。”
“这不行，得多试一些，一直试炸膛为止，看看最终能经受得住几炮，若是只能经受住一二十炮，那利用率就过低，计算起成本来，就很是不合算了！”
也不能光说不练，在许清的要求下，火炮被拉到试炮的空地上，试炮的工匠开始装药，由于是前装炮，时间有点久，许清看他们小心翼翼地装药后压实，放入铁弹，然后才把炮口慢慢仰起。引信放得很长，点燃后便远远躲开。
轰的一声，透过浓浓的硝烟，炮车那边摇晃不停，若不是有绳子固定着，怕已被巨大的后坐力冲飞了，炮声一过，许清带头冲出来，先将炮膛观察了一翻，发现没什么异样，只是炮膛里的结碳不少，再射的话得从新清理过才行。
最终结果报上来，射程确实在两里半左右，接着再射，这回射的是散珠弹，数百颗铁珠随着火光喷射而去，远及一里多，远远望去，肉眼尚可见弹珠的轨迹，里外的空地上如同下了一场弱雨，噼噼啪啪的撞击声让有听得发悚，若是在敌人攻城是发射，确实可以造成大面积杀伤。
最终这门炮管在第十一炮过后，炮管便出现了裂痕，加上原来蔡元明说的八炮，那么炮管寿命只有十九炮，这个利用率着实底了些。
“蔡老，这门火炮造价计算过了吗？”
“前后加起来，共计花费两万贯左右。”
许清眉头一皱，这么贵的造价，利用率又这么底，想大量列装是不现实的！
铜炮倒是不容易炸膛，不过就许清所知，铜炮同样存在诸多缺点，一是造价会更高，二是纯铜铸炮太软，射击时很容易造成炮膛扩张，影响射击精度不说，射程也会很快下降。
“蔡老，这价格先不说，主要是炮管寿命太短，这很不合算，晚辈曾听说过另一个锻打的制作方法，就是先把钢条烧红，然后缠绕在原本上进行锻打，如此反复加钢条往上绕，逐渐制成钢桶装，把火炮原形造出来，然后继续加钢条缠绕，直至膛壁厚实后为止，最后再整体淬火，回火。”
“嗯，子澄说的倒也有道理，那咱们不防试这种方法！”
几人找来工匠商议了许久，才出铸造局，虽然这炮各项指标都还不高，但许清已经非常高兴了，只要有了一个好的开始，慢慢摸索下去，总有一天能得出满意的结果来！
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