第一百八十七章 氢气飞艇
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自从硫suan大批量投入生产之后，制取氢气已经不是难事。更多小说ltxsba.com宋应星科学院院长宋士意根据王羽制导的方法，把liu酸稀释了，做出稀硫suan，再用铁来同稀酸发生反应，即可获得氢气。把获得的氢气收集起来，就做出氢气球。
不过王羽并不满足于氢气球，气球的外形空气阻力大，运行速度慢，因此在他的提议下，科学院的科学家们造出了纺锤型的氢气飞艇。
可是从气球过渡到飞艇，而且是氢气飞艇，问题又来了：飞艇的飞行高度越高，空气压力就越小，空气压力小了，气囊内的氢气就变得越稀薄，气囊就会膨胀。一直膨胀下去，飞行高度越来越高，最终的结果就是气囊承受不住内部压力而被胀破，飞艇在空中爆炸，落得艇毁人亡的下场。
为了解决这个问题，一开始宋士意的设想是在气囊上安装一个阀门，一旦气囊膨胀，就放出气囊内的氢气。但是氢气放掉之后，就无法再升高，而且飞艇要降落，必须放掉气囊内的氢气，飞艇才能落地。
毕竟这个年代的氢气获得不容易，是一种很昂贵的气体，而且飞艇是在前线执行侦察任务的一种飞行器，这个年代又没有造出压缩机和密封性极好的气罐，氢气无法液化，不便于携带，所以必须要找到一个办法来解决飞艇升降的问题。
于是王羽想出的解决办法是双气囊结构，这就类似于潜艇的原理了，在外气囊内部还有一个内气囊，外气囊内灌入的是氢气，内气囊内灌入的是普通空气，有阀门和手摇式鼓风机控制内气囊内的空气排放和注入。飞艇要升空的时候，打开阀门，把内气囊内的空气放出一部分，这样内气囊就缩小，氢气受到的压力减小，膨胀，飞艇便升空。进入一定的高度之后，内气囊里面的空气压力减小，膨胀，挤压外气囊的氢气，使得氢气不再膨胀，这样就能保持一定的高度飞行。
飞艇要降落的时候，摇动手摇式鼓风机，把空气注入内气囊，使得内气囊的压力增大，挤压外气囊内的氢气，氢气的体积缩小，比重加大，飞艇自然就会下落。
这艘氢气飞艇的气囊是用价格昂贵的丝绸涂上杜仲胶做出，造价十分昂贵，相当于一艘双体快帆船的价格，但是里面的氢气不会泄露，能多次使用。飞艇的吊篮内坐着四个人，以脚踏式螺旋桨驱动飞艇，使得飞艇的时速可达十六公里每小时。
明军大营内，一根粗木桩上系着缆绳，氢气飞艇悬停在低空，吊篮距离地面不过三尺。这艘飞艇是经过试验的，安全性能还是比较可靠，不过王羽也没必要自己冒险去登飞艇，毕竟氢气很容易起火。
琼州军什长赵峥带着自己的三名兄弟，从用木箱堆起的小高台爬上了飞艇。
“准备起飞！”王臣下了命令。
赵峥转动了吊篮内的起飞阀门，从内气囊内有一根丝绸管穿过外气囊，伸入到阀门上。丝绸管用杜仲胶来密封，不会漏气。
美洲来的橡胶树已经开始大量的在南洋和海南种植，生产出天然橡胶。但是因为硫化橡胶的技术还未成熟，橡胶还无法用来制作鞋子和轮胎，也无法用来制造通气管道，迫击炮炮弹的闭气环，后装炮的炮闩闭气装置和后装枪的闭气装置。而飞艇内的管道又不能用重量较大的铁或者铜制造。为了解决这个问题，内部管道也是用丝绸制造，把丝绸覆盖在铁丝上面，再涂上杜仲胶密封。
赵峥打开了阀门，比重比空气轻的氢气膨胀，挤压内气囊，使得内气囊内的空气通过阀门排出。
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