我现在想做一个火箭的模具，想用钠与水反应做向上的动力，请帮忙设计一个装置！好的给奖励100分
https://gss0.baidu.com/7LsWdDW5_xN3otqbppnN2DJv/difan/abpic/item/f122b6769e1a7901b051b9b0.jpg
有3个网友回答
首先，楼主你太有钱了，不考虑能量来说，钠那东西贵不说，而且还不好搞到手，而且很危险，对人的任一部位具有强烈的腐蚀性，对很多东西都有腐蚀。并且储存有巨大的麻烦，并且在拿出来在空气中还危险。你总不想你家起个火什么的。就是这些都解决了，可行了，机构也太复杂了。其实你想获得一个火箭模型最好用火药做动力，容易获得，结构简单，能在你的获得能力范围实现。只要你能获得火药。火药化学性质虽然活性也危险，但比钠要温顺多了，而且你可以通过现在配制的方法来获得。一个火箭的含药量不小。需要注意安全。可能需要50到100克左右。看你的灵活了，用纸做火箭发动机的壳体，要用牛皮纸。就是卷一个圆筒卷得5毫米的厚度就差不多很安全了。在卷的同时要用胶水来粘合。卷多大就看你心情了，但不要太小，太小，纸壳相对来说太重，不要太大，进入一种危险状态，大概2到3厘米就差不多了，胶水干把一头浸到水里，然后用一跟筷子或者铅笔插中间，然后用坚韧的线或细绳捆浸湿的一头，收口，用力捆紧做喷口，等干，拆掉绳子。拿纸团先堵住喷口，望里面倒少量火药，用木棒舂紧，注意一定要木头的，除非你想出些什么意外，因为细微火花和静电都可能点燃火药。然后插一个大概比一两根牙签粗的细木头插药室中间，注意舂实火药用的木棒中间要钻出一个比插的木棒要粗的孔，然后不断倒火药进去，舂实了，快装满了的时候用水泥将上头封住，在浇注水泥的时候和药室之间要有一层隔水层，用两层纸夹一些干的水泥粉。发动机就可以了。其他外壳还是用纸做，需要一些细木条和薄木板来构建骨架。用薄木板或厚纸板做尾翼。在药室里面舂实火药和在火药中插木条都是减缓火药的燃烧速度，想要加快速度的话就把药柱做成中空的管状。液体火箭太复杂了，不是你的能力能获得的。
可以做一下动力设计：需要关注以下变量：
1.你的模型设计总重M（牛）
2.使用的钠和水的质量
3.喷气出口大小
4.根据钠和水的反应式计算理论上的喷气速度（这里存在的问题是，钠与水的接触面积会影响气体的产生，进而影响燃烧产生的动力），这是难点，纯理论结果很难计算，更需要实验验证
5.根据动量定理计算可以获得的推力，精确计算的话，还需要考虑气体热力学和流体力学，用于计算燃烧获得的能量，和气体在喷气口的能量损失。
个人经验，高温气体做功，温度是第一要素，压力其次
其它的设计可能需要考虑一些模型的平衡，质量的分布，尾翼的设计等等
总的来说，如果做成玩具很简单
如果要做成设计不是很容易
纳那么贵，纳跟水反应才那么一点能量，要用这个做动力也太奢侈了吧
火药，汽油，酒精那个也比纳好吧
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