在经过多次成功和失败之后,我终于设计出下面这种制作二节式发声火箭的方法。 我想自己想办法制作工具,但效果都很差。我的一个AFN(美国烟花新闻)笔友告诉我一个将便士钉的头嵌进暗榫的办法,但它经常会掉出来,且钉子头经常粘有燃料,我还给一些AFN广告商写了信,最后得知生产此类制作发声火箭工具的厂家很少。 After many successes and failures, I finally designed the following method of making a two-pitch sounding rocket. I think I have a way to create tools, but the effect is poor. One of my AFN pen writers told me a way to insert a Penny nail into a dowel, but it often fell out, and the nail head was often stuck with fuel, and I also wrote to some AFN advertisers , And finally learned that there are few manufacturers that produce such rocket tools.