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水泥
电阻66mH磁环两只串联 、1200V0.33UF6只并联12V风扇散热,7812稳压背面槽路布线用8mm宽铜带15*7cm的板子正好布满带两只并联的高质量高压包
便携版电磁枪,十分便宜哦
13580080355
12年2个月前
发表于
电磁炮
内容:整体12v供电电源开关线圈555升压整流经改装的发射开关充电开关子弹威力帅气的我参数:450v470uf电容4个并联12v蓄电池铝管0.71的漆包线15米220v转12v变压器大功率堆桥
水泥
钉加工的子弹
关于火箭燃烧室.燃料与喷嘴
池塘
18年0个月前
回复于
喷气推进
内容:在不行,弄
水泥
混合云母片包裹在铁丝网上试试。
地震中逃生十大法则
jammama
16年3个月前
发表于
地理与地质
内容:此外,
水泥
预制板墙、自动售货机等也有倒塌的危险,不要靠近这些物体。 ,4.将门打开,确保出口 钢筋
水泥
结构的房屋等,由于地震的晃动会造成门窗错位,打不开门,曾经发生有人被封闭在屋子里的事例。,在1987年日本宫城县海底地震时,由于
水泥
预制板墙、门柱的倒塌,曾经造成过多人死伤。,务必不要靠近
水泥
预制板墙、门柱等躲避。
介绍一本新出版的科普书
kknd
14年8个月前
回复于
跳蚤市场
内容:如果LZ所谓“多种化工材料”包括钢筋
水泥
(混凝土不能算,沙石属于天然建材)的话,那么也请说清楚,不要以全代偏,以免误导儿章。。。
嘿嘿。。3D打印的24mmRNX发动机系列模具完工!
七公里垃圾站职业技术学院
9年0个月前
回复于
喷气推进
内容:不便于打磨)用在星孔上不错粉压堵漏王固话太慢,耐压也没粉压高强石膏好(硬度接近rnx,但要比rnx弱点,比湿法堵漏王强,固话也快)看来楼主是要做rnx的喷口 高强石膏对rnx怎么样我还没试,建议粉压耐火
水泥
内带
发动机喷头的一些东西
口贝
9年5个月前
发表于
喷气推进
内容:而且用的是不耐高温的普通
水泥
,在工作中喷口直径在变大,虽然初始浇注的内孔可能没有气孔,但随着直径的扩大肯定会有的,小的气孔对燃气影响较小但大的就保证不了了。,同时应为内部充满气泡
水泥
整体较脆,结构强度不好。
刀子算是做完了吧。。。不过理想和现实相差好远哦。。。。
chaozhou
10年4个月前
回复于
极客DIY
内容:下午买了一条600目的油石和一条天然石的磨刀石,多少目不知道,猜测两三千目吧,我们这管它叫粉石,深蓝灰色的,跟
水泥
的颜色差不多。
野生岩松鼠的人工喂养及繁殖,持续更新中
power_rdx
5年3个月前
发表于
生物学
内容:不过这次放它出来,我观察到了一个有趣的现象:它在厕所跑了两圈后,就停在墙角一个抹了
水泥
的地方舔地,我拿棍捅它也不跑。,略一思索,感觉这货可能是缺钙了,因为在抹了
水泥
的地方,残留了不少白色水渍,它就是在舔这些东西。
【基本原理讲解】关于喷管特性的说明
Einstein
9年5个月前
回复于
喷气推进
内容:我以前用
水泥
糊了一个,2cm的KNSU就裂了,不敢上3cm的燃料
找到一个验证DIY盖格计数器是否正常的好方法
ba5rw
4年3个月前
回复于
核技术与核仪器
内容:刚才试了一番,对着蓝天也是脉冲声音密集强烈,然而对着被阳光照的很亮的
水泥
墙,没有反应,但是瓷砖反射就很强烈。
嘿嘿。。3D打印的24mmRNX发动机系列模具完工!
mark42
9年0个月前
回复于
喷气推进
内容:忘记说了,我这次的喷口既不是耐火
水泥
,也不是石膏,是湿法堵漏王与二氧化钛的混合物1300℃的喷枪烧了60秒啥事没有
请问做个最简单的KNDX火箭多少钱
royel
14年1个月前
回复于
喷气推进
内容:PVC管子4块一米,做喷口堵头的快干粉,
水泥
什么的随便找个工地要点,买也不超过10块。
新做的火箭
子羽
16年0个月前
回复于
喷气推进
内容:至于拉瓦尔喷管
水泥
不好灌,灌出来也不能用一次性的.LZ可否考虑坛子里有个想做液体火箭的,找那个加工厂车个喷口出来,50块,不贵,还能重复用
有没有人玻纤布缠绕或者尼龙布缠绕浸渍环氧树脂制作耐压壳?
jetliao
13年6个月前
回复于
喷气推进
内容:不过可以分2步走,比如,先制造没有堵头而一体化喷嘴的外壳,这样还有好处,可以在喷嘴处设置消耗性的喉口,如ABC大大的环氧
水泥
,或者是酚醛压制的;然后制造球形堵头,用某种方法连接,当然这种方式需要试验。。
关于固体火箭的若干建议
理化生精英联盟
16年3个月前
发表于
喷气推进
内容:第一可以避免在高温时变软,还可以重复使用.如果使用薄一点的不锈钢材料做,比那些PVC管还要轻一些.喷嘴可以考虑使用石墨,我们实验室在上次做核反应堆的时候还剩余了几块石墨砖,下次做一下.主要是可以重复使用很多次,
水泥
的容易炸裂
混凝土火箭发动机电子推力采集测试台进行对小发动机的推力采集实验
LShang001
9年3个月前
回复于
喷气推进
内容:引用 地震带上的人:说实在的,这个试车台真正有使用价值的就是嵌在
水泥
里面的那个推力传感器。
关于PPR管道
usercim
13年7个月前
回复于
喷气推进
内容:做火箭发动机的确很合适,喷管可以用环氧直接混合
水泥
粉末。
DIY一个1-40000000Hz信号发生器,DDS芯片AD9850的使用
wkk123.
12年2个月前
回复于
仪器仪表
内容:我的应用是这样地.在建筑工地的
水泥
地面和梁柱内埋有PVC电线管,主体完成后要在这些线管中穿入电线.有的管子在施工中扁了或堵了.用钢丝可以伸到堵的位置,一般做法是一个人探钢丝一个人听声音找这个位置。
MREO-WX III 模型火箭发动机
kc276644985
8年10个月前
发表于
喷气推进
内容: 第一部分 喷管 喷管选用99瓷管作为喉衬,用
水泥
固定陶瓷管, 第二部分 堵头 与第二代机相同,采用了PPR热缩口工艺的堵头,在堵头内部填充了
水泥
,堵头内部 填充
水泥
后 [hr] 第三部分 药柱
标准化拉瓦尔喷口的制造【理论+实践】
black
14年10个月前
发表于
喷气推进
内容:接下来回顾一下大家做过的喷口:1:卷纸喷口(陶管+全纸)大家都在用,而且用的最多2:固化剂喷口(堵漏王or白
水泥
)也有蛮多的人在使用3:木质喷口 曾经看过有人使用,烧蚀严重4:自适应喷口 这算是非金属喷口中先进的一种了,,比如不见了啊,挂在树上电线杆上了啊,一旦发生无法挽回,相信你会很伤心的.....这样的话,作为业余发动机喷口的制造,也就是使用固化剂了,老外用这种喷口用的很多,什么都用,但是符合我们经济条件的也就是
水泥
和堵漏王了,,
水泥
便宜一包也就是10元,而堵漏王一包5元,都是制造喷口的好材料,白
水泥
是论坛上的人制造非金属大型发动机用得最多的一种。,这样一来,对于
水泥
来说,就非常不利了,因为
水泥
的固化是要掺入沙子的,而沙子是会不可避免的出现在工作面上的,这样一来在微观上就会使的气流在凹下去的地方的地方形成旋转气流,这样一来高温高压的燃气就会烧蚀喷口,这就是
水泥
的弊端,而且还存在着质量大,固化时间长等缺点,这对火箭来说是不利的..但是现在可以很好的解决这一问题了,另外一种容易得到的固化剂------堵漏王,这是一种很好的固化剂,是应豆腐渣楼房开发的一种堵漏剂
CR-1T发动机静态测试失败报告(图文+视频)
3ha510
15年1个月前
发表于
喷气推进
内容:堵头外层使用速干
水泥
,内层使用固化的融化葡萄糖。
关于金属发动机普及化方案的理论性探讨。
bkh123
12年5个月前
回复于
喷气推进
内容:引用第2楼鬼灯哥于2012-02-12 22:40发表的 : 堵漏王还不如用高岭土,玻璃钢材料制作复杂堪比车制 纯堵漏王偏软,纯
水泥
干不快,把两个结合起来。
东方红一号音乐电路(能不能复原一个?)
dctyu
13年4个月前
回复于
电子技术
内容:就原理来说,地动仪,用
水泥
都能糊出来。
第一次制作KNDX,发动机推力测试
3ha510
15年6个月前
发表于
喷气推进
内容:喷嘴用
水泥
浇筑,中心的喷口直径大约0.5cm。
关于碳纤维管对无线电信号的衰减屏蔽作用
虎哥
10年11个月前
回复于
喷气推进
内容:我们来看看玉兔1型(贵州安顺年会)所用的信标机,科创仪表局用了一周多的时间赶制的(主要时间都在等快递送器件来),经受了20楼摔落
水泥
地面的试验,在落地瞬间信号都没有中断。
一个制作喷口堵头的好材料。。。。。
a403564804
15年3个月前
回复于
喷气推进
内容:以上.还可以在潮湿基面上直接进行施工.用于抢险、道路恢复等,一小时就可恢复原状,四小时就可以通车;用于防水工程,带水带压,立刻止漏.本产品操作简单,仅加水调和即可使用,无毒、无害、无污染.可加入硅酸盐
水泥
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