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Re:回 3楼(北落师门) 的帖子
skyline
11年9个月前
回复于
电磁炮
内容:兄弟,化学能炮同样的发射药前提下线膛炮的常规弹的射程是比滑膛炮射尾翼稳定弹的射程近的。,2战时候德国采用弹体自旋稳定的火箭炮口径最大装药最多的射程也没有超过10公里,同时期苏联的采用尾翼稳定的喀秋莎火箭尽管口径比德国的小装药比德国的少,但射程却轻松做到了20公里。,尾翼稳定不止起稳定弹体的作用,还会带来减少尾涡阻力的作用,常规自旋弹要是想减少尾涡阻力就必须采用尖尾设计,那种设计的自旋弹的尖尾结构的重量也不见得就比尾翼轻了,所以你说的尾翼会损失能量一说是没有科学依据的,尾翼稳定的缺点是弹体的结构复杂制造成本高不适合像自旋弹那样低成本批量制造,人类历史上口径最大装药最多的自旋稳定火箭弹的射程都没有超过30公里的,而采用尾翼稳定的火箭弹射程超过200公里甚至达到300公里的现在各个国家一抓一大把,,你居然说尾翼稳定的缺点是打不远??
电钻的妙用
王WZJ_97
10年4个月前
回复于
机械与工具
内容:用台钻更稳定好用
[原创]挑战技术极限——微型制导火箭DIY
拔刀斋
15年3个月前
回复于
喷气推进
内容:自旋稳定、只控制关机时刻?,引用第322楼普通用户于2009-10-14 21:48发表的 :某些弹道式的朋友,可以用翼旋转减速,一来增加稳定性,二来可以用单通道控制
Verity Instrument SD1024G光谱仪简单拆解与测试
qiuzheru
2年10个月前
回复于
拆机鉴赏
内容:用个汞灯试了下,看上去USB4000光机部分温度稳定性确实不行。
KNDX迷你制备机---项目--立项
ehco
14年3个月前
回复于
喷气推进
内容:波特率设置为115200bpS,N,8,1 能不能~~9600 这个稳定阿115200也很稳定 你是用有线传输的话9600嫌太慢了、反正是可选的 随你用哪个
关于电磁炮弹药的问题
friedel
10年8个月前
回复于
电磁炮
内容:张静茹 发表于 2014-5-16 22:45 便宜的螺旋铣刀 钻头啥的多好呀,自带膛线,增强稳定性呃。。,相反的还影响飞行稳定性(槽内会产生湍流)
搭个了温度记录仪
古法造轮
7个月9天前
回复于空间文章
搭个了温度记录仪
内容:稳定性还不知道呢,之前最长记录过一周左右,倒是没出过什么问题。
求教固体火箭稳定性
田宗平
9年8个月前
回复于
喷气推进
内容:引用 李松:模型火箭在飞行中受到扰动而其平衡状态被破坏后,能够自动恢复到原平衡状态的能力,称之为稳定性。,模型火箭的稳定性设计,对于保障飞行的安全性,以及提高模型火箭的飞行性能,有着十分重要的作用。 ,模型火箭稳定性设计必须遵循的首要基本原理,...
围海储电的设想
量子隧道
12年9个月前
回复于
极客DIY
内容:我记得美国人有个方法解决风能不稳定问题。,用高压直流输电缆把整个东海岸的风力发电机全连起来,互相补充,据说就能克服稳定性问题了。
出两个大电容,两个金属风扇
苦丁茶
11年7个月前
发表于
跳蚤市场
内容:电容60元一个,风扇全金属结构,耐高温设计,轴承不含油,噪音略大,不过运转十分
稳定。
新闻:美国批准氦气球游太空 需花费7.5万美元
woaini112108
10年11个月前
回复于
航空技术
内容:氢气代价低呀氢气球不稳定,易爆
菊水COS5041拆卸
rudolf
9年3个月前
回复于
仪器仪表
内容:我的也是这个型号,用了好几年,现在开机波形位置偏高,需要预热几分钟才会稳定
KNSB模型火箭的制作与发射(简易组装型)
zsjzsjzsj
2年3个月前
发表于
喷气推进
动手实践: 实验报导
内容:现在看来当时我似乎是忽略了质心和重心,以及配重的问题查阅相关文件资料:(基本飞行稳定性要求、火箭飞行稳定性)“对于模型火箭而言,由于一般不依靠调节及操纵系统控制火箭的飞行状态,所以所有型号的模型火箭都必须具备气动稳定性,而这种满足模型火箭正常飞行所必须的最小气动稳定性,又称为安全稳定性。,然而,偶尔也会有意外的情况发生,一些原本不稳定的模型火箭,在消耗掉一部分燃料后,其重心位置会前移,而导致其压力中心与重心的相对位置发生本质性的变化,在经过连续几个翻滚过后,在随机位置和状态下,模型火箭由不稳定转变为稳定,因此,发射不稳定的模型火箭是非常危险的,必须完全禁止。,至此,我们所讨论的内容仅限于模型火箭的静稳定特征,除此之外,模型火箭的稳定特性,还包括动稳定特征。
世舟二号模型火箭
zsjzsj
1年11个月前
发表于
喷气推进
内容:现在看来当时我似乎是忽略了质心和重心,以及配重的问题查阅相关文件资料(基本的飞行稳定性要求、火箭飞行稳定性)我们可以知道,对于模型火箭而言,由于一般不依靠调节及操纵系统控制火箭的飞行状态,所以所有型号的模型火箭都必须具备气动稳定性,而这种满足模型火箭正常飞行所必须的最小气动稳定性,又称为安全稳定性。,然而,偶尔也会有意外的情况发生,一些原本不稳定的模型火箭,在消耗掉一部分燃料后,其重心位置会前移,而导致其压力中心与重心的相对位置发生本质性的变化,在经过连续几个翻滚过后,在随机位置和状态下,模型火箭由不稳定转变为稳定,因此,发射不稳定的模型火箭是非常危险的,必须完全禁止。,至此,我们所讨论的内容仅限于模型火箭的静稳定特征,除此之外,模型火箭的稳定特性,还包括动稳定特征。
DIY 雕刻机 怎么省钱怎么干
zgchen
8年3个月前
回复于
机械与工具
内容:雕刻机稳定性是第一位啊!
欲打造史上最快电动自行车,现征集各种馊主意
ds4442002
11年9个月前
回复于
电动汽车
内容:轮胎必须保证高速时的抓地力和车体稳定性2.买2个大功率低KV盘式无刷电机和钢圈内侧的齿轮传动。
发一个自己的设计 自旋稳定火箭
msckmsck
13年10个月前
回复于
喷气推进
内容:另:发射自旋稳定火箭的导轨够长,如果火箭没达到稳定转速前离开导轨,火箭会摆动,散布很大
尾翼设计:气动自旋稳定与能量转化
X_02_wyvern
9年4个月前
回复于
喷气推进
内容:引用 蓬莱的鹰:我试过这个,效果不太明显,一般来说我们发射会用发射架,自旋控制会导致箭架间导向机构的作用力,会减慢出架速度,更不利于
稳定。
,典型的自旋稳定是107mm火箭炮炮弹,可是人家是用的是燃气涡轮自旋稳定的。
回 4楼(神の左手) 的帖子
拔刀斋
11年10个月前
回复于
喷气推进
内容:祝贺解决气氧煤油燃烧稳定性问题实现稳定工作!
[实验展示] [原创] 简化版“班氏试剂”的配制——碳酸根离子对二价铜离子的络合作用初探
smith
9年9个月前
回复于
化学
内容:个人感觉就是有这种配合物产生,也会很不稳定,如果是乙二酸我相信。,但碳酸根离子的碳在中间,是sp2等性杂化的,整个分子结构式平面三角形的结构,从结构上来看碳酸根作为单齿配体,其稳定常数K会非常小,实验肉眼应该极难观察到碱式碳酸铜沉淀溶解。
找到一个可以对电磁蛋道有改善的方法,赶紧去试试吧
outdatebox
9年1个月前
回复于
电磁炮
内容:引用 tengbo:塑料内壁和钢铁摩擦能用一两次吧,要想改善弹道,应该用尾翼稳定弹 只要弹头口径小一点就可以了,磨擦到的只会是海棉部分哦!,用尾翼稳定弹,有想过把管做成内十字或者内一字那样,做尾翼也是比较繁琐的一件事哦!
“脉冲激光测距”在特殊条件下代替微波多普勒装置对弹丸运动过程分析的可行性探究
WernerPleischner
2年7个月前
回复于
电磁炮
内容:激光测距不是这么搞的,NE555+RC频率稳定度根本不够,用寻峰法也很难稳定找到几纳秒的峰位差。
SK–100p高能固体火箭发动机的制作
拉格朗日L2点
1年8个月前
发表于
喷气推进
科创基金
内容:但多数kcer通常使用金属制喷管来作为此种发动机的喷管,此种方式虽然稳定,精细耐热性好,但价格对于大多数爱好者来说很难接受。
连载:DIY适用于高可靠应用的遥控器和接收器
虎哥
7年4个月前
回复于
电子技术
无线电
内容:更可能出现问题的是电路的不
稳定。
毒砂——砷黄铁矿
用户已注销
16年0个月前
回复于
地理与地质
内容:赞扬...拍摄水平见涨了...尤其是前两张...这类含有有毒元素且不太稳定的矿物本海豚一般不收集的...不过最后那个标本的确漂亮...
DIY 了个简单装置帮助提高晶体生长效率
warmonkey
1年9个月前
回复于
晶体养成所
内容:提高恒温精度最有效的办法是加大热惯性.传感器和控制器是最容易解决的,你只需要短期稳定度足够好的传感器,并不需要不确定度0.1°摄氏度的温度传感器.
遇到问题了……全硬件逆变器~~~
小真-真实
12年5个月前
回复于
电气电工
内容:这次我用了双绞线,至少有时候挺正常的工作,有时候工作不稳定……
自己设计制作一辆电动折叠车(持续更新)
20!Dopaminor
8年8个月前
回复于
极客DIY
内容:引用 power_rdx:这车稳定性怎么样?,9公斤在重量上似乎并没有优势,淘宝上的碳纤维滑板车重量普遍只有6公斤出头,且拥有更小的折叠长度 等等,让我们先欣赏一下,稳定性重量什么的不重要对吧。
4MHZ HF SSTC (桌面级迷你特斯拉线圈)
13920545020
9年11个月前
回复于
高电压技术
内容:用散热片可以解决的问题 基本电路也算正常,如果电路不合理加多大的散热片也没用,做电子的最主要的是工作稳定,效果适中就可以了,电弧1米工作不稳定也没什么意义
简谈火箭不稳定运动
卡卡西
2年10个月前
回复于
喷气推进
内容:算一星期不如风洞跑一小时,为了使火箭运动更加稳定,应该当实践与计算相结合,尽可能减少不稳定运动。
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