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正文 027 钢板弩(第3页/共3页)

秋和张柯咋用呢,她们俩的力气肯定不够。

这时候有两个解决办法,一个是用偏心轮组,一个是用滑轮组。最终洪涛选择了滑轮组,虽然偏心轮组更有效,可是它也更复杂,不如滑轮好找。

弩臂两端各焊上一个滑轮,在弩身靠前三分之一的位置,一边也装上个滑轮,形成左右各一套定滑轮和动滑轮组。

初中物理老师教导我们说,定滑轮不省力,但可以改变拉力方向。弩身两侧的滑轮就是定滑轮,它把弓弦向后拉的方向给改了,变成弩臂滑轮向着定滑轮的方向。

而弩臂两端的滑轮就是动滑轮,初中物理老师又说了,动滑轮不能改变力的方向,但它能省力。省多少呢?一个动滑轮省一半!

知识这玩意很奇妙对吧,简单的四个小滑轮,几块钱的玩意,就能让一把可以射穿两寸木板的强弩,变成连十多岁小孩都能拉开的玩具!

张柯确实能拉开,也能端起来发射。不过这个玩意还是太糙了,没有望山不好掌握射击距离,严重影响了准确度。

下面就全是精细活儿了,找来门帘里的磁石条镶嵌在弩身上的凹槽里吸住弩箭,防止因为动作掉落。在弩身上开槽增加复位弹簧,进一步完善弩机。

磨圆磨光弩身木料,在不影响弩臂拉力的情况下做几个镂空处理,尽量减轻整体重量、调整重心。通过多次试射,大概找到落点散步,做出简单的望山……

雨都停了,中午饭也吃完了,洪涛还在天棚下面忙活呢。光有弩不够,还得有合适的弩箭。不锈钢筷子就那么两副,还不能被磁石吸住,没啥用。

以前钓鱼时在野外扎帐篷用的地钉倒是不错,原装的当然不灵,那些地钉就是凑合,又短又软,碰上碎石和泥土地面根本固定不住帐篷。

洪涛用的地钉都是找小加工厂订做的,半米长的结构钢,比筷子稍粗点,只要一分为二,再把圆头磨成三棱锥形,破甲能力还得翻倍! 『加入书签,方便阅读』

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