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第845章 五十斤重炮(1 / 2)

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张顺话音刚落,张都督便献宝似的卖弄道:“此万斤红夷大炮长一丈零七寸二分,外径一尺六寸,内径五寸六分,尾径阔两尺一寸九分,可装药二百四十两,射铁弹四百八十两。”

“炮成之后,声如霹雳,弹如雷霆,一炮糜烂数十里不止……”

“等等,等等!”张顺伸手制止住了张都督的吹嘘之词,迅速心算了一番。

一斤十六两,四百八十两不就才三十斤吗?

张顺记得铁的密度是每立方厘米七点八克,他曾利于测密度的方法反推出明代一斤约为六百克,明代一寸约为三点二厘米。

依次进行推算可知炮弹重十八公斤,火炮口径约为一百八十毫米。

完全不够啊!

张顺记得后世巨舰大炮时代,没有200mm以上主炮,都不好意思出门见人,甚至部分战列舰口径更是达到恐怖的400mm以上。

张顺蹲下来撅了个草棍,在地上写写算算半天,把草棍一扔,大嘴一张道:“原先设计太过保守,当把口径扩为六寸五,炮弹至少要重五十斤!”

张都督闻言差点哭了,我这设计是发射三十斤炮弹的重型红夷大炮。

您老大嘴一张,把弹药差点就给我翻番了,这不是开玩笑吗?

张顺是在开玩笑吗?当然不不是了。

他现在在铸炮过程中,多次实验以后,发现一个问题。

所有炸膛的火炮多是从火炮后半部分炸开,准确的说是从火炮药室处炸开。

从当初张顺利用红铜测算火炮各处受力分析来看,药室承受的压力要远远超过炮膛的其他部分。

也就是说西洋传来的模数体系,其实数据也存在很大的缺陷。

按照如今从西洋传过来的模数理论,如果火炮内口径是a,那么炮口壁厚为0.5a,炮口外径为2a,炮耳处壁厚为0.75a,底径厚度为3a,而炮长应该在火炮口径20倍以上。

张都督依照西洋模数设计的万斤红夷大炮,结果一放就炸,不得不加厚炮壁。

实际设计的火炮外径已经达到内口径的三倍;底径接近内口径的四倍,这也是该炮过于沉重的原因之一。

但是若以张顺实验的结果看来,这门万斤红夷大炮其实在药室这个关键部位用料明显不足,而在炮管等无关紧要的部位又用料较多,造成过多死重。

所以张顺的想法很简单,在加大万斤红夷大炮口径以后,只需要加强大炮的药室应该就能够满足要求了。

想到这里,张顺便问道:“这几次火炮炸膛,都大概开裂在何处?”

张都督满心不高兴,不过也拿自家主公没办法。

他只好皱了皱眉头,一边思索一边应道:“有六门……不,七门是后部炸开;有三门前端炸开,一门从中间炸开!”

哦?虽然和自己所想有些区别,但是好像并不是很影响结论。

张顺稍作思索,便明白其他部位炸裂,很可能是因为铸造质量的缘故。

他便笑道:“张先生莫要困扰,先以我的法子铸造两门一试,若是果然能成,岂不妙哉?”

“若是不成,再依旧法不迟!”

“好!”张都督一听,精神稍振,便向张顺请教新炮尺寸。

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