第五百二十四章 螺旋桨
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螺旋桨结构并不复杂。龙腾小说网ltxsba.com对于生产了大量龙尾车的李植来说，锻造一个勉强能用的螺旋桨并不是什么难题。虽然现代的螺旋桨十分复杂，不是明朝的技术能生产的。但要知道李植的船只是几百吨的船，这样的船对螺旋桨的要求和后世的千吨、万吨巨轮要求完全不同，李植拥的材料和技术是能够胜任的。
问题的难点在于螺旋桨的效率：螺旋桨整体的尺寸，桨叶旋转的角度，桨叶之间的距离都会影响螺旋桨的整体效率。
李植虽然是个工业设计师，但是对螺旋桨的研究并不深入。他所知道的知识，仅止于“优秀的螺旋桨效率高于明轮”这个程度。至于详细的参数，李植就一概不知了。
李植所能做的，只是不断地锻造不同参数的螺旋桨，然后装上轮船进行试验。
船上的明轮改为了螺旋桨，整艘船的结构也随之发生了变化。首先为了适应螺旋桨的位置，蒸汽机的位置移到了底舱，在首层甲板上只露出两个巨大的烟囱。蒸汽机被布置在底舱后，离船上的储煤区更近，节省了运煤的工作量。蒸汽机装到底舱后，船只的重心也往下移，船只更稳定了。
另外，因为卸掉了明轮，船上的炮位大大增加了。原先只能装二十门炮的四千料大船在改造为螺旋桨船后，可以安装二十八门火炮。几艘新造的五千料大船炮位更多，从二十四炮位变成了三十二炮位。如果李植的四十三艘轮船全部改造为螺旋桨式的话，李植的舰队一下子新增三百多个火炮炮位。
好在李植这两年铸造了大量的火炮，全部存在仓库里。山东的四个造船点停工后，火炮作坊生产的火炮数量远超过下水新船需要的数量，能够满足新炮位对火炮的需求。
李植选取了一艘新下水的五千料大船“鼎新”号作为试验船，率领木匠上船改造螺旋桨。虽然这艘船没有铁装甲，但是在底舱装些铁锭作为压舱物后，是可以模拟铁甲舰的。
螺旋桨上船后，是通过一根钢杆和蒸汽机连接的。这根传动轴上面装有轴承降低摩擦力，最后把动力传到船尾外部的螺旋桨上。
李植组织锻造工人开始锻造螺旋桨。这项工作纯粹是做试验，李植让锻工们打造了各式各样的螺旋桨，三叶的，四叶的。最后一个个装上鼎新号试用。
在鼎新号的旁边，还有一艘使用明轮的五千料大船。每次换一个新螺旋桨，鼎新号就和明船比赛速度。前面生产的三十几个螺旋桨效果都很不好，李植琢磨了好久，大幅度提高了桨面的尺寸，效率才有了较大的提高。
螺旋桨大船和明船比赛的情景是天津海边的百姓们不曾看过的。没有帆的船能开起来已经很令人匪夷所思了，但那种船毕竟还有个轮子划水，百姓们能看懂是机器带动划水轮子推动大船。但这螺旋桨大船干脆连划水轮子都没有了，却依旧神奇地高速行驶在海面上。天津的百姓们像是看到了神仙物事，每天都有大量的人挤到大沽码头上看热闹。
就连高立功这样号称见多识广的人，也是被这种新式推进设施震得一愣一愣的。螺旋桨试制进行了半个月，在竞赛中螺旋桨船暂时还没有战胜明轮船，但在高立功眼里，这已经是划时代的革新了。
“国公爷，这铁甲舰用上了螺旋桨，那就能用铁甲包裹全身了，当真是滴水不漏啊！”
“瞧那多出来的八门重炮，当真是威武啊！这一条大船三十二门大炮，一条船就可以开到日本去轰炸陆地炮台，劫掠沿海市町了。”
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