第二十八章 、古代科技
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是勋得信，也感头痛，于是便跟诸葛亮商议，不如把马德衡派去水师中，让他研究一下有何改进舟船，使便于逆水航行之法吧。马钧得了此命，倒是挺欢欣鼓舞，但觉吾此斫轮手，又得用武地也，赶紧就快马赶去了彭蠡。
其实舟船的研和改装，绝非一朝一夕之功，若然真的去岁便即伐蜀，说不定鲁肃水师仍然派不上多大用场，会被甘宁硬生生堵在瞿塘峡以东。可是既然延后了整整一年，马德衡也不是吃素的，终于被他搞了令人瞠目结舌的新花样出来。
先，马钧明了“轮船”。
这里所说的“轮船”，是指原始意义上的有轮之船，又称“明轮车船”，在原本历史上要在五百多年以后才会出现，到了宋代始得大行——钟相、杨幺即驾车船横行洞庭，后来宋军车船又在采石堵住过完颜亮的南侵大军。这种机械的原理倒是非常简单，即在船只外侧安装数个巨大的木轮，通过齿轮和皮带传动，以人力踩踏旋转，划水前行。马钧造此“轮船”，还是受到了他老爹当年在乡中所制水车的启。
踩踏船轮比之划桨，人力未必俭省，但动力更为强劲，而且方便统一使力。马钧造出了这种轮船……还是叫车船吧，便即于江上试验，果然逆水仍可疾行，鲁肃不禁抚掌大喜。然而把这种车船运到秭归附近，后世的西陵峡上试验，却现动力仍嫌不足——逆水再也快不起来了，慢得跟乌龟爬一般。
马钧筹思良久，突然又从新式的礟车上得到了启——经过他和诸葛亮改良的新式礟车，不再用人力拖拽稍杆了，而代之以绞盘。于是马钧就在船上各轮内侧多置一绞盘，横以四张巨弓，当绞盘摇起，便即拉开巨弓，一旦松开绞盘，则弓臂所产生的动能足可驱动明轮转动，比五十人踩踏还要大力。于是，受是勋的影响，但完全没有是勋指引向，完全偏离原本历史的崭新的“黑科技”就此出笼。
如今鲁肃所率那十多条巨大的楼船，就全都既装了明轮，又装了绞盘，启航时便即摇起绞盘，等到松开纤索，放开绞盘，明轮疾转，当即劈波斩浪，直向鱼复城下驶去。有了绞盘助力，再踩明轮，真正是轻松无比、事半功倍，数十里的水路转瞬即过。
当然啦，只有这些大楼船才能装设如此复杂而沉重的装备，其余中、小船只，要么只能踩踏明轮，要么连明轮都安不上，而只能摇桨，度根本快不起来，只好远远地在后面跟着——其中部分小船因为动力不足，转眼间便即倾覆了，或者被迫倒退，其疾如箭地便折返回了秭归。
只是光前面那十多条大楼船也已经很恐怖了，船上密布箭橹，火药箭、焙烙罐尽皆齐全，此外尚置拍杆，船头设一具烈风连弩。甘宁时在鱼复城中，使部将詹晏统领水师，双方甫一接触，蜀船便即大溃，三成倾覆，余皆惊骇而走——魏军倒也折损了四条楼船，基本上都是明轮转动太，最终散架所造成的自伤。
余船拢岸，鲁肃麾下骁将丁奉年方弱冠，双手各舞一长刀，当先跳纵而上，赶杀蜀军守江者。鲁子敬下令，说既已下锭，除留极少数人守船外，其余人等——包括踩踏明轮的——都必须执械登6，但得一，即授民爵！重赏之下，人皆踊跃，很快便夺占了鱼复城外的港口。
甘宁闻报大惊，急忙率军出城来战。这边鲁肃才刚夺取港口，尚未来得及筑垒、列阵，便遭蜀军冲击。他麾下大群力夫本就缺乏战阵训练，方才跟随丁奉打顺风仗颇显勇略，真等踢中铁板，当即四散，反倒冲乱了自家队伍。丁奉保着鲁肃狼狈而走，逃归船上，甘宁还想跳帮夺船，就听鲁子敬一声令下：“施弩！”
每条楼船的船都设有一架烈风连弩，弩身是固定的，但弩臂还可以左右各做九十度的回旋，早就歪过来瞄准着岸上啦。于是十数具连弩一时激，蜀军当先者多被洞穿，就连甘兴霸本人也险险中矢，被迫挥师后退。
于是就在连弩的遮护下，魏军于舟上重整队列，再次放下跳板，一行行排列整齐，二度登岸。随即也不走远，就背靠舰船树木为篱，开始搭建营垒。鲁肃这回不敢下船去了，但是吩咐，小心地拆下一半连弩往岸上运，然后即以连弩杂以步弓，尝试一点点地把蜀人驱远，好彻底占据港口。
其间甘宁率军连冲了两次，都被敌弩逼退，不禁气得暴跳如雷。他跟王平商量，说敌械甚锐，难以遽破，只能暂且熬到天黑，然后我再率数百敢死精锐趁夜前去斫营。王平说此计甚妙，但：“将军乃巴军主将，岂可轻动？平愿往也！”
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