第四十九章 尼米茨的反击(3)
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除叶片加工精度改良外,叶片材料也进行了改进,用上了锰铜合金,虽然不如现代复合材料制作的螺旋桨,在1944年代也算当之无愧的高级。
除螺旋桨降噪外,在内部降噪也下了大工夫,扩大了发动机基座弹簧减震浮筏的运用,利用扩大的排水量扩大艇体外壳覆盖“阿里贝里奇”橡胶消声瓦的厚度和尺寸,从原先的30mm提高到45mm。内部各个管线也包裹了厚实的消声材料。
其余21型的特点继续予以保留:如艇首装备主被动声呐基阵,可精确定位敌船并计算鱼雷射击参数;加厚的高屈服度钢艇壳使下潜深度达到400米;不够成熟的T5声导鱼雷未上舰,但线导鱼雷开始陆续上舰。
经过测试,23型潜艇在速度提升2节情况下,最高速度运行时噪声反而比21型降低近10个分贝,在正常状态下能低15个分贝。本来21型的噪声水平已独步全球,现在有了23型,更是配得上“大洋黑洞”的美誉。
当然23型也有不少问题,比如成本高——1艘23型等于2艘21型等于4艘VII型潜艇的价格,建造周期长、施工难度大等等缺点,但无论海军上下还是霍夫曼对此都非常满意,因为这是潜艇界的虎王!军备部批准了建造12条的预算,要求到1945年6月必须全部完工。
在霍夫曼的眼里,23型潜艇还有更大潜力——可为下一步升级至核攻击潜艇奠定基础。
至于基于伊-400为基础设计,满载排水量7500吨,单条造价1亿马克,可实现全球部署的庞然大物——XXX级弹道导弹潜艇也在紧锣密鼓地建造中,预计1945年3月份就能看到首舰竣工,这才是真正的超级潜艇!
手头有越来越犀利武器的邓尼茨根据形势的转变,开始把潜艇大量派往加勒比海执行任务,亚速尔、加那利群岛、佛得角都成为潜艇补给基地,其中亚速尔条件最好,但距离战场偏远,佛得角最贴近前线,但条件最差。不过对航程超过1.5万海里的XXI潜艇来说,这点路程都是毛毛雨。美国海军做梦也想不到,在东海岸、加勒比海、中美洲沿海一带活跃的XXI级潜艇根本不是他们预计的20余艘,而是将近30艘!
很快这个数字会上升到50艘,冰岛战役结束后,德军的战略重点将会转移,北大西洋方向承担任务的潜艇将会持续扩大,且全是最新锐的XXI级潜艇,邓尼茨会把八成以上的新锐潜艇都派往该地区——XXI级目前的建造速度是每个月12艘,随着陆军装备生产规模降低,预计从8月份开始将增加到16艘/月,其中23型要占四分之一的份额。
休伊特的估计没有错,他所遭遇的这艘潜艇正是才服役不久,在U艇部队中仅有2艘的23型潜艇。
这艘新锐的XXIII级潜艇原本已找准了攻击目标,但谨慎的船长发现自己处于庞大的船队中时,立即改变主意,依仗其快速的水下速度逃之夭夭,然后等待夜色降临之际将电报发给了在港口驻扎的克兰克,同时又发报给亚速尔上的指挥中心,准备调集狼群进行攻击。
在外围执勤的一艘美军弗莱彻级驱逐舰声呐兵依稀听到有不同寻常的声音,但等反应过来时,这声音已远去了,只能把疑似接触潜艇的消息告诉休伊特,然后后者原封不动地汇报了上去。
23型潜艇几乎是不可攻击的,因为驱逐舰必须依赖声呐定位才能有效投掷深水炸弹进行攻击,可23型速度又贼快,驱逐舰或者反潜舰想要跟上这个速度,声呐兵已无法区别本舰噪音和敌舰噪音,也就谈不上追踪攻击;如果放慢速度,马上又会让对手溜走,因此除非正好上浮时被水面舰艇逮个正着。但即便这样,也要两者间距离足够近才行。
美军曾用雷达在30公里外发现露出通气管充电的德国潜艇,等2艘驱逐舰气势汹汹杀到现场时,潜艇早已下潜并逃跑,不信邪的驱逐舰往他们认为可疑的地方丢光了所有刺猬弹,结果却一无所获。
这种让人明明知道有潜艇存在却无法命中的感觉实在太差了,21型潜艇如此,速度更快、隐身能力更强、噪音水平更低的23型潜艇就更加可怕。
在“大洋黑洞”面前,传统反潜已走到尽头……<();
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