The tail of the German Type 212 conventionally powered attack submarine has some more complicated structures behind its propeller. What is this thing? I'm "Uncle Encyclopedia" Uncle Rocket, let's find out today!
[The Mystery of Propeller Series]
Why the unmanned reconnaissance aircraft put the propeller on the tail
▶▶▶   • 无人侦察机为什么要把螺旋桨放在尾巴上，它的利弊是什么？【科学火箭叔】  
"Marine propeller" taller than three stories
▶▶▶   • 比三层楼还要高的“船用螺旋桨”，究竟是怎么造出来的？【科学火箭叔】  
There are propellers on the bomb
▶▶▶   • 炸弹上居然也有螺旋桨，可它们到底有什么用？【科学火箭叔】  
The secrets of the submarine are all written on the propeller, let us uncover it together!

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Through the description of natural science and social science knowledge, outline the overall outline of the scientific knowledge picture!
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