Quote:
Originally Posted by stephenf555
So, I guess I'm wondering is why it took so long for them to design a hydrodynamic sub? Was it an engine issue...that only then did they get appropriate electric motors and batteries capable of spending longer times under water?
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I can't say for certain, but I would bet that you have the answer right there. Prior to that time the so-called submarine was considered more of a submersible - a surface ship that could attack from underwater. The hull itself had to be shaped for effecient surface travel, and submerged performance was considered secondary until proper propulsion could be divised.
Also, the "historical" thread is more aimed at US boats, as that is the OP's area of expertise. While I'm tempted to point out the dedicated Atlantic U-boat forum for SH4, you're fine with it right here.