A casual assumption that if a type of U-boat was cancelled it must still have been an entirely worthy project and one easily resurrected in short order even after years had passed. Unlike, of course, the other EIGHTEEN classes of U-boats considered by the Kriegsmarine and rejected during the war.
Apparent ignorance that there are no Type XI subs in existance to use as a test bed.
The assumption that this entire weapon system concept, once it is properly designed and produced and test, can be easily and quickly converted from an entirely theoretical submarine with a displacement of 4500 tons to the Type IX submarine displacing barely one fifth that total. After which the Type IX submarines will be somehow converted into Type X subs which displaced 1700 tons.
So the entire concept depends on a purely theoretical weapons design which the Kriegsmarine never felt any need to produce somehow being designed and produced and properly tested and then successfully transferred from something the size of a light cruiser to something the size of a small destroyer. In a matter of a months.
AGH! No, I forgot the type X was already used. I was simply calling this conversion the type X because it was the middle ground between the Type IX and the Type XI.
5" inch guns of this type have been used on German warships; the difficulty would be making it so that it is water-tight, and fitting it in the ship. I agreed with you, so what I designate the "Type XXVII" would have to undergo testing for at least a month to see if it is possible. If it is not, then the system as a whole is canned, and there is no raid. If it works, conversions are made on other Type IX submarines, allowing for the raid to continue. Also, we are talking about about one to two single gun turrets, not two twin gun turrets.
Edit: As Cal Bear just pointed out, the Gun Captain is going to have a hell of a time trying to mark his targets, not being able to see. Therefore, there must be something similar to an optical periscope on the top of the gun for the idea to work (which would not have to break), maybe something similar to how tanks are able to sight their targets. If it is open, however, then there will need to be hatches capable of covering the elevator system and to cut if off from the U-boat (which should be the case anyway if the turret should ever be damaged).
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