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Originally Posted by Rockin Robbins
The bottom crank(?) is the radius of turn for the torpedo. This was one of the reasons given for the TDC overhaul in the book I read, that the electrical Mark 18s had a different speed and different turn radius. Now we know that the TDC could handle that anyway!
I have to locate the reference and determine who was so misinformed! Looks to me that they were just updating Mark III to Mark IV, most notably inserting the receiver module.
This just gets more and more interesting!  |
I don't know if they did do upgrades from Mark 3 to Mark 4. Pampanito (SS-383) which was built later than Cod (SS-224) still has a Mark 3. Icefish (SS-367) and Hawkbill (SS-366), which both went to the Netherlands after the war (after being Guppied) had Mark 3's. One of which is on display in the Dutch Navy museum in Den Helder.
Also, inserting the receiver was a major operation, which would include opening the pressure hull on the conning tower, making extra room for the receiver etc.
Would have been very expensive...
So, yes it is getting more interesting...
groetjes,