[aanker]

The info in the two graphs linked below reflect values in the pre-WW II submarines, however the TAMBOR class is also pre-WW II and is included in this data. As you know, diesel electric boats had two, then four diesel engines, plus the aux 'Hotel' engine.

Of course the electric engines powered the prop's.

HNSA sure has changed and much of their info is no longer available like the battery tables CCIP (and I) had seen before. These websites are disappearing fast (so grab what is of interest when you find it)... however I was able to find info on HyperWar that may be of interest regarding battery's:

HyperWar:
Current Doctrine Submarines
https://www.ibiblio.org/hyperwar/USN...oct/index.html
https://www.ibiblio.org/hyperwar/USN...SS-Doct-1.html

Plates:
Page 5
Maximum Time Submerged and Cruising Range vs. Submerged Speed Knots
Figure 1
https://www.ibiblio.org/hyperwar/USN...SS-Doct-p5.jpg

Page 7
Submerged Speed Percent of One Hour Rate
Figure 2
https://www.ibiblio.org/hyperwar/USN...SS-Doct-p7.jpg

Also may be of interest:

"1125. Submarines may be expected to submerge in less than 60 seconds."!!!
I don't think they could go on patrol unless they could submerge in less than 60 seconds. This is not an issue in FOTRSU but I had made that statement many times.

I'll go back to re-reading Silent Victory now : )

Happy Hunting!