Miles=1
Knots=45
Actual distance 63 miles
Recharge time 6 hours
That's as close as I can get to reality for the Sargo right now, about 22 hours at 3 knots, about 63 miles range before battery down to 10%. The game apparently doesn't factor in number of engines on charge, because stopped dead for six hours (drifting with all 4 engines on charge) or cruising ahead standard for six hours makes no difference to the recharge time.
I can't remember where I saw what numbers, but it was something like 1 hour charge = 4 hours (or maybe it was six) submerged at slow speed. That may have been for the type VII U-boat, data on the Gato I read indicates 36 hours at 2 1/2 knots rather than 48 hours at 2 knots (IIRC that was the figure for the type VII) but the difference is only six miles, 90 miles for US fleet boat versus 96 miles for Das Boot. Don't really matter since whatever I do I can't get near 90 miles or 36 hours at present.
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