Well, after three years I got the following underwater ranges sailing Balao-class sub at periscope depth:
- stock SH4 game: 70 km/38 nm/43,5 mi at 4 kt (99% to 10% drop of battery power)
- RFB 2.0 mod: 90 km/48 nm/56 mi at 4 kt (97% to 19% drop of battery power)
I guess Balao-class sub's realistic range should be 133,6 km/72,2 nm/84 mi at 4 kts according to data presented in this thread...
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