A patrol technique that works for me is to run submerged for 6 hours at slow speed (2-3kts), surface and charge batteries, which takes about 1 hour, run submerged for another 6 hours and repeat. By doing this I rarely run into a airplane or surface ship while surfaced, and my batteries are always over 50%.
__________________
"Some ships are designed to sink...others require our assistance." Nathan Zelk
|