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Originally Posted by Payoff
Does that battery travel pay dividends in the long run?
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In the long run yes it does. You have to run on the presumption of running your diesals as little as possible. That means surfacing/snorekeling at 0 hour, and diving at around 0500. Gives you around 4 to 5 hours to charge your batteries.
An example would be having to patrol grid GR89 near capetown in 1944. I was barely out of Lorient when I plotted the entire course round trip and arrived at the conclusion that i would be a bit short of fuel coming back. Simply put, not enough fuel, and no resupply. This also meant i had no fuel for any end around attacks, or any sort of pursuit. At that point i ran mostly submerged the entire trip. Turned out to be around a 130 day patrol, and i had enough fuel to return to lorient. The longer you stay submerged the more gains you'll make in fuel, but it takes awhle.