Heres the scenario.
It takes about 3 hours to recharge bats. Fuel and battery consumption is based on how many RPMs your turnining. Less RPMS, less engery used, more RPMs, more energy being used. Hydrodynamics is not modleed so thats all we need to know. So again, 3 hours of recharging.
Thats 3 hours of
A.) sitting stationary with one engine at 500 RPMs (flank).
something which i'd rarely do unless in a good chokepoint of a grid, or
B.) running at one engine at 500 RPMs and another engine at 100 to 200 RPMs, for a grand total of 600 to 700 RPMs.
vs
12 to 24 hours of both engines running for a combined total of 200 to 400 RPMs during that time.
The key is knowing how much fuel is burnt off at any given RPM setting 100 through 500, which, i dont think anyone really knows. But, the proof is in the doing. I proved it to myself doing a patrol to GR89. Clear out by the cape of africa. I did that in an IXC, running submerged the entire time, raising a snorkel only long enough to recharge the batts 3 hours a day. If i did that trip on the surface, i would have ran out of fuel somewhere in the vacinity of Gibralter or spain. Instead i ended up bringing my boat into Lorient, with a few drops to spare, but she was most definatly sucking diesal fumes by that time.
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