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Originally Posted by tater
The sub is propelled by electric motors.
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I thought Gato and Balao class were direct-drives, with a generator coupler. I'm pretty sure electric motors weren't used yet. We've had a thread on this topic before on the SH3 side. All electrics didn't start showing up until the early 50's.
On direct drives, you control fuel flow for a given load. When they slapped on the gear coupling to recharge the batteries, you'd be using the same amount of fuel for a slower shaft RPM. This is accurately recreated in the simulation -- your 1/3 and 2/3's speed is actually a fuel valve, and on pure propulsion loads, you're going to crank 12 knots. Throw on recharging, and you're doing 8-9 knots for 2/3's.
I've even noticed a 1kt difference between charging a battery at 10% and a battery at 80%, which would also be accurate.