But if it's silent running you're after you click the silent running icon and that automatically drops your revs to 1/3. Which is 1 knot in a Balao. But you can up the revs to 2/3 without loss of invisibility, and that's 3 knots wich is a hell of a difference when you're evading vengeance.
It's all to do with keeping the revs below 100, which you can see if you do a walkaround round the dials.
Learned this from Rockin Robbins iirc, so blame him if this advice gets you sunk!
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