This is explicitly addressed in book 2, when Darcy launches the Deladier at higher than usual speed, and realizes afterwards that she has wasted energy bc air resistance is proportion to v^2 The up/down path is not energy free; ships are recharged on the moon (mentioned in bk 1) https://twitter.com/JASutherlandBks/status/1036977683803131904 …
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DIRECTOR'S CUT
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me too !
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