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Woop, found some info. They are more properly known as power recovery turbines. The 18 cylinder Wright_R-3350 used 3 of them (one on each cylinder row exhust) them to increase power by 20ish%. Unfortunately: "This is not without cost, however, for those devices are also nicknamed "Parts Recovery Turbines" (and worse) and were another source of failures."
They also use fluid couplings (like an auto transmission) to transfer energy to the crank.
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