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...the Wright R-3350's on our Lockheed Constellation EC-121's used 3 each "power-recovery turbines" (PRT's) that recovered energy from the exhaust from 6 cylinders (3 x 6 = 18 cylinders), to boost total horsepower from 2900 hp up to 3400 hp...that's 500 hp just from exhaust gases at 2,900 engine rpm!
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