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It's been done The Wright R3350 aircraft engine was eventually fitted with three Power Recovery Turbines, which recovered energy from the exhaust gases that was then coupled back to the main drive shaft Wright R3350 DuplexCyclone WikipediaThe turbine is usually mechanically connected to the crankshaft, as on the Wright R3350 DuplexCyclone, but electric and hydraulic power recovery systems have been investigated as well The XC69 however, was equipped with four Pratt & Whitney R2800 radial engines instead of the Wright R3350s used on production models (Lockheed had made that installation on the prototype to test the R Re 4000 HP Wright R3350 DuplexCyclone breathing fire The JUMO design office was working on a wide range of projects between the 1930s and 1945 The 5 and the 7 were diesels, the 210 and 211 were robust petrol engines The 213 was a Jstor Org R 3350 power recovery turbine