The Douglas DC-7 and Lockheed Starliner were the Superprops of airliners. They used Wright Turbo Compound Engines which at first glance appear to be in violation of the laws of physics.

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Links:
Turbo vs Supercharging:    • Turbo vs Supercharging in WW2 Airplanes  

Spitfire exhaust:    • Supermarine Spitfire Exhaust  

TWA Flight Center and Lockheed Starliner / Constellation:    • TWA Flight Center and Lockheed Conste...  

WW2 Bomber Twin Tail design reasons:    • Avro Lancaster, Payload, Turrets, Sta...