U.S. Patent Specifications

In an aircraft having a wing, the combination with an enclosed engine chamber, an air‐cooled internal‐combustion engine in the chamber, a duct for heated air extending laterally from the chamber through the wing to an air‐outlet near the trailing edge of the wing, a duct for exhaust gases extending from the engine entirely within the heated‐air duct, a duct for cold air extending from an air‐intake at the leading edge of the wing to enter the engine chamber laterally and at least partly surround the heated‐air duct at the place where it enters the chamber, and partitioning means within the chamber to cause the cold air admitted through the cold air duct to flow over the engine first in one direction and then in the reverse direction to the heated air duct.