U.S. Patent Specifications Available to Purchase

In an aircraft the combination with an engine and a propeller of streamlining devices comprising a streamlined spinner section rotatably mounted on the engine shaft forward of the propeller, means to inhibit rotation of said spinner with the shaft, a streamlined section movable with the propeller and constituting a continuation of the streamlining of the spinner section, a streamlined fixed section secured to the engine and constituting a continuation of the spinner and rotatable streamlined section and a cowling surrounding and secured to the engine and formed to provide a narrow air inlet slot between said cowling and the fixed section to admit a limited flow of air about the engine and outlets for the exit of said air, said cowling including outlets for the exit of substantially all the air entering said inlet slot.