U.S. Patent Specifications
Aircraft Engineering and Aerospace Technology
Article publication date: 1 February 1944
In an aircraft having an engine and formed in an exterior wall with an elongated opening, an air scoop including a wall section overlying and spaced from the opening in the aircraft wall, said air scoop wall converging relative to the aircraft wall and denning an air inlet at its larger end and a restricted outlet at its smaller end, the inlet end of the air scoop being open to the admission of air under a pressure incident to the travel of the aircraft, and a filter arranged in the opening in the wall of the aircraft and open at one side to the air entering the air scoop and delivering filtered air from the opposite side for use by the engine, the relation of the filter and air scoop causing the air to be delivered through the filter to be at a pressure less than that of the air passing through the scoop, the filter being so constructed that its effective filter length is materially greater than the length of the filter‐receiving opening in the wall of the aircraft.
(1944), "U.S. Patent Specifications", Aircraft Engineering and Aerospace Technology, Vol. 16 No. 2, pp. 61-62. https://doi.org/10.1108/eb031099
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