Patent SU-640652-A3 (SU)
Inventor: BARTOE OTTO EDWIN JR
IPC: B64C3/58
Filed: 1975-07-14
Granted: 1978-12-30
Abstract: A powered air foil structure particularly adapted for use during low speed operation associated with take off and landing of an air craft and an air foil therefor. The air foil comprises an upper surface including first and second portions, the trailing edge of said first portion being vertically spaced above the leading edge of said second portion by an amount equal to approximately 0.03 to 0.20 times the chord of said air foil, the trailing edge of said first portion being disposed rearwardly from the leading edge of said air foil by an amount equal to approximately 0.20 to 0.33 times the chord of said air foil, said spaced apart trailing edge of said first portion and the leading edge of said second portion forming a nozzle for directing gas rearwardly of said air foil and across substantially the entire upper surface of the air foil disposed rearwardly of said nozzle, said nozzle extending in a generally spanwise direction of said air foil, and means for supplying pressurized gas to said nozzle. One shown air foil structure includes said air foil in combination with an augmentor air foil which is disposed rearwardly of the trailing edge of the first portion of said air foil and vertically spaced thereabove for the purpose of entrapping or incorporating ambient air within the gas exiting from said nozzle. The air foil structure may also include said air foil having a flap extending spanwise adjacent the trailing edge thereof and a deflector air foil for directing at least a portion of the ambient air-gas mixture across the upper surface of said flap and downwardly of the trailing edge thereof. The method of this invention involves the steps of directing gas rearwardly of said air foil from a spanwise extending nozzle disposed along a line located rearwardly from the leading edge of said air foil by an amount equal to approximately 0.20 to 0.33 times the chord of said air foil and having an opening the height of which is equal to approximately 0.03 to 0.20 times the chord of said air foil wherein said gas is directed across substantially the entire upper surface of the air foil disposed rearwardly of said spanwise extending nozzle, entrapping ambient air within the gas directed rearwardly of said nozzle and across the upper surface of said air foil downstream of said spanwise extending nozzle and directing at least a portion of said ambient air-gas mixture across the upper surface of said flap and downwardly of the trailing edge thereof. The method of this invention also comprises pressurizing a gas, supplying said pressurized gas to the interior of said air foil, and directing gas rearwardly of said air foil from a spanwise extending nozzle disposed along a line located rearwardly from the leading edge of said air foil by an amount equal to approximately 0.20 to 0.33 times the chord of said air foil and having an opening the height of which is equal to approximately 0.03 to 0.20 times the chord of said air foil wherein said gas is directed across substantially the entire upper surface of the air foil disposed rearwardly of said nozzle.