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Aviation History
1912
1912 - 0403.PDF
MAY 4. 1912. 1/ycHT wing-camber in causing a deflection in the air stratum. When the radial distance of the curve from the plane is considerable, then the air stratum is being rapidly accelerated ; when the distance is less, then the air stratum is not undergoing such a rapid change, and if it be found that the camber and attitude of the plane ought to have maintained the initial deflection, then any such falling off in pressure would be an indication that the camber is less effective at one part than another of the wing section. In general, it will be observed that the trailing |H>rtion of the wing section is less eriective than the leading portion. By carefully comparing the pressure distribution curves with the cambers of the wings that produce them, Mi. Handley Page has lioen able to make some very interesting analyses, one of which is virtually what has just been stated, viz. : that if any of the sections were to lie recon structed so as to conform to the apparent air flow it would invariably have an exaggerated dipping front edge and a decreased angle of trail. In this connection it is interesting to observe that the very principle of the cyclic up-current, on which the dippingfront edge is DRl FT&PIJLL Charts prepared from GRAPHIC ANALYSIS of PRESSURE DISTRIBUTION DIAGRAM GRAPHIC ANALYSIS of PRESSURE DISTRIBUTION DIAGRAM —s Mr. Handley Page's analysis of Eiffel's pressure-distributicn curves, showing the drift or pull (due to the slope of the pressure ordinates away from the vertical) at each point along the chord from entry to trail. Top and bottom surface effects are shown separately, and five different positions along the semi-span are compared. The diagram in the top right-hand corner shows the graphic analysis of a pressure-distribution curve from which the drift and pull ordinates are obtained to build up the charts. 403
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