Air Force Tests of Sperry Messenger Model with Six Sets of Wings (1928)
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increase in maximum lift for the runs at 20 atmospheres. In Figures 12 to 19 lift coefficient, drag coefficient, and lift-drag ratio are plotted against the angles of attack measured in the tunnel. As explained above the corresponding angles for free air will be found in the tables. These figures… … Fig.20—Curves of power required by Sperry Messenger airplane. Tests at 20 atmospheres The curves of power required are plotted against speed in miles per hour in Figure 20. The tests at 20 atmospheres, corrected for tunnel wall, were used in computing this data. On account of the large difference…
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