Weight of wing = 420 grammes; weight of guy-posts, etc., = 320 grammes; equivalent weight of guy-posts, etc., = 150 grammes applied on the wing. Therefore, total load on wing = 570 grammes. Area of wing = 11.2 square feet; equivalent load on wing = 0.112 pounds per square foot. Angle Revolutions Velocity of Velocity Drift of of turn- center (ft. per (grammes). chord. table. of wing second). (ft. per min.) 2.0° 11.6 1195 19.9 210 3.0° 9.75 1005 16.7 157 5.0° 8.25 850 14.2 133 10.0° 6.75 695 11.6 129 12.5° 6.0 618 10.3 129 Angle Drift Foot-pounds Calculated of (pounds). per sec. soaring speed chord. RV. carrying 0.5 pounds per sq. ft. (ft. per sec.). 2.0° 0.462 9.2 42.1 3.0° 0.345 5.77 35.3 5.0° 0.293 4.16 30.0 10.0° 0.284 3.29 24.5 12.5° 0.284 2.92 21.8 In this test it is to be noted that the “drift,” or resistance, while considerably greater at soaring speed for 2 degrees than for 5 degrees, remains practically the same between 5 degrees and 12-1/2 degrees. Comparing it with the preceding test with the superposed wing, it is seen that at soaring speed at an angle of 10 degrees, the single-tier wing having a load of 0.112 pounds per [p191] square foot, has only 129 grammes drift, while the superposed one, while supporting 0.125 pounds per square foot, has 255 grammes drift. Moreover, the soaring speed of the single-tier wing is only 11.6 feet per second, while the superposed one requires a speed of 13 feet per second. As the superposed wing tested on November 30 was so weak structurally that it could not be made to keep its proper shape without adding an excessive number of guy-wires, it was decided that it was not adapted for use on the aerodrome, but before abandoning it the partitions and strips were added and it was again tested on the whirling-table on March 1, 1899, with the following results: Weight of wing = 905 grammes; weight of guy-posts, etc., = 320 grammes; equivalent weight of guy-posts, etc., = 150 grammes applied at ‹CP› of the wing; equivalent load on the wing = 1055 grammes = 2.321 pounds; area of wing = 21.85 square feet; equivalent load on wing = 0.1062 pounds per square foot.