During the tests on the whirling-table this type of construction seemed to be exceedingly strong and stiff, and to be easily maintained in whatever position it was placed. It was therefore thought that it would prove strong enough for the aerodrome, and it was accordingly inverted and given a “sanding test” [p192] by sprinkling sand uniformly over it to such a thickness as to cause it to have a load of 0.75 pounds per square foot. As it showed no serious deflection or change of form under the sanding test, it was decided that it was strong enough for use in tests of the model aerodromes in actual flight. Upon the completion of these whirling-table tests, the cloth covering of this wing was painted with collodion varnish, which increased the weight of the wing only 50 grammes. In order to make the results of its tests more easily comparable with those obtained before varnishing, the cross guy-wires on the wing were changed to a slightly smaller size in order to make the weight of the wing the same as before. It was tested on March 3, and the following results were obtained: Weight of wing = 1025 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 wing = 1175 grammes = 2.585 pounds; area of wing = 21.85 square feet; equivalent load on wing = .1183 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.) 5.0° 10.5 1060 17.7 250 5.0° 10.5 1060 17.7 250 10.0° 8.5 859 14.3 250 10.0° 8.5 859 14.3 250 Angle Drift Foot-pounds Calculated of (pounds). per sec. soaring speed chord. RV. carrying 0.5 pounds per sq. ft. (ft. per sec.). 5.0° 0.55 9.75 36.37 5.0° 0.55 9.75 36.37 10.0° 0.55 7.88 29.4 10.0° 0.55 7.88 29.4 Although the varnishing of the wing seemed to have no effect on the “drift,” the soaring speed was slightly decreased.