Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/401

Rh A further trial with this model, repaired after damage, gave a value of $$\xi =$$ .025. The cause of this divergence was not ascertained.

Model No. 2. Series E. (Fig. 156).—Trials with this model gave the result $$\xi =$$ about .03. This value is probably too high. The weather was unfavourable, and the weight of the model (1.66 grams) proved too great for the method of construction; frequent repairs had to be made in the course of a single series of experiments.

Model No. 3. Series E. (Fig. 152), Construction.— Aeroplane and fins, varnished cedar. Tail planes, mica plates. Body, cedar, ballasted with lead.

Weight = 46.3 grams = .102 lbs.

Area—

Angle of aeroplane $$(\beta), = \tfrac{1}{20} .$$

Preliminary Trial, Aerodone launched by hand, 13 ft. 6 in. altitude.