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

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—

	Aeroplane	44
	Tail plane	13
	Fins	12.4
	Body	3.25
		———
		72.65 sq. in. = .504 sq. ft.

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

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

Flight Data.^[1]

	Distance. Ft.	Time. Secs.	Velocity. Ft./Sec.
1 2 3 4 5	39 42 40 42 42	1.4 1.2 1.4 1.2 1.2	28 35 28 35 35
Mean	5) 205	6.4	161
	41	1.3	32

1. Flights of curved or irregular path, were not recorded. Time taken with stop watch reading to .2 second.

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