Page:Aerial Flight - Volume 2 - Aerodonetics - Frederick Lanchester - 1908.djvu/390



Curve No. 1 is the special case of the straight flight path.

Curves Nos. 2 and 3 are plotted by the approximate method of § 31.

Curve No. 4. (Inflected type.)

For highest and lowest points on the curve, cos θ1 = 1, and

For highest and lowest points on the curve, $$\cos \Theta_1 = 1$$, and

the solution of which gives alternative values of II (compare § 28).

H = 25, highest point of curve (already known).

H = 113.5, lowest point on curve (value required).

Point of Inflection.—This is given by § 28, Equation (15).