Page:Aerial Flight - Volume 2 - Aerodonetics - Frederick Lanchester - 1908.djvu/397

Rh of the curves (where they overlap) as shown. In the example given the calculation is as follows:—

Suspension from origin O1 gives t1 = .29.

Now, $$\lambda^2 = l\left ( g\left ( \frac{t}{\pi} \right )^2 - l \right )$$, from which it is evident that A falls to zero when $$l_1 = o$$ (i.e., at origin), and when $$l_1 = g\left (\frac{t_1}{\pi}\right )^2$$ that is

Suspension from $$O_2, t = \cdot 36$$

These values give l1 and l2 respectively for $$\lambda^2$$ = o laid off from O1 and O2. The intersection evidently lies between these points. We proceed to plot this portion of each curve as follows:—

And similarly for the curve of $$l_2$$. The ordinates representing these plottings are shown in the figure.