Using equation (1) to determine the necessary stroke,
pilot ejection catapults. Using the 15g curve of figure 20
instead of the equation would have yielded a similar
result. To use the curve, locate the intersection of the
desired final velocity (abscissa) with the curve
representing the allowable acceleration. The ordinate of
The actual stroke of the M5 catapult is 66 inches.
this intersection is the required stroke, which in the
c. The relationship of stroke and velocity for
example is 65 inches.
several values of acceleration also is shown graphically
21. Stroke Time. The time tm, required for a propellant
in figure 20. The performance curves were plotted
actuated device to complete its stroke may be estimated
using equation (1). The maximum acceleration curves
from the equation:
shown were chosen near those which are acceptable for
Figure 20. Curves for estimating performance.
25
