Figure 20. Curves for estimating performance.

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.