1.2 r 



1.1 



1.0 

 .9 

 .8 - 

 .7 - 



a = 36.9° 



J 



20 



60 



180 



220 



100 140 

 ARC RADIUS, R (Feet) 



Figure 18. — Safety factors vs. avo radius } R, for conditions given in figure 17. 



.6 1 ' " 1 1 1 1 1— — i i i ■ ■ 



25 27 29 31 33 35 37 



CHORD ANGLE, a (Degrees) 



Figure 19.— Safety factors vs. arc chord angle } a, for conditions given in figure 17. 



21 



