NAVWEPS OO-BOT-80 
STABILITY AND CONTROL 
IST MODE OR PHUGOID 
ANGLE OF ATTACK AT EACH 
INS%; ,,“L&blSG$~,lGH~ & 
5 LoNG PERIOD ------I kw a0 f 2 - 
g: *a 
2 0 
2ND MODE OR SHORT PERIOD OSCILLATION 
MOTION OCCURS AT ESSENTIALLY CONSTANT SPEED 
L TIME TO DAMP TO 
HALF AMPLITUDE 
Lb-- TIME 
/ 
/ 
-6.HORT PERIOD - 
UNSTABLE OSCILLATION 
Figure 4.20. Longiitudinal Dynamic Sttxbility 
280