324 P. Mandel 
2.6 GF 
4 Narrow : Bilge Keels 
( 
2.2 GY Approximate range of 
roll and sway excitation 
periods 
91/2 "MAX. MODEL WIDTH 
G 
2.0 | Z 
VY 
w 
= 1.8 
fo) 
1S) 
® 
a 7&10 
o 1.6 
<2 
a 4 3 
1.4 
3) 
1.2 © 
Oe S 
T 92 a 
Ke) he) 
Numbers of circles correspond to 7/2/7-29 test numbers. Vy 
Location of circles correspond to experimentally determined 4) 
08 ascent velocity and computed natural period of roll oscillation. mW, 
Smallest angle between lines in circles corresponds to observed 
maximum amplitude of roll. 
0.6 
O 0.5 1.0 1.5 2.0 2.5 3.0 B.S) 4.0 
Ascent Velocity, Ft./Sec. 
Fig. 10. Model oscillation data, experimental and computed 
PREDICTION OF FULL-SCALE DATA 
While the model results are of great importance in confirming design philosophy, they 
cannot be applied directly to predicting full-scale performance. Examination of Fig. 5 shows 
that both the nondimensional drag and roll excitation period change radically between the 
model range and the full scale. However, with the assumption that the limited experimental 
data modestly confirm design calculations within the model range, one can utilize the full- 
scale data in Fig. 5 with more confidence. 
