Page 164 - Theory and Design of Air Cushion Craft

Static transverse stability of SES on cushion 147

lo
0.11 a=40

0.09 W=13.7(x9.8kN)
1 CIB C=3.11
p c/l=\9.55
0.07 2=0.0079
z b=z s=0.\5m
fi,=0.12m
0.05
a=60°
0.03

0.01

2 4 6 8

Fig. 4.11 Influence of parameters a, /? on relative heeling righting arm.

T a

0.10
<z=45 c

0.08 a=50'
W=13.7(x9.8kN)
l c/B=3.11 5,=0.18m} a=55o
0.06 - B,=0.16mj
p tJl=l9.55
2=0.0079 ^,=0.18ml a=60°
0.04 B,=0.16mJ
£=65
0.02

2 4 6 8 10 en

Fig. 4.12 Influence of parameters a, ft on relative heeling righting arm.

2. Linearity in the relation of the righting arm with respect to the heeling angle only
exists at small heeling angles to about 3-4°, therefore it is convenient to take the
relative metacentric height h = h/B c, where h is the metacentric height and B c is the
cushion beam, as one of the stability criteria of the craft.
3. The width of the keel plate on the sidewall does not strongly affect the stability
either at small heeling angles or at large angles.
4. a strongly affects the stability at both small or large heeling angles.