Page 124 - Theory and Design of Air Cushion Craft

108 Steady drag forces

0.4 -

0.2 -

0.2 0.4 0.6 0.8 h eqlh c

Fig. 3.23 Equivalent leakage /? eq compared to the distance from seal lower edge to the cushion inner water
surface.

1.0
0.8
0.6
0.4
0.2
0
0.8 1.2 2.0 Fr,=v-fgl c
-0.2
-0.4

Fig. 3.24 Correction coefficient for sidewall wetted surface area.

From equations (3.27) and (3.28) the area of wetted surface at any given Fr\, can be
interpolated from
at Fr { = 0, S ( = S m (max. area of wetted surface)

at Fr { = °° S f = S fx (min. area of wetted surface)
and