12 
O. H. Oakley 
ine) 
oO 
ip) 
fe) 
15 
MEAN OF ONE-HUNDREDTH HIGHEST VALUES 
MEAN OF ONE-THIRD HIGHEST VALUES 
ROOT-MEAN-SQUARE VALUES 
; 
ANGLE OF ATTACK DUE TO WAVE MOTION (DEG) 
) 
fo) 
20 30 40 50 60 70 80 
SHIP SPEED (KNOTS) 
Fig. 12. Variation of the wave induced angle of attack for a state 5 sea and 
a hydrofoil 5 feet below the surface 
(KNOTS) 
S00 
eo) 
30 
20 
SPEED OF INCIPIENT CAVITATION 
O | 2 3 4 5 6 7 8 9 10 
WAVE HEIGHT (FEET) 
Fig. 13. Degradation of cavitation-inception speed with increasing 
wave height for a thin foil submerged 6 feet and a wavelength of 
100 feet 
