A Survey of Ship Motion Stabilization 



Fin Number 4 



\ 



Fins separated by 1 ft. 



Upper surface of fin tangent to baseline. 



Fin Area: 640 sq ft. 



.^^" ^'^^ =0.023 



Waterplane Area 



Fin Number 4h 



Obtained from Fin Number 4, by drilling five 1-ft 

 diameter holes on each fin as indicated in sketch. 



Fin 3 — Same as Fin Number 1 with 30° dihedral angle. 



Fig. 26b - Views of anti-pitching fin 4 

 and description of anti-pitching fin 3 



1.6 



1.2 



0.8 



0.4 



0.10 0.20 



Froude Number, F„ 



0.30 O 



0.10 0.20 



Froude Number, F„ 



0.30 



Fig. 27a - Dimensionless pitch amplitudes 



779 



