-14- 



APPENDIX 



Method of determining full-scale horizontal drag of 

 target with simulated cable load and full-scale horizontal drag 

 of target=plus-cable from model data. 



Dt = (D sec * T) cos*C 

 where Dt - full-scale horizontal drag of target-plus-cable, 

 in pounds 



D - full-scale horizontal drag of target with simu- 

 lated cable load, in pounds 



- angle between cable and horizontal at trailing 



end, in degrees Tan s A_ 



R m 

 T - cable tension, in pounds. T - PL 



<X = angle between cable and horizontal at forward 



. - w - \l w^ + 4 

 end, xn degrees. Cos* - ffe — 



• s applied cable load, in pounds 



R m - model resistance, in pounds 



2 



F : - tangential friction force in pound/feet = -—- „- 



~r- ~ arbitrary constant (for all sizes of cable) 



2 



P, . . „ . Ibo sec,, 

 - mass density of water, TTZ 



d = cable diameter, in feet 

 V = speed, in feet per second 



L - cable length, in feet 



W 

 w = g 



W = weight per unit length of cable in salt water, 



in pounds = 1.79 



R = drag of unit length of cable perpendicular to 



stream, in pounds - 50 P (for all sizes of cable) 



