-10- 



tests the cable tended to rise on starboard turns and sink on 

 port turns due to the lay of the cable „ On port turns the 

 target tended to follow inside of the wake of the towing boat. 



During the maneuvering tests the boat-type and the 

 TMB-design models were deliberately capsized when towed with 

 both bridle and single cable attachments „ With the single cable 

 attachment the models always' righted themselves., with some 

 damage to the target screens , whereas , with the bridle attach- 

 ment, more often than not, the wire loop broke before the models 

 were righted „ The estimated full-scale righting forces with 

 the single cable attachment did not exceed the strength of the 

 1-inch cable used in full-scale tows „ In Part 1 it was shown 

 that when towed with a single cable Model 4027 and Model 4029, 

 the only models so tested, had less resistance then when towed 

 with a bridle attachment, see Figure 6„ 



The full-scale estimates of horizontal target drag 

 with simulated cable load, Figures 22 to 31, show that the two 

 boat-type targets and the TMB design have substantially less 

 drag than the sled-type targets „' The same figures show that 

 at high speeds and with long cable lengths the horizontal cable 

 tension is virtually the same for all targets at both displace- 

 ments, with the exception of the revised G-60 sled„ A compari- 

 son of the estimated maximum speed attainable with full-scale 

 cable lengths of 1500 and 2500 yards and a full-scale cable 

 tension of 60,000 pounds is given in Table 2» 



