-4- 



Model Full-Scale 



4024 Revised G-60 sled-type 



4025 All-steel sled-type 



4026 BuShlps design "A", boat-type 



4027 BuShips design "B" , boat- type 

 4029 TMB design 



Model and full-scale relationships are given in Table 1. 

 The model of the revised sled-type target was con- 

 structed of pine and the other models were made of balsa wood 

 in order to keep the total weights within the limits specified. 

 The models were all constructed to a scale of 1/15 full-size. 

 All models were four feet long* Simulated target screens 

 were installed on the models for the Potomac &iver tests „ 

 Pitting room pictures of the models as tested are shown in Figure 

 21. 



TEST APPARATUS AM) PROCEDURE 



The test and analysis program was divided into four 

 parts o Part 1 of the program consisted of towing the models by 

 cable in the model basin to determine the comparative resistance 

 characteristics o A 1/32-inch diameter steel cable 400 feet long 

 was used for towing the models Each model was tested at two 

 initial displacements and at a series of initial trims, positions 

 of towpoint, and speeds, except the TMB design which was towed 

 with a single cable attachment in place of the conventional 



