Supporting Sha 



Direction of Motion , 

 6" When Towed 



Figure 2 - Sketch of l/3-Scdle Model of Buoy 1 



supporting Shaft — " 



6" Direction oT Motion 

 When Towed 



■Towing Bail 



Figure 3 - Sketch of l/3-Scale Model of Buoy 2 



Direction of Motion. 

 When Towed 



Supporting Shaf 



Towing Bail ■ 



Figure 4 - Sketch of l/3-Scale Model of Buoy 3 



The l/3-scale model of Buoy 3 is a short cylinder 6 inches in diam- 

 eter with a disk 7 3/8 inches in diameter fastened on Jthe forward end. The 

 direction of motion on towing was along the axis of the cylinder. This 

 model is shown in Figure 4. 



The full-scale model of Buoy 1 is a 1 6-inch laminated wooden sphere 

 with a projecting ring 18 inches in outside diameter around the vertical 

 transverse equator. This sphere was mounted on one end of a 1 1 /2-inch rod 

 and four plastic fins were mounted at the other. These fins were 24 inches 



