12 



Float Drag D = F - Dq 



Total Float Load L = W + Lq - F tan 



Figure 9 " Test Method for Determination of Characteristics 

 of TMB Planing Float 



[6] 



L = W + Lq - F tan/8 



where L is the total load on the float, 



W is the total weight of the float, and 



/8 is the angle of the float towline with the horizontal. 



Here again the fluid forces on the line for towing the system were neglected. 



RESULTS OF TESTS OF TMB PLANING FLOAT 

 UNDER VARIOUS LOADING CONDITIONS 



The series of tests discussed herein were conducted with a planing 

 float 4l inches in length designed for the catenary sweep. The complete di- 

 mensions of this float are given in Figure 4l , Appendix 3. The float was 

 tested alone at a constant load of 5^.9 pounds imposed by its own weight and 

 under eight conditions of variable loading, imposed in part by the faired 

 weights, Figure 8. 



The results of the tests are plotted in Figure 10 as curves of drag 

 in pounds against speed in knots for the various conditions of loading. Photo- 

 graphs of the float taken during these tests are shown in Figures 11 through 



19. 



From Figures 11, 12, and 13, it can be seen that the float did not 

 become submerged for the conditions of no load and of the load imposed by the 



