23 



Figure 20a - Drag under Load Imposed by 50-Pound Weight Towed from Forward Towpoint 

 Average drag, 27.90 pounds; Towing speed, 10.02 knots; Frequency, 1.H cycles per second. 



£1 



0.22 pound 



Figure 20b - Drag under Load Imposed hy 50-Pound Weight Towed from After Towpoint 

 Average drag, 31.90 pounds; Towing speed, 9.99 knots; Frequency, 1.34, cycles per second. 



Figure 20o - Drag <under Load Imposed by 75-Pound Weight Towed from Forward Towpoint 

 Average drag, 34-.50 pounds; Towing speed, 9.98 knots; frequency, 1.28 cycles per second. 



Figure 20d - Drag under Load Imposed by 75-Ppund Weight Towed from After Towpoint 

 Average drag, 44.35 pounds; Towing speed, 7.48 knots; Frequency, 0.95 cycles per second. 



Figure 20e - Drag under Load Imposed by 75 -Pound Weight Towed from After Towpoint 

 Average drag, 45.70 pounds; Towing speed, 8.00 knots; Frequency, 0.94 cycles per second. 



Figure 20f - Drag under Load Imposed by 75 -Pound Weight Towed from After Towpoint 

 Average drag, 46.15 pounds; Towing speed, 8.50 knots; Frequency, 0.96 cycles per second. 



Figure 20 



Examples of Cyclical Variation in Drag of the TMB Planing Float 

 under Certain Load and Speed Conditions 



