a. During the first phase of all of the field tests 

 and some of the FY-71 laboratory tests, the, 

 upward line force on the objects was increased 

 gradually until either breakout occurred or a 

 predetermined value was reached. For the 

 remaining laboratory tests, the first phase 

 consisted of a more or less instantaneous 

 application of the predetermined line force. 



b. If breakout did not occur during the first 

 phase, a second phase was begun during 

 which the line force was maintained at a 

 constant value for an indefinite period of 

 time. Breakout usually occurred at some 

 point during this phase, with the length of 

 the time period varying between a few seconds 

 and several weeks. 



c. During a few of the field tests, there was 

 also a third phase (after the waiting period 

 of the second phase), which involved a fur- 

 ther increase in line force to the point of 

 breakout. This was done whenever it 

 appeared that the test would otherwise 

 extend into the night. 



To develop an analysis of these data, it is necessary to reduce the 

 number of pertinent variables to a minimum. This can be done by describing 

 the load application portion of each test by two quantities, a breakout force 

 and a breakout time. In this report, the breakout line force, F^^,, will be taken 

 as that line force applied at the end of the first phase of loading (or throughout 

 the second phase for those tests which continue into the second phase). The 

 breakout time, t^^, will be taken as the length of the second (constant line 

 force) phase of loading plus one-half of the length of the first (variable line 

 force) phase during which the line force exceeds the buoyant weight of the 

 object. 



The third phase of loading will be ignored because the results of tests 

 which included a third phase would be too complicated to analyze otherwise. 

 Instead, those tests with a third phase will be considered as tests in which break- 

 out did not occur under a line force, Fg^,, applied for a period, t^^, as defined 

 above. 



