NSWC/WOL TR 77-90 



Table 1.1. Air Burst Test Parameters 



Explosive Weight* 8 lb 1000 lb 64,000 lb 



(3.63kg) (450 kg) (29,000 kg) 



Linear Scale Factor 1/20 1/4 1 



Height of Burst** 0.28 m 1.40 m 5.60 m 



* H-6 explosive, RDX/TNT/AL/WAX (45/29/21/5) . 



** Measured to point of initiation at center of charge. 



Section 2 outlines the method used for this analysis. 

 Section 3 gives the method and some of the details of the calcula- 

 tions. Sections 4 and 5 present the results and conclusion 

 of this study. 



2. METHOD 



The method followed in this study was to start from underwater 

 pressure-time signatures measured on 8-lb tests. Figure 2.1 shows 

 the complete set of pressure signatures measured on three identical 

 tests . 



Selected pressure signatures were scaled up to the 1000-lb 

 and 64,000-lb test configurations and were then used to calculate 

 kill-probablilites for particular sizes and species of swimbladder 

 fish. (Since the 8-lb tests were carried out in a small test pond, 

 fish-kill was not calculated for this scale.) 



The pressure signatures selected for kill-probability calcula- 

 tions were those at the greatest horizontal range from the charge 

 (see Figure 2.1), since these are the most important for estimating 

 the extent of the region of significant kill. We then compared 

 the calculated kill probabilities for the 1000-lb and the 64,000-lb 

 air burst tests with kill probabilities calculated for comparable 

 underwater explosion tests. 



2. Limited report by J. F. Pittman, Jan 1978; rej^arding DAWS POND Program II. 

 A replicate set from the closest-in string of gages which vas obtained on 

 the opposite side of the charge has been omitted from the figure. 



