In no single test did all of the components function as a complete 

 system. However, each component performed separately as intended, at 

 least once. Most of the problems concerned the explosive anchors. 

 For example, the contractor-procured anchors were found to be improperly 

 heat-treated, and they failed under high acceleration induced stress. 

 This fault was corrected after two tests. Recoil of the anchor gun 

 assembly was restricted by the tripod framework and caused high stresses 

 in the anchor and the framework. Problems were encountered with the 

 cable-payout system. The cable bale had to provide a sufficient amount 

 of cable for the anchor, whose depth of penetration varied for each 

 shot, and a means had to be provided for the rewind mechanism to draw 

 off the remaining cable and develop a pretension in the line. A new 

 frame was designed specifically to accommodate a workable cable-payout 

 system. The redesigned structure then performed according to design. 



The activator unit initially malfunctioned due to an intermittently 

 operating transistor. After the trouble was remedied, the unit 

 functioned according to design. The battery power source initially was 

 used without a protective container (heavy grease provided insulation 

 from sea water) and was subject to deterioration. Later a battery 

 container filled with transformer oil and covered with a flexible 

 neoprene top to make the system pressure compensated was used and 

 prevented deterioration of the batteries. The specially designed 

 stern roller was not used in tests with the PADLOCK. However, it was 

 used in other deep sea operations where conditions were similar to 

 those to be experienced with the PADLOCK in deep water. The roller 

 was found to adequately handle synthetic rope, wire cable, chain, and 

 shackle connectors made up as a single string. It also mentioned the 

 line load at all times and provided an outboard means of preventing 

 a vertical line from chafing the vessel's bumper plate. 



The report, (Dantz , 1968, p. 19), concluded that: 



1. "In general, the PADLOCK Anchor System has been demonstrated 

 to be a workable concept. 



2. "The power supply, rewind mechanism, and cable system are 

 workable and fully dependable. 



3. "The activator unit is operational, water tight at pressures 

 up to 500 psi (no upper limit established), and is not affected by the 

 shock loads imposed by the detonation of the embedment anchors. 



4. "According to a limited number of tests, the reliability of 

 all the components functioning as a complete system is very low, 

 mainly because the reliability of the embedment anchors was 

 unsatisfactory. " 



It was recommended that further effort be suspended until the reliability 

 of propellant-actuated embedment anchors was improved. 



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