Anchor-projectile . An anchor-projectile for mud was part of the 

 contractor's design, Figure 12. It is identical to the sand anchor- 

 projectile except for larger flukes which are 9' 5'' long. Its diameter 

 when the flukes are in the folded position for embedment is 36 inches, 

 and its total weight is 3680 pounds. 



The original coral anchor-projectile was smaller than the one 

 described, had smooth edges and utilized a bridle arrangement for the 

 down-haul cable, Figure 13. The larger coral anchor-projectile with 

 serrations on its edges and with a swivel connection evolved during 

 testing. For use in rock the coral anchor-projectile was tapered more 

 at the tip accentuating the arrowhead shape, Figure 6. 



Ordnance System . The original ordnance system used explosive 

 bolts to release the beach gear leg line from the launch vehicle. 

 Long explosive MDF leads between the S/A device and the bolts were 

 required. The bolts proved unreliable and extremely awkward to install 

 and protect, so they were replaced by the mechanical release device. 



The safe and arm device was modified by removing the solenoid used 

 for locking the in-line/out-of-line slide, by removing the attitude 

 indicator, and by potting the electric circuit chamber with room 

 temperature vulcanizing rubber (RTV) . Potting the electric circuit 

 chamber was necessary to prevent leakage through the radio frequency 

 gasket (RF) used to seal the chamber. These gaskets evidently 

 deteriorated on the shelf for they had passed hydraulic pressure tests 

 prior to delivery to the government. 



Cables and Connections . The down-haul and bridle cables were 

 increased in size from 1-1/4 inches to 1-1/2 inches. The pins that 

 connect the down-haul cables to the bridle cables were changed from 

 standard pins to safety pins with a nut and bolt keeper. An equalizing 

 thimble was installed in the bridle in place of a "spider plate" to 

 assure that loads on the two legs of the bridle are about equal 

 regardless of direction of pull. 



Launch Vehicle Hull Section . The hull sections were strengthened 

 by adding stiff ener bulkheads, perimeter ribs, and a bottom support 

 frame. Also, pressure relief holes were added. Doubler plates were 

 installed at each structure joint as the hull sections were joined 

 together during assembly. 



TEST PROGRAMS 



Operations and Procedures 



Similar facilities and procedures were used for both the contractor 

 and NCEL testing programs. Exact procedures varied with test objectives 

 and the support equipment available. In general, the anchor assembly 

 was prepared on deck for firing. It was then lifted over the side, 

 lowered to the seafloor and fired. The launch vehicle then was brought 

 back onboard and the vessel being used as a work platform was moved 

 into position to apply test loads to the anchor-projectile. 



