Anchor-Projectiles 



There are two anchor-projectiles, one for use in coral and the 

 other for use in sand and mud. The coral anchor-projectile, Figure 5, 

 is a welded, three-fin configuration fabricated from steel. Along 

 the outer edge of each fin are serrations about 2 inches deep and 6 

 inches long. The anchor-projectile is 6 feet long, the edge-to-edge 

 distance is 37 inches, and it weighs about 2000 pounds with the piston 

 which weighs about 500 pounds. 



The sand anchor-projectile for sand and mud, Figures 9 and 10, is 

 constructed of steel and consists of a center shaft and three extensible 

 flukes. The center shift has three ribs welded to it. Each fluke 

 also has a notched rib, Figure 10. The notches mesh and take much of 

 the force due to acceleration. The flukes are in the closed position as 

 the anchor-projectile is propelled into the seafloor. Once embedded 

 and a load is applied, the flukes extend outward to increase the 

 holding capacity of the anchor. The flukes are 5' 6" long, the anchor- 

 projectile assembled for installation has a diameter of 28 inches, and 

 it weighs about 2500 pounds with the piston. 



Ordnance System 



The ordnance system includes a safe and arm (S/A) device, a 

 touchdown delay firing mechanism and a cartridge assembly. The S/A 

 device initiates the fire train to the cartridge assembly via mild 

 detonating fuze (MDF) leads. Schematics of this arrangement are 

 shown in Figure 8. 



The S/A device, Figure 11, contains a pressure-operated in-line/ 

 out-of-line slide with electric detonators. The touchdown delay 

 mechanism is activated at the moment the launch vehicle touches the 

 seafloor. After a two-minute delay (this time can be made greater or 

 less) it sends an electric impulse to the S/A device which fires the 

 cartridge via the MDF leads. The delay device recycles if lifted and 

 touched down again. 



Miscellaneous Features 



An attitude indicator is mounted on the launch vehicle, Figure 8. 

 It emits a signal that is picked up on the ship's depth recorder if 

 the launch vehicle is at an angle greater than 30 degrees. A piston 

 lift and a piston keeper are used to help in inserting the piston 

 in the gun barrel. Detachable ladders are used to help in installing 

 the ordnance features. 



Modifications 



The design tested by the government reflects several significant 

 changes from the original design produced by the contractor. 



