The mooring was completed using two work boats lashed together 

 to install two 20K anchors. Once the ARS was in its moor, the moor- 

 ing lines were pretensioned. During use, one of the 10K anchors pulled 

 out during a moderate storm, with 25-to-30-knot beam winds, 4-to-5-foot 

 (1 .2-to-1 .5-m) seas, and strong beam currents, estimated to 2 knots. The 

 peak static load sustained by the anchor was estimated to be about 30,000 

 pounds (135 kN) ; ship surge would increase this load. The other 1 0K anchor 

 remained embedded throughout the operation and was left in place for 

 further use or testing. 



EVALUATION OF ANCHOR PERFORMANCE 



The land tests verified the efficiency of the anchor's propulsion 

 system and the structural design. The anchor is easily and quickly as- 

 sembled due to its light component weight. 



The firing system performed excellently; even at large angles of 

 tilt, the anchor fired each time. The safe-and-arm device is simple and 

 easily prepared for use and reuse. 



The downhaul cable packing arrangement tested at Point Mugu and 

 used at Midway proved to be ineffective. The wire rope tends to be kinked 

 by the acceleration it experiences as the anchor is fired. The urethane- 

 coated downhaul chain holds promise as a method of avoiding the abrasion 

 problems that are present when anchoring in sand. 



The soil flukes can be modified for use in coral; however, a sepa- 

 rate projectile designed for this purpose, similar to the CEL 20K rock 

 anchor,* would prove more effective, particularly in very hard coral 

 bottoms. The large 2 x 2-foot (61 x 61 -cm) fluke requires a slower low- 

 ering rate than the smaller 1 x 2-foot (31 x 61 -cm) fluke to prevent 

 tilting of the anchor system during descent and touchdown. Further 

 investigation of the anchor's hydrodynamics is warranted if a free- 

 fall mode is desired. 



SUMMARY 



The CEL 1 0K anchor is inexpensive to fabricate and simple to assem- 

 ble and handle. Preliminary results indicate that the firing system func- 

 tions reliably and that the gun system performance is predictable. 

 The scant data available from ocean testing indicate that the anchor 

 can satisfy its design capacity of at least 10 kips (45 kN) in coral; 

 capacities in excess of 30 kips (135 kN) are possible if the anchor is 

 satisfactorily embedded. 



The Magnavox S/A functioned simply and reliably during both land 

 and sea tests. The 10K anchor shows promise for providing the Navy with 

 another propellant-actuated anchor with medium range (10 to 50 kips, 45 

 to 225 kN) holding capability. However, further testing or actual use 

 will be required to provide the performance reliability data so necessary 

 for a system of this type. 



* Taylor, 1976, Op. cit. 



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