Contents 



Page 



I. Introduction 1 



II. Design Goals and Considerations 1 



III. Moored Sweepline Technique 2 



IV. Design Details - Sweepline Array 2 



V. Determining Array Geometry - Catenary Analysis 3 



VI. Navigation and Positioning 11 



VII. The Recovery Operation 13 



VIII. Acoustic Release Failure Analysis 15 



IX. Conclusions 15 



X. Recommendations 16 



Figures 



Figure 1 - MAVA 17 



Figure 2 - Moored Sweepline Technique 18 



Figure 3 - Configuration of Towed Recovery Array 19 



Figure 4 - General Configuration of Sweepline Array 20 



Figure 5 - Anchor/Depressor Weight Rigging Detail 21 



Figure 6 - Sentinel Weight Rigging Detail 22 



Figure 7 - Pinger/Release Rigging Detail 23 



Figure 8 - Grapnel Rigging Detail 24 



Figure 9 - Recovery Array Geometry 25 



Figure 10 - Sweepline Geometry 25 



Figure 11 - Free Body Diagram at Sentinel 26 



Figure 12 - Array Geometry and Imaginary Segment 26 



Figure 13 - Geometry of Imaginary Segment 27 



Figure 14 - Extended Array Geometry 27 



Figure 15 - Catenary Detail - Case 1 28 



Figure 16 - Catenary Detail - Case 2 29 



Figure 17 - Transponder Net 30 



Figure 18 - Transponder Net Geographical Orientation 31 



Figure 19 - Electronic Equipment 32 



Figure 20 - MAVA Deflection vs Current 33 



Figure 21 - Plotting Sheet 34 



Figure 22 - Position Details 35 



Tables 



Table 1 - Fixed Constants 10 



Table 2 - Measurable and Calculatable Parameters 10 



Table 3 - Calculated Parameters 10 



m 



