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THE FORCE REQUIREMENTS
PERFORMANCE REQUIRED OF CONTROL SYSTEM
100 fathoms adjusting airfoils angle of attack attached boat buoyancy Bureau of Commercial calculate change depth component configuration control the depth controllable depth midwater depth control device depth control system depth midwater trawl depth sensor desired depth dip angle direction of motion DISCUSSION distance diving plane drag coefficient drag forces dynamic pressure equilibrium depth extra drag fish schools foot rope forces due forces necessary head rope horizontal lift hydrodynamic forces hydrofoil hydroplane illustrated in Fig implies knots legs lift and drag maintain maximum depth maximum downward force maximum lift coefficient measured by echo motors natural frequency net assembly optimum weight plane pounds per square pounds per warp rate of rotation rotation rate shown in Eq shown in Fig spread the wings square foot Suberkrub doors tank towing speed towing vessel variable velocity vertical forces vertical wings warp cable warp length warp tension