Proposed Methods of Reducing the Cable Load and Tension of High-Speed Towing Targets

摘要

The report analyzes the inter-relationship between the drag of a target and certain properties of the towing cable, namely, its diameter, length, weight, drag, tension and load. As a result of the analysis, a method of towing is proposed by which overall cable tension and cable load on a target can be reduced to such an extent that: (a) The present G-60 Target can be towed with 7,000 feet of towline at 30 knots. This is a considerable improvement over the present maximum speed of about 20 knots with this length of towline. (b) The risk of casualty is reduced. (c) A new design of towing target is feasible with a displacement more in proportion to the useful load carried and representing a large saving in target weight and cable material. The report also examines the changes in cable tensions and cable loads which take place during a 180 degree turn. A method of turning is proposed which produces practically no change in cable tension and cable loads, and by which a turn can be made in approximately one-third of the time presently required. (Author)