RESULTS OF EXPERIMENTS WITH MODEL OF HIGH SPEED TOWING TARGETS INCLUDING ESTIMATES OF FULL-SCALE TARGET DRAG AND CABLE TENSION,
Abstract
Five models of high-speed towing targets, two flat-bottom sled-types, two vee-bottom boat-types from Bureau of Ships designs, and one vee-bottom toboggan-type David Taylor Model Basin design, were tested in an attempt to develop an improved type towing target. The models were towed in the basin (a) by a long cable attached to the dynamometer, and (b) under the towing carriage with load increments applied to simulate various lengths of cable. It was found that for a given displacement and initial trim, a change in tow-point position, within the limits covered by the tests, has little effect on target resistance or directional stability. The resistances of the two boat-type targets and of the TMB design target were appreciable less when they were towed by a single cable in place of the conventional bridle, but the effect on the directional stability was small. When towed by the single cable the targets had a tendency to be self righting, after deliberately being capsized. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1947
- Accession Number
- AD0607447
Entities
People
- J. H. Curry
- Jack Posner