Accession Number : ADD017833

Title :   Floating Platform Tow Post.

Descriptive Note : Patent, Filed 28 Sep 93, patented 6 Sep 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Cusanelli, Dominic S ; Bradel, Jeffrey A

Report Date : 06 Sep 1994

Pagination or Media Count : 11

Abstract : A towing post provides a floating transducer platform on a carriage which is arranged for motion in a vertical direction above the center of pressure of a model being tested, for example, by towing across or through a towing basin. Linear bearings are attached to a carriage and engage vertical tracks extending between top and bottom fixed plates of the towing post. One or more transducers may be attached, one above the other, between the floating platform and the model and thus extend through an aperture in the lower plate. Attachment to the model through a gimbal located at the center of pressure of the model allows separation of a measurement, such as of drag, from effects of pOsition and, if desired, a wide range of motion through one or more degrees of freedom, such as pitch and roll. Effects of towing post effects on trim are also eliminated and improved restraint of other motions is achieved. By accommodating more than one force transducer additional measurements can be made for calibration and/or adjustment which, for example, allow effects of yaw to be completely separated from drag measurements. (MM)

Descriptors :   *HYDRODYNAMIC CHARACTERISTICS, *PATENTS, *TOWING, *FLOATING PLATFORMS, PITCH(MOTION), YAW, SHIP MOTION, DEGREES OF FREEDOM, VERTICAL ORIENTATION, TRANSDUCERS, CALIBRATION, BEARINGS, DRAG, SHIP HULLS

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE