Theodore R. Goodman

Statics and Dynamics of Anchoring Cables in Waves

An analysis is presented of the statics and dynamics of mooring cables. The analysis includes effects that have not been considered by any previous investigator and corrects certain errors that have been perpetuated by all previous investigators. In addition to the discussion of hitherto unsuspected physical effects, this paper also includes a discussion of the numerical computation of buoy-cable systems in waves.

Effect of Hydrostatic Pressure on Underwater Towed Body Cable Confuguration

response curve since with a nonlinear curve the value given will be neither an average nor the value at a particular yaw angle. It would therefore be advantageous to redefine the yaw meter sensitivity C^ which would be appropriate when the yaw meter is kept stationary and the flow angle is evaluated by using a calibration curve. In this case it would be useful to know the average sensitivity over the range of yaw angles being considered, viz.

Use of Jet-Flapped Hydrofoils as Ship Antipitching Fins

Abstract : An analysis is presented to determine the feasibility of using jet flap foils as anti-pitching fins for large ships. The effectiveness of ordinary anti-pitching fins is limited by the occurrence of cavitation. It is shown that the jet flap postpones cavitation until the lift reaches two to three times the no jet value. Boundary layer calculations indicate that cavitation and not separation is the limiting condition for operation of the foil. For an oscillating jet angle, it is shown that at the frequencies associated with wave orbital velocities the forces are quasi-steady and so is the condition for the inception of cavitation. Finally some consideration of the power requirements necessary to operate the jet flap are presented, and it is shown that the power expended to obtain a 25% decrease in pitch is a very small fraction of the total propulsive power available on an aircraft carrier of the Forrestal class. (Author)