Accession Number : AD0292967

Title :   EXPERIMENTAL DETERMINATION OF SURFACE-PIERCING, FULLY VENTILATED HYDROFOIL STABILITY DERIVATIVES BY A FREE OSCILLATION TECHNIQUE

Corporate Author : STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s) : FRIDSMA,GERARD ; BROWN,P. WARD

Report Date : NOV 1962

Pagination or Media Count : 39

Abstract : The results of an experimental evaluation of the dynamic stability derivatives of surface-piercing, fully ventilated, dihedral hydrofoils are presented, including the effects of variation in speed, trim imm r ion, m ss, moment of inertia and frequency of oscillation. T E T R MA BY THE UNCOUPLED FREE OSCILLATION T C IQUE WIT EIT ER FR E O I EAVE OR PITCH. An analysis of the results is pres nte on the basis of quasi-steady theory, including the derivation ofA NEW EXPRESSION FOR THE PITCH DAMPING DERIVATIVE, AND IS SHOWN TO BE IN GOOD AGREEMENT WITH THEORETICAL PREDICTIONS. It is concluded that the qua i-steady theory will be adequate for all prototype designs of surf ce-piercing fully ventilated hydrofoils. (Author)

Descriptors :   *HYDROFOILS, DAMPING, FREQUENCY, MOTION, OSCILLATION, SURFACES

Distribution Statement : APPROVED FOR PUBLIC RELEASE