Accession Number : AD0465722


Title :   EXPERIMENTAL DETERMINATION OF THE APPARENT MOMENT OF INERTIA OF PARACHUTES


Descriptive Note : Final rept., 15 Apr 1963-1 May 1964


Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF AERONAUTICS AND ENGINEERING MECHANICS


Personal Author(s) : Ibrahim, Shukry K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/465722.pdf


Report Date : Apr 1965


Pagination or Media Count : 57


Abstract : An experimental arrangement for determining the apparent moment of inertia of parachute canopy models is described. The rigid canopy models are attached to a simple torsion pendulum and the periods of oscillation of the models and suspension system in air and in water are measured and used to calculate the apparent moment of inertia of the model canopies. The validity of the experimental arrangement was verified by measuring the apparent mass of some simple geometric bodies such as spheres and cubes and comparing the results with known theoretical values. Models of the circular flat, ribbon and ribless guide surface canopy shapes were tested for angular motion about two different axes and the results are presented in nondimensional coefficient form. Additional results showing the effect of geometric porosity on the apparent moment of inertia of a ribbon type parachute canopy model are presented in the appendix.


Descriptors :   *PARACHUTES , DECELERATION , GEOMETRIC FORMS , HYDRODYNAMICS , KINETIC THEORY , MATHEMATICAL MODELS , MOMENT OF INERTIA , MOTION , OSCILLATION , PARACHUTE DESCENTS , TEST METHODS


Subject Categories : Gliders and Parachutes


Distribution Statement : APPROVED FOR PUBLIC RELEASE