A Samara-Type Decelerator
Final technical rept.
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ ARMAMENT ENGINEERING DIRECTORATE
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This report describes a simple decelerator which drives a submunition in a lunar motion while it descends vertically over a battlefield, scanning for armored targets. The decelerator consists of a single flexible fin with a weighted tip. The idea of using a flexible fin with a tip weight to generate a lunar scan motion was derived from the flight of maple seeds or samaras. Aerodynamic testing consisted of flying various configurations of the submunition in a vertical wind tunnel during which a nondimensional spin to velocity ratio of 0.110 and a drag coefficient of 3.21 based on the submunitions diameter were obtained. A simulation of the observed lunar motion of an axisymmetric model using a rolling body frame, six degree of freedom 6- DOF computer program, and estimates of the aerodynamic coefficients that could not be measured are presented. Keywords Samara Flexible fin Autogyro Decelerator and Maple seed.
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