Abstract
For certain requirements of trajectory e ight conditions, some parachute ‐ payload systems are mechanically closely coupled systems and have a small diameter ratio of the canopy to the payload. The effect of decreasing diameter ratio on the aerodynamic performance of the system has been experimentally investigated on cross-type rotating parachutes. The results show a signie cant decrease in the drag coefe cient with decreasing diameter ratios, as the forebody wake interferes with the e ow around the parachute. Similarly, with an increase of the forebody’ s diameter, a decrease in the spin was observed. The diameter ratio also affects the static stability. This effect varies between improved stability for short cord cone gurations, commonly used for submunitions, to a reduction in stability when the cords are longer. The investigation also included the effects of the canopy aspect ratio, different support systems, and the attachment diameter of the cords to the payload.
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