Aerodynamic Characteristics of Fin- and Flare-Stabilized 25 mm XM910 Prototypes
Final technical rept.
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Test firings of prototype fin- and flare-stabilized 25 mm training rounds were conducted. The fin-stabilized rounds were found to be capable of fulfilling all of the training round ballistic requirements. The flare- stabilized rounds were studied as a possible lower cost alternative. Initially, a large angle flare design, similar to existing tank gun training round, was tested, but data showed the configuration drag coefficient was too high. Subsequent computer predictions indicated that a small angle flare would have significantly lower drag and sufficient stability for flight. A four-degree flare was fabricated and fired, confirming the drag and stability predictions.
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