Abstract
Spin-tunnel tests and radio-controlled model tests have proven to be useful for prediction of spin characteristics, but these specialized techniques may not be available in early design phases. The present paper discusses other techniques that are more generally available, specifically: 1) conventional wind-tunnel tests, 2) analytical studies, and 3) fixed-base simulation. The techniques and hardware used are described, but the emphasis is placed on the application of the techniques and examples of the type of results that have been obtained. Recent research has indicated that some spin problems (in particular, dangerous flat spins) can be readily analyzed using conventional wind-tunnel equipment and techniques normally employed during routine stability and control investigations. Recent experience with analytical spin prediction methods is discussed using results obtained for a variable-sweep fighter with a long pointed nose. Correlation between theoretical calculations and actual spin characteristics exhibited by a free-flight model of the configuration was quite poor due to large nonrepeatable asymmetric yawing moments created by flow separation on the long pointed nose at high angles of attack. Development and preliminary evaluations of a fixedbase simulator with limited visual and buffet cues for stall/spin studies are also discussed.
Published Version
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