Conclusion
The use of a smooth surface, for small projectiles, may lead to a reduction of drag at zero angle of attack. However, for specific configurations, especially those with blunt aft sections, an adverse normal force characteristic may develop, causing stability problems, similar to the one described by Schneider (1978). On the other hand, a skilful use of the separation-zone motion could serve as a maneuvering tool for unguided projectiles that are required to perform a search motion, and a built-in instability could maintain the desired motion.
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References
Doherr, K. F.; Schmerwitz, D. 1981: Three component measurements for rigid parachute models. Royal aeronautical society symposium on parachutes and related technologies. London
Schneider, C. P. 1978: Presentation of stability derivatives in missile aerodynamics and theoretical methods for their prediction. AGARD-CP 235
Shpund, Z; Levin, D. 1986: Improved measurement of the dynamic loads acting on rotating parachutes. AIAA 9th aerodynamic decelerator and balloon technology conference. Albuquerque
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Levin, D. Surface roughness effect on the aerodynamic characteristics of a blunt body. Experiments in Fluids 7, 566–568 (1989). https://doi.org/10.1007/BF00187408
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DOI: https://doi.org/10.1007/BF00187408