Abstract
A study is reported on a particular type of lift hysteresis discovered while developing experimental geometry optimization techniques for high-lift airfoils. A modern three-element airfoil model with a remotely actuated e ap wasdesigned, tested, and used in low-speed wind tunnel experimentsto investigate optimum e ap positioning based on lift. Hysteresis in lift as a function of e ap position was discovered when tests were conducted using continuous e ow conditions. It was shown that optimum or near-optimum lift coefe cients determined using continuous e ow conditions exist over an extended range of e ap positions when compared to those determined using traditional intermittent conditions.
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