Improved methodology for predicting the force on stalled spinning wings

Adam M. Ragheb, Michael S. Selig

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A novel analytical method is presented for the prediction of the normal force increment due to spin on a stalled wing. This model is based on the concept of fluid in the stalled semi-elliptical-shaped region behind the wing being pumped radially outward by centrifugal motion and ejected at the wingtip, where the ejection of flow at the tip is a new assumption. In the regime of Re ≈ 100,000, the maximum normal force coefficient increment predicted in this investigation was approximately 1.4 based on the wing planform and aircraft pitch angle, θ. The analytical model was validated against wind tunnel tests conducted specifically as part of this research, where the relationship of CN to ω2 was confirmed. Good agreement was demonstrated between the presented model and full airplane rotary balance data for various wing planforms over the pitch range of 30 < θ < 90 deg and nondimensional spin parameter, ω, range -0.9 < ω < 0.9. This method, which advances the current state of the field and leverages recent research from other fields, should provide useful results for wing modeling to provide a better design-for-spin, help improve the fidelity of transport category aircraft simulators for upset, loss of control situations or within the FAA "extended envelope," and aid in the simulations of flapping-wing aerodynamics for micro air vehicles or studies of insect flight.

Original languageEnglish (US)
Title of host publication53rd AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103438
StatePublished - 2015
Event53rd AIAA Aerospace Sciences Meeting, 2015 - Kissimmee, United States
Duration: Jan 5 2015Jan 9 2015

Publication series

Name53rd AIAA Aerospace Sciences Meeting


Other53rd AIAA Aerospace Sciences Meeting, 2015
CountryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering

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