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Dihedral - MAE 3241 AERODYNAMICS AND FLIGHT MECHANICS...

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MAE 3241: AERODYNAMICS AND FLIGHT MECHANICS Examples of Dihedral, Anhedral, Adverse Yaw and Leading Edge Extensions April 15, 2011 Mechanical and Aerospace Engineering Department Florida Institute of Technology D. R. Kirk
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DIHEDRAL Dihedral, δ , is upward angle from horizontal in a fixed-wing aircraft from root to tip, as viewed from directly in front of aircraft Purpose of positive dihedral is to confer stability in roll axis δ
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ZERO DIHEDRAL, STEADY LEVEL FLIGHT L W
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ZERO DIHEDRAL ROLL L W Fy V side
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POSITIVE DIHEDRAL, STEADY LEVEL FLIGHT L W
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POSITIVE DIHEDRAL ROLL L W Fy Wing is at positive angle of attack relative to incoming wind V side
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SUMMARY
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SUMMARY
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ANHEDRAL Anhedral required to keep aircraft from becoming too stable Significant anhedral often seen on aircraft with a high mounted wing High mounted wing is above center of mass which confers roll stability due to pendulum effect, so additional dihedral is not required
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DIHEDRAL ( BOEING 737) and ANHEDRAL (BAE 146)
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C-5 GALAXY EXAMPLE
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