METHODS OF LATERAL STABILITY
From what has been said earlier, an aircraft has lateral stability if, following a roll displacement, a restoring moment is produced which opposes the roll and returns the aircraft to a wings level position. In that, aerodynamic coupling produces rolling moments that can set up side slip or yawing motion. It is therefore necessary to consider these interactions when designing an aircraft to be inherently statically stable in roll. The main contributors to lateral static stability are:
• Wing dihedral,
• Sweepback,
• High wing position,
• Keel surface.
A design feature that has the opposite effect to those given above, i.e. that reduces stability is anhedral. The need to reduce lateral stability may seem strange, but combat aircraft and much high speed automatically controlled aircraft, use anhedral to provide more maneuverability.
From what has been said earlier, an aircraft has lateral stability if, following a roll displacement, a restoring moment is produced which opposes the roll and returns the aircraft to a wings level position. In that, aerodynamic coupling produces rolling moments that can set up side slip or yawing motion. It is therefore necessary to consider these interactions when designing an aircraft to be inherently statically stable in roll. The main contributors to lateral static stability are:
• Wing dihedral,
• Sweepback,
• High wing position,
• Keel surface.
A design feature that has the opposite effect to those given above, i.e. that reduces stability is anhedral. The need to reduce lateral stability may seem strange, but combat aircraft and much high speed automatically controlled aircraft, use anhedral to provide more maneuverability.
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