1. Theoretical assumptions leading to an aerodynamic loading (symmetric
aerofoil)
- Inviscid potential flow theory over a flat plate at incidence
- Moment about aerodynamic center = 0 for symmetric aerofoil
2. Consequence of divergence instability and design solution to
mitigate/remove it
- Failure of the wing
- Move AC downstream of O (elastic center / origin) i.e. distance between AC
and center of rotation O less than or equal to 0.
3. Why this design generally not applied to aircraft design^
4. Name and explain 3 assumptions of aerodynamics
- Steady Aerodynamics: computed from the static altitude
- Quasi-steady Aerodynamics: computed from the relative wind taking into
account the wing motion. But the aero effect due to a change is
instantaneous
- Unsteady Aerodynamics: takes into account the delay between the wing
motion and the change of altitude – delay related to wake effect
5. Why is the steady aerodynamic assumption well adapted to the divergence
instability?
- Torsional divergence is a static instability which does not involve any motions
of the wing, so steady aero is sufficient
aerofoil)
- Inviscid potential flow theory over a flat plate at incidence
- Moment about aerodynamic center = 0 for symmetric aerofoil
2. Consequence of divergence instability and design solution to
mitigate/remove it
- Failure of the wing
- Move AC downstream of O (elastic center / origin) i.e. distance between AC
and center of rotation O less than or equal to 0.
3. Why this design generally not applied to aircraft design^
4. Name and explain 3 assumptions of aerodynamics
- Steady Aerodynamics: computed from the static altitude
- Quasi-steady Aerodynamics: computed from the relative wind taking into
account the wing motion. But the aero effect due to a change is
instantaneous
- Unsteady Aerodynamics: takes into account the delay between the wing
motion and the change of altitude – delay related to wake effect
5. Why is the steady aerodynamic assumption well adapted to the divergence
instability?
- Torsional divergence is a static instability which does not involve any motions
of the wing, so steady aero is sufficient
