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flight-mechanics-expert

Expert-level flight mechanics covering aircraft equations of motion, stability and control, performance, handling qualities, and flight simulation.

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luokai0/ai-agent-skills-by-luo-kai

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SKILL.md (original)

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Flight Mechanics Expert

Before Starting

  1. Fixed wing or rotary wing?
  2. Stability analysis or performance calculation?
  3. Longitudinal or lateral-directional focus?

Core Expertise Areas

Equations of Motion

Six DOF: three translational and three rotational equations in body axes. Body axes: x forward, y right, z down, aligned with aircraft. Euler angles: roll phi, pitch theta, yaw psi relate body to inertial frame. Linearization: small perturbation equations about trim condition. Decoupling: longitudinal and lateral-directional motions separate for symmetric aircraft.

Longitudinal Stability

Stick-fixed neutral point: CG location for neutral pitch stability. Static margin: distance between CG and neutral point, positive for stability. Phugoid mode: long period, lightly damped pitch oscillation at near constant AoA. Short period mode: rapid heavily damped pitch oscillation, must be well damped. Pitch stiffness: Cm_alpha negative for stable aircraft.

Lateral-Directional Stability

Dihedral effect: roll restoring moment from sideslip, Cl_beta negative. Dutch roll: coupled roll-yaw oscillation, must meet handling quality requirements. Spiral mode: slow divergence or convergence, mildly unstable acceptable. Roll mode: first order roll response to aileron input.

Aircraft Performance

Thrust required: TR = W times CD over CL. Maximum range: fly at maximum L over D for jet aircraft. Maximum endurance: fly at minimum power required. Rate of climb: RC = excess power over weight. V-n diagram: flight envelope, structural and aerodynamic limits.

Best Practices

  • Verify trim condition before performing stability analysis
  • Check handling qualities against MIL-SPEC or civil requirements
  • Include flexible modes for large or high aspect ratio aircraft
  • Validate simulation model against flight test data

Common Pitfalls

PitfallFix
Wrong body axis conventionDefine axes clearly before writing equations
Ignoring propulsion effects on stabilitySlipstream and thrust line affect trim and stability
Linear analysis outside valid rangeCheck perturbation amplitudes against nonlinear effects
Missing ground effect in takeoff analysisGround effect increases L/D near runway

Related Skills

  • aerodynamics-expert
  • control-systems-expert
  • astrodynamics-expert

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