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Questions and Answers
Explain the relationship between the horizontal tail and the aircraft's pitch response.
Explain the relationship between the horizontal tail and the aircraft's pitch response.
The horizontal tail provides stiffness and pitch stiffness, while its motion creates damping. Balance must be sought with damping, as too much damping leads to poor pitch response, and too little damping causes overshoot in short period mode.
What is the short period pitching mode, and how is it similar to a mass/spring/damper system?
What is the short period pitching mode, and how is it similar to a mass/spring/damper system?
The short period pitching mode is the aircraft oscillating in pitch for a short period of time. It is similar to a mass/spring/damper system because it involves a mass (the aircraft), a spring (the horizontal tail), and a damper (the tail's motion creating damping).
How does the angle of attack affect the airspeed, and what is the period of the short period mode dependent on?
How does the angle of attack affect the airspeed, and what is the period of the short period mode dependent on?
The angle of attack changes rapidly with no effect on airspeed. The period of the short period mode varies based on the aircraft size and maneuverability.
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Study Notes
- Trimmed aircraft subjected to elevator or gusts will pitch
- Aircraft oscillates in pitch for a short period of time
- Short period pitching mode is similar to mass/spring/damper system
- Horizontal tail provides stiffness and pitch stiffness
- Tail's motion creates damping
- Balance must be sought with damping
- Too much damping leads to poor pitch response
- Too little damping causes overshoot in short period mode
- Angle of attack changes rapidly with no effect on airspeed
- Period of short period mode varies based on aircraft size and maneuverability
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