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Why is EAS important when considering High Alt Flight
Its used to calculate aerodynamic force produced
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Why is TAS important
Because it is the speed of a body relative to the undisturbed airflow around it
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Why does stability reduce at altitude
As altitude increases, TAS increases and effectively reduces AOA. The consequent reduction in lift results in less stability
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Why is damping in roll effect reduced at high altitude
Down going wing AOA is reduced with the higher TAS so damping in roll effect is reduced ie less stability
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Why is longitudinal stability reduced at altitude (and draw a picture to explain)
If the aircraft is disturbed about tis lateral axis the tailplane generates a restoring force. As altitude and TAS increase the effective AOA reduces so less restoring force is generated and overall les stability
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Why does thrust reduce with increasing TAS
increasing TAS reduces AOA of a prop
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Explain how temp, density, and speed effect thrust when alt is increased
- Temp decreases, which increases density so thrust increases
- Density decreases, thrust decreases however this is offset partly by the decrease in temp
- Spped increases therefore thrust decreases but RAM effect increases thrust so they cancel out
Overall a jet engine is considered to provide constant thrust with increasing altitude
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Why does CL decrease with increasing altitude
- the change in reynolds number
- The decreasing local speed of sound
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As altitude increases, at a constant EAS, whtat happens to Mach and TAS
- TAS increases
- Mach increases more
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With an increase in altitude, directional stability decreases, how do designers overcome this
- Bigger vertical stabiliser
- Or increase the number of vertical stabilisers
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