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29 Cards in this Set
- Front
- Back
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How does air viscosity change with temperature increase?
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Increase
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How does density change with humidity increase?
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Decrease
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How does temperature change with altitude?
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"0-36,000 ft: -2 deg C / 1000 ft
36,000-66,000 ft: steady -56.5 deg C +66,000 ft: increasing |
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What are the standard atmospheric condition for static pressure?
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29.92 inHg
1013.25 mbar |
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What density does a high density altitude indicate?
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Low air density
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What happens to static pressure, pressure altitude and density over a typical day?
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Static pressure & pressure altitude: virtually constant / density: decrease significantly
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How is density altitude found?
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Pressure altitude corrected for non-standard temperature and humidity
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What is equilibrium flight and 2 examples?
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Exists when sum of all forces and sum of all moments about CG equal to zero. Ex: Straight and level flight at constant velocity or constant climb)
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What is equilibrium?
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Absence of acceleration
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What is mass?
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Quantity of molecular material
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What is Newtons first law?
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Law of Equilibrium: body at rest tends to remain at rest unless acted upon by some unbalanced force
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What is Newtons second law?
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Law of Acceleration: F = m * a
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What is Newtons third law?
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For every action, there is an equal and opposite reaction
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What is pressure altitude?
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Height above standard datum plane
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What is the composition of the atmosphere?
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78% nitrogen / 21% oxygen / 1% other gases incld. argon and carbon dioxide
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What is the equation for kinetic energy?
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KE = 1/2 * m * V^2
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What is the equation for PE?
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PE = weight * height = mgh
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What is the equation for total energy?
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TE = PE + KE
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What is the general gas law equation?
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P = density * R * T
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What is the local speed of sound dependent upon and how does this vary?
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Temperature of air; hotter = faster
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What is the relationship between trimmed and equilibrium flight?
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An airplane in trimmed flight is NOT alwasy in equilibruim flight; and airplane in equilibruim flight IS always in trimmed flight
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What is the standard atmosphere?
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Set of reference conditions giving representative values of air properties as a function of altitude
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What is the standard atmospheric condition for average lapse rate?
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3.5deg F / 1000ft / 2deg C / 1000 ft
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What is the standard atmospheric condition for density?
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0.0024 slugs / ft^3 / 1.225 g / l
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What is the standard atmospheric condition for local speed of sound?
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661.7 knots / 340.4 m/s
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What is the standard atmospheric condition for temperature?
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59 deg F / 15 deg C
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What is trimmed flight and example?
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Sum of all moments around CG equals zero. Ex: constant rate, constant angle of bank turn)
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What is true altitude?
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Actual height above mean sea level
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What rate does static pressure decrease w/ altitude?
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1.0 inHg per 1000 ft at low altitudes
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