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The Aerodynamics of Flight
Terms in this set (44)
What is the relationship of Lift and Drag in straight-and-level flight?
Weight = Lift
Drag = Thrust
In steady-state flight, what is the sum of the opposing forces acting on an airplane?
If indicated airsepeed is decreased, what needs to happen to the angle of attack for the airplane to remain in straight-and-level flight
The angle of attack has to increase
What are low indicated airspeeds associated with?
High angles of attack and a high nose attitude
There is a decrease in aircraft weight. You want straight-and-level flight to continue, so lift is decreased. How is this achieved?
By decreasing the angle of attack or by decreasing air speed
Why is ice or frost on the wings hazardous?
Because it disrupts airflow over the wing
Are the four main forces in equilibrium in a steady climb when the airplane is not accelerating or decelerating?
An airplane will clear obstacles by a greater margin at the...
best angle-of-climb speed
What is the rate of climb (FPM) for an airplane that climbs 700 feet in 2 minutes
During the transition from straight-and-level flight to a climb, the angle of attack is...
increased, and lift is momentarily increased
What rate of climb is needed to climb 1,200 feet in 2 minutes?
An airplane will reach a given altitude in the minimum time if it climbs at the:
best rate-of-climb speed
What instrument depicts rate of climb?
The vertical speed indicator
True or False? The angle of climb of the same airplane carrying the pilot and three passengers will be less than the angle of climb when only the pilot is on board.
What is absolute ceiling?
The altitude at which the climb performance of an airplane falls to Zero
If the airplane is climbing into a headwind after takeoff, the climb angle relative to the ground obstacles on the ground will be...
Climb performance reduces if...
Weight, Temperature, and altitude increase
What is weight counteracted by for an airplane to be in equilibrium in a steady glide?
Lift and Drag
What effect will adding power while maintaining the same airspeed have on the rate and angle of descent?
It will decrease the rate and angle of decent
True or False? If flaps are lowered, the drag increases and the descent becomes shallower.
False. The descent becomes steeper
True or False? Flying faster than the correct descent speed flattens the descent angle through the air.
False. Flying faster than the correct descent speed will steepen the descent angle through the air.
If the same angle of attack is maintained, will a heavily loaded airplane glide further compared with when it carries a light load?
No, it will glide the same distance
What adjustment to airspeed must be made for an airplane with a light load to glide the same distance as when it is heavy?
Airspeed must be lowered
If you have a rate of descent of 500 FPM, how long will it take you to descend 3,000 feet in a 20-knot head wind
6 minutes, wind does not effect rate of climb or descent
An airplane is flown in a glide at an airspeed where the L/D ratio is 8:1. How many feet air distance will this airplane glide for each 1,000 feet of altitude lost?
How much altitude would an airplane lose in gliding 1 statue mile in still air at an airspeed that provides an L/D ratio of 10:1
.1 miles, or, 528 feet
What is load factor?
Load factor is the ratio of lift to weight
What sort of force is required for an airplane to turn?
What is the force required for an airplane to turn provided by?
Centripetal force is provided by the horizontal component of lift
True or False? To maintain airspeed in a turn, the pilot must apply power to overcome the increased parasite drag
False. The pilot must apply power to overcome the increased induced drag
The load factor in a turn depends on...
the bank angle
If a 60 degree banked turn at a constant altitude sets L= 2:
A) What is the load factor?
B) The wings must generate a force equal to how many times the weight of the airplane?
B) Two times
If an airplane weighs 3,300 pounds, what is the approximate "load" (in pounds) that the airplane structure is required to support in a 30 degree banked turn (L=1.25) while maintaining altitude?
If an airplane weighs 5,400 pounds, what is the approximate "load" (in pounds) that the airplane structure is required to support in a 55 degree (L=1.75) banked turn while maintaining altitude?
What can the turbulent airflow over the horizontal stabilizer cause if the wings stall?
What is the stall angle on a typical light training airplane (degrees angle of attack)?
An airplane wing can be stalled...
at any airspeed and in any flight attitude, provided that the critical angle of attack is reached
Indicated stall speed is affected by changes in...
True or False? At higher weights, the airplane will stall at a higher angle of attack.
False, it will stall at the same angle of attack
Washout designed into a wing causes which section of the wing to stall first?
The inner section
If the airplane approaches the stall angle with a lot of power on, the slipstream adds a lot of kinetic energy to the airflow so separation and stalling is delayed. Is the stall speed with power on the same as the power-off stall speed?
No, power-on stall speed is less than the power-off stall speed
In what flight condition must an aircraft be placed in order to spin?
It must be stalled
During an approach to a stall, an increased load factor caused by turning or turbulence will make the airplane...
stall at a higher airspeed
How does frost and ice affect the lifting surfaces of an airplane on takeoff?
Frost and ice on the wing may delay the takeoff to a higher airspeed than normal
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