PL080 - Principles of Flight PPL(A)
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Flashcards
Does a proppeler efficiency (eta)"h" for the fixed propeller can take the value zero? If yes, in what circumstances?
When an air flows by the stream tube with variable changed cross-sectional area the static pressure changes itself. How?
How does the object behave (aircraft, helicopter, hang-gliding, etc.) dynamically unstable after being balanced off?
How does the object behave (aircraft, helicopter, hang-gliding, etc.) dynamically stable after being balanced off?
How does harmful resistance behave with increased flight speed
How does is harmful resistance behave with increased flight speed?
How will the centrifugal force change during turn with the same speed if radius of turn will be reduced?
How will the centrifugal force change if (at the same linear speed) you decrease the radius?
How does the minimum speed and maximum level flight speed change with increasing altitude?
What changes in the arcraft attitude are be responsible for creation of the giroscopic moment of powerplant?
If the wing autorotation is not stopped by the pilot:
If the advance ratio increases:
If the aircraft center of gravity coincides with the neutral point:
If the center of gravity of the airplane with a cambered aerofoil is placed forward of the neutral point:
If the center of gravity of the airplane with a cambered aerofoil is placed aft of the neutral balance center:
If the speed of flight is significantly increased (fixed pitch propeller):
If the RPM of the fixed pitch propeller is significantly incrased:
Angles of attack of individual propeller sections reach a negative value:
When is the blade angle of attack alpha = 0°?
When does the slip of the fixed pitch propeller in a GA airplane equals the geometric pitch?
When does the slip of the fixed pitch propeller in a GA airplane equals zero?
When does the geometric pitch of a fixed pitch propeller in a GA aeroplane equals the effective pitch?
When does the geometric pitch of a fixed pitch propeller in a GA aeroplane equals zero?
When does the effective pitch of a fixed pitch propeller in a GA aeroplane equal zero?
Which of the following changes is not caused by an increase in the engine thrust?
Wich design feature is not meant to compensate for the slipstream effect?
Which description fits the physical unit called "available power"?
Which description of the physical quantity characterizes the work done?
A plane is flown at an angle of attack, for which the drag coefficient CD is at its minimum. As a result of a slight increase of the angle of attack:
A plane is flown at an angle of attack, for which the drag coefficient CD is at its minimum. As a result of a slight increase of the angle of attack:
The measure of static stability is a derivative of Mx = dM / dx, called the "time derivative of M with respect to variable x". What value of the derivative determines instability?
Eccentricity (decentralization) of the propeller means that:
Eccentricity (decentration)of the propeller:
The engine gyroscopic moment disappears when the following ceases:
The yawing moment that is caused by the aerodynamic force acting on the vertical fin due to an asymmetric airflow behind the propeller is called:
At low airplane speed the highest propeller efficiency is achieved:
The type of spin is mainly influenced by the following factors:
Trim tabs settings; -center of gravity of the airplane; -location and size of the tailplane.
The highest glide ratio in a glide is achieved when the plane is flown (in a calm air) with the following speed:
Power load is called:
