Theory Of Flight Flashcards
What is the definition of glide ratio?
The glide ratio is the ratio of the forward distance traveled to the altitude lost during a glide.
True or False: A higher glide ratio indicates a more efficient glide performance.
True
What factors can affect the glide ratio of an aircraft?
Factors such as weight, airspeed, wind conditions, and aircraft design can affect the glide ratio.
Fill in the blank: Glide ratio is calculated by dividing the forward distance traveled by the __________ lost.
altitude
What is considered the ideally glide angle?
Typically 3-4 degrees AOA
Potential energy equation?
PE = m x g x h
= mass x gravity x height
Where on a wing is the centre of pressure typically?
25% of the chord from the leading edge (thickest point)
What is the load factor when at zero degrees angle of bank?
1g
What is the load factor when at 60 degrees angle of bank?
2g
What is the load factor when at 45 degrees angle of bank?
1.41
In which direction does the horizontal stab force act in level flight?
Downward force, to pitch nose up
What is positive dynamic stability?
Tendency for the aircraft to dampen oscillations over time to 0 ( back to original state)
What is neutral dynamic stability?
The tendency of the aircraft to maintain its displaced oscillation but won’t worsen
What is negative dynamic stability?
Tendency of the aircraft to when displaced to worsen the oscillations over time
What is the difference between static and dynamic stability?
Static stability is an aircraft’s tendency to immediately return to is equilibrium state, dynamic is its return to equilibrium over time, after some oscillation
What would best describe the stability of an aircraft with a large distance between centre of gravity and centre of pressure?
Longitudinally stable, the great the distance the more stable in this plane
In the turn which wing is producing more lift?
Down going wing, change to relative wind mean the down going produces the additional lift to return to neutral, longitudinally stable
Deployment of flaps will result in an increase or decrease of stall angle?
Increases the stall angle
The trailing vortex on a pointed wing (taper ratio 0) is where?
Root tip or equally along the wing span?
Equally along the wing span
If a swept wing stalls at the tips first the aircraft will_____
Pitch nose up
Pitch nose down
Roll
Pitch nose up
If a swept wing stalls at the tips first, the aircraft will ______
Pitch nose up
Pitch nose down
Roll
Pitch nose up, the centre of gravity always acts as the centre of rotation, so the horizontal stab downward force would still be acting producing a pitch up unbalanced by lift force
How does ground effect influence an aircraft during takeoff?
Increase stall speed
Reduce induced drag
It has not effect
Reduces induced drag, less lift required
What happens to stall angle with and increase in aircraft weight?
It decreases
It increases
It remains the same
It remains the same
What percentage of lift increase does a fowler flap give to a wing and which AOA?
95% increase at 15 degrees AOA
Which type of flap is the only one that increase the chord of the wing rather than the camber?
Fowler flap
