11.1 - Aero & Flight Control - 5q Flashcards
Pitch is rotating about what axis with what flight controls?
Yaw is rotating about what axis with what flight controls?
Roll is rotating about what axis and with what flight controls?
What is the point where the 3 axis meet?
Control surfaces do what?
What is the cord line?
Differential Ailerons is what and used why?
Frise Ailerons is what and used why?
What way does the rudder deflect is there is RH aileron input?
What controls should be used for turns?
If the aircraft accelerates, what way does it’s Cof P move?
A balance tab moves in what direction relative to the control surface?
What is mean’t by ‘Tuck Under’?
Anti-balance tab moves in what direction relative to the control surface?
Flap deployment does what to span wise flow?
Where does the stall occur on a swept wing?
Extending LE slats will do what to AofA?
What is the function of the Anti-balance tab?
Why is the nose lowered with flaps extended?
When are wingtip vortices strongest?
What is the purpose of a balance tab?
When banking, which aileron produces more drag?
A Fowler flap does what to wing area and camber?
TE flaps cause what and why?
Note: This only applies to airliners/low wing aircraft as trainers/high wing aircraft, when flaps deploy drag is increased at the wing and as the thrust and drag vector differ (low engine, high wing) - it creates a nose up tendency which is greater
What happens lift and drag in a stall?
slat improves what?
What do vortex generators do?
Sweepback does what to lateral stability?
What will happen air passing through an Oblique shockwave?
Fail safe structure means what?
Repair a Chromate Protective finish using?
A stabilator requires what?
A stabilator requires a heavy weight on a long arm inside the fuselage to give it static balance
What does a ‘Foreplane’ do?
At high angles of attack, the canard surface directs airflow downwards over the wing, reducing turbulence which results in reduced drag and increased lift
The low pressure over the leading edge causes the slat to automatically move out of the wing in its track, increase the wing camber, and form a full length duct through which high energy air from below the wing blows back across the upper surface
This type of slat allows the aeroplane to fly at an exceptionally ?
high angle of attach without stalling
The flaps and slats move along….
? increases the effective camber
metal tracks built into the wings
Pivoting the leading edge of the slat and trailing edge of the flap downward
What is the reason for the decrease in stall angle when using flap only?
reason for decrease in stall angle is the local increase in angle of attack
Deploying the slats with the flaps does what to the stall angle?
Deploying the slats with the flaps restores the stall angle and actually increases it beyond the no-flap position
Effect of Flap Deployment on Pitch
When deployed, the bulk of the lift moves to the trailing edge of the wing. - nose down moment
Also there is an ?
If wing is mounted higher than thrust line, nose up moment which is stronger than nose down moment
associated increase in drag at the wing- nose up pitching moment
Describe the design of a strake?
Strake is longer than it is wide, in contrast to a winglet or a vortex generator
Leading edge cuff
typically has a ?
slightly drooped leading-edge to improve low-speed characteristics
What does LERX stand for and what does it do?
LERX = Leading Edge Root Extension
The vortex action maintains a smooth airflow over the wing surface well past the normal stall point, thus sustaining lift at very high angles
What is the purpose of Spoilers and Lift dumpers
Disrupt airflow over the wing, reduce amount of lift
Allows pilot to lose altitude without gaining excessive airspeed
Purpose of speed brakes (air brakes)
increase drag while making little change to lift
Fixed trim tab
Tab is bent so it will deflect the rudder just enough to counteract the unbalanced condition at the desired cruising speed
Adjusted on ground only
Adjustable trim tab
Simple adjustable trim tab is hinged to ? and has a ?
The simple adjustabe trim tab is hinged to the trailing edge of the elevator and has a jackscrew mechanism inside the elevator
Balance Tab
aid the pilot in moving the control against the aerodynamic
moves opposite to the control, pressure differential aids the pilot in moving the control against the aerodynamic
Servo Tab
- The servo tab generates aerodynamic forces that move the large surfaces
- Servo tab is connected directly to the pilots control yoke
- Aerodynamic forces then move the control surface
Control response at low aircraft speed is rather sluggish
Anti-balance tab
- area ahead of the hinge line makes the stabilator overly sensitive
- to decrease this sensitivity, anti-balance tab extending across the trailing edge is used
- The anti servo tab also moves up, producing an aerodynamic force in the direction needed to move the trailing edge of the stabiliator down
- Anti-servo tab counteracts the extreme sensivity caused by the location of the hinge line of the stabilator
- Also serve as trim tab by adjusting length of actuating rod in flight
Spring tab
The tab moves in the opposite direction to the aileron so it provides an aerodynamic boost to help the pilot move the controls
The speed at which the spring starts to be activated is called ‘break out speed’
Horn Balance
Simplest form of this assistance is the balanced control surface
overhang, deflects to produce an aerodynamic force that aids the pilot in moving the surface
Aerodynamic balance panel
- little help when the surface is deflected a small amount
- Increase assistance as the surface deflection is increased
