Karteikarten
M11 Theory of flight
Karten in diesem Stapel (31)
- 13 movements and their axis?roll - longitudinal
pitch - lateral
yaw - vertical - 23 control surfaces?ailerons - roll
rudder - yaw
elevator - pitch - 3if an aircraft is banking left, what will the left wing aileron do?left wing aileron on the down going wing will rise and the opposing aileron will stay shut to allow greater camber and lift for the up-going wing.
- 4Describe the details of a ruddervator?V shaped flying control that uses elevators and the rudder.
- If both up - elevator
- if 1 up 1 down - rudder
Adv.: saves weight (no stabiliser)
Disadv: surface area needs increasing, complicated control surfaces and effects stability. - 5Describe the details of Elevons?Used on Delta winged aircraft.
- both up or down - elevator
- 1 up and 1 down - Aileron - 63 lift devices?Slats, Flaps and Air brakes
- 7Where are Airbrakes situated on civil and military aircraft?on structures that can take heavy loads.
Civil: Tail cone (separated to increase drag without effecting lift)
Military: upper surface of aircraft - 82 drag devices?Spoilers and Airbrakes
- 9Function and location of spoilers?On trailing edge of wings
- increases drag - decreases lift - 104 types of flaps?plain (55%), slotted (65%), split edge (70%) and fowler (95% increase in lift).
(slats increase lift by 30%) - 11when does an outboard aileron become inactive in flight?At high speeds due to prevention of stress on the wings.
- 12what effect would putting both outboard ailerons up together have on the aircraft?Can be used to "shed" lift.
- 13What's Horn Balance?Where the rudder or elevator has purposeful segments that are "cut out". This can assist the pilot due to the protection and use of airflow.
- 14What's a Balance tab?device used to "push" the ailerons into the airflow.
Disadv:
- The Camber decreases
- effective s.a decreases
- (less lift)
Adv:
- easier for the pilot to control - 15Antibalance tab?inverse effect of a balance tab
Disadv:
- harder to move
Adv:
- increases camber
- increases s.a
- (more lift) - 16What's a balance panel?A plate connected to leading edge of a control surface. Divides into 2 chambers.
Upper chamber has more static pressure.
This assists deflection. - 17What makes up a trim tab and what happens when it is deflected?Operated by Cables, screw jacks and trim rods.
When its deflected it returns to neutral position. - 182 ways of preventing spanwise flow?- Saw tooth leading edge
- wing fences - 19Purposes of a vortex generator?- Re-energizes boundary layer
- Oblique shockwave forms to weaken the shockwave behind it.
- prevents Mach stall (shock stall) - 20where is a stall strip installed?at the root to allow the root to stall first. (safer than tip stalling first)
- 213 Regions of air speed?- Subsonic: air incompressible
- Transonic: (some speeds above some below s of s)
- Supersonic: air compressible - 22What is Critical Mach No.?Max permitted speed before aircraft becomes supersonic
- 23What properties of flight does a thinner wing give?- Lower alpha max
- Less shockwaves - 24Mach Crit No. can be increased by doing what to the wings?Sweeping the back. (this acts as if its a thinner wing)
- 25Properties of a Transonic Profile?- Flat upper surface
- Curved lower surface
- Thin trailing edge
Gives;
- Greater lift
- Higher Mach Crit
- Can reduce sweep
- Can reduce size of wing and control surface - 26different waves formed in supersonic flow?- Shock Waves (normal and oblique)
- Expansion Waves - 27What is the sweep angle of most modern Jet aircraft?30 degress
- 28Advantages of variable sweep angle?- higher coefficient of lift in take off and landing (wings swept forward)
- efficient in high speed flights (fully swept back) - 29What happens to the supersonic airflow on a transonic profile?Imediately accelerates due to rounded leading edge
Then it slows down due to flat upper surface. (Causes smaller shock wave)
No flow seperation behind the shock wave so this generates lift. - 30How else can a transonic profile generate lift?The unerside has a negative camber
The Velocity is reduced by "diffuser effect"
- Causes more static pressure below and therefore increases lift. - 31When Supersonic airflow passes through a shockwave, what happens to the Density, Temperature, Pressure and Velocity?Density: Increases
Temperature: Increases
Pressure: Increases
Velocity: Decreases
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- Karteikarten am M11 Theory of flight, erstellt von Aiden Grocock am 26/09/2017.
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- Aiden Grocock
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