10553486
Description
Flashcards by Aiden Grocock, updated more than 1 year ago
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Created by Aiden Grocock
over 6 years ago
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| Question | Answer |
| 3 movements and their axis? | roll - longitudinal pitch - lateral yaw - vertical |
| 3 control surfaces? | ailerons - roll rudder - yaw elevator - pitch |
| if 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. |
| Describe 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. |
| Describe the details of Elevons? | Used on Delta winged aircraft. - both up or down - elevator - 1 up and 1 down - Aileron |
| 3 lift devices? | Slats, Flaps and Air brakes |
| Where 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 |
| 2 drag devices? | Spoilers and Airbrakes |
| Function and location of spoilers? | On trailing edge of wings - increases drag - decreases lift |
| 4 types of flaps? | plain (55%), slotted (65%), split edge (70%) and fowler (95% increase in lift). (slats increase lift by 30%) |
| when does an outboard aileron become inactive in flight? | At high speeds due to prevention of stress on the wings. |
| what effect would putting both outboard ailerons up together have on the aircraft? | Can be used to "shed" lift. |
| What'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. |
| What'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 |
| Antibalance tab? | inverse effect of a balance tab Disadv: - harder to move Adv: - increases camber - increases s.a - (more lift) |
| What'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. |
| What 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. |
| 2 ways of preventing spanwise flow? | - Saw tooth leading edge - wing fences |
| Purposes of a vortex generator? | - Re-energizes boundary layer - Oblique shockwave forms to weaken the shockwave behind it. - prevents Mach stall (shock stall) |
| where is a stall strip installed? | at the root to allow the root to stall first. (safer than tip stalling first) |
| 3 Regions of air speed? | - Subsonic: air incompressible - Transonic: (some speeds above some below s of s) - Supersonic: air compressible |
| What is Critical Mach No.? | Max permitted speed before aircraft becomes supersonic |
| What properties of flight does a thinner wing give? | - Lower alpha max - Less shockwaves |
| Mach Crit No. can be increased by doing what to the wings? | Sweeping the back. (this acts as if its a thinner wing) |
| Properties 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 |
| different waves formed in supersonic flow? | - Shock Waves (normal and oblique) - Expansion Waves |
| What is the sweep angle of most modern Jet aircraft? | 30 degress |
| Advantages of variable sweep angle? | - higher coefficient of lift in take off and landing (wings swept forward) - efficient in high speed flights (fully swept back) |
| What 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. |
| How 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. |
| When 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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