Flashcards
9. Secondary Flight Controls
Cards in this deck (34)
- 1what is the main purpose of trimming in regard to stick forcesreduces stick forces or control forces to zero
- 2what is the main purpose of trimming in regard to attitudeallows ac to maintain attitude without pilot intervention
- 3what are trim tabs usually referring tothe moveable or fixed auxiliary surfaces found on small aircraft
- 4what is the main principle of a trim tabF1 (force acting on Aileron)
F2 (force acting on tab)
A (distance from hinge line to F1)
B (distance from hinge line to F2)
A X F1 = B x F2
resultant = 0 - 5what control surfaces are being referred to when talking about moveable trim tabselevator and rudder
- 6what can be said about the movement of the trim wheel and direction of the movement of the aircraftthey must be in the same direction
- 7in what direction are the tabs deflected in comparison to the control surfacesopposite directions
- 8if you are pitching nose down, in what direction do u rotate the trim tabtowards you , up and over
- 9if you are pitching nose up, in what direction do u rotate the trim tabaway from you, down and under
- 10where do u find fixed trim tabsunsophisticated SEPs
- 11what is a fixed trim taba trim tab that can only be mechanically adjusted on the ground
- 12on which control surface will you usually find fixed trim tabsthe ailerons
- 13where might you find a combined trim and anti balance tabon an all moving tailplane
- 14what can you say in general about the position of the flaps for take offthe flap should give as little drag as possible, as drag reduces acceleration
- 15what can be said in general about the position of the flaps for landingshould give the required drag, large amounts, as drag adds to the breaking force and improves speed stability
- 16what can you say about all camber changing devices in regard to the location of the CofPthey do not necessarily impact the location of the centre of pressure
- 17describe the movement of a plain flapcan only travel downwards, it cannot move rearwards
- 18what will change when a plain flap is deployedthe maximum camber
- 19what happens to the value of the Cl when the plain flap is deployedit increases
- 20describe the movement of a split flapcan only travel downwards, not rearwards
- 21what can you say about the separation of the boundary layer of the split flapas the upper surface stays intact, the separation of the boundary layer occurs later
- 22describe the movement of the slotted flapit moves downwards and not rearwards
- 23what is the advantage of the slotted flapit re energises the boundary layer
- 24what happens to the stalling AoA when using a slotted flap compared to a plain or split flapstalling angle of attack increases
- 25describe the general movement of the fowler flapfirst moves rear and then down
- 26what happens to the CP when the fowler flap is extendedCP moves rearward creating a nose down pitching moment
- 27describe the general movement of the triple slotted flaprear first, then downwards
- 28what happens to the CP when a triple or double slotted flap is extendedmoves backwards
- 29what is the basic principle of the krueger flapsto promote root stall
- 30where are the krueger flaps locatedbetween the engine and the root
- 31what can you say generally about the deployment of all flaps, LE and TEthe trailing edge flaps always have a far bigger impact
- 32what happens to the gliding angle when flaps are deployedthe gliding angle increases
becomes steeper - 33what happens to the horizontal distance covered when the flaps are deployedhorizontal distance covered decreases
- 34what is the purpose of the vortex generatorsre-engerises the boundary layer by increasing the kinetic energy
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- POF Flashcards on 9. Secondary Flight Controls, created by Ella Davies on 17/04/2018.
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- Ella Davies
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