POF T2
pof
pof
Fichier Détails
| Cartes-fiches | 336 |
|---|---|
| Langue | Deutsch |
| Catégorie | Physique |
| Niveau | Autres |
| Crée / Actualisé | 16.05.2015 / 22.07.2020 |
| Lien de web |
https://card2brain.ch/box/pof_t2
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the min. speed at which lift equals weight is calles
VS1g
When looking at the airflow over the wing, from the wing surface and up, the air is:
With increasing AoA the CP will reach its most forward point :
Which aeroplane design has the highest probability of a super stall?
the purpose pf a fixed spoiler on the leading edge of a wing at the root is to:
The load factor is less than 1
1) stall speeds are determined with the CG at the forward limit
2) Min. control speeds are determined with the CG at the aft limit
1 and 2 correct
A fixed staal strip on the leading edge of teh wing at the root will:
Accelerated STall:
deep staal:
Accelerated STall: the staal that occurs while teh aircraft is experincing a load factor higher than 1 g ==> staals at higher speed
deep staal: dangerous => that affects certain aircraft designs, notably those with a T-tail conf. the turbulent wake of a stalled main wing blankets the horizontal stabilizer, rendering the elevators ineffective and preventing the aircraft from recovering from the staal => AoA between 40-60 degrees
fixed spoiler ?
a stall strip on the leading edge => the sharp leading edge of the stall strip ensures a lower stalling angle than the rounded leading edge of the wing and thus inducing stall
Staal speed increased => Formel mit Gewicht
V s new = vs old x Wurzel( new weight/ old weight)
WIe verhält sich die stalling speed mit der Höhe ?
constant at low altitudes as long as the speed is low enough for compressibility effects not to be present ==> stall speed Increased with altitude increasing
Wing forces => what theay do?
prevents the outward draft of the boundary layer and thus reduces the tendency to tip stall => higher AoA
what makes the tailplane?
normally produces a downwards force => when the tailplane stalls, the downward force will be gone immediately and the aeroplane pitches down
Difference straight and swept wing on stalling speed? Anhedral and T-Tail?
Anhedral and T-Tail no influence on stalling speed => wing sweep causes the Cl curve less slope and a smaller value of CL max than straight wings => the higher sweep, the lower the value of CL MAX = a higher stall speed
What is a spin?
a spin is a controlled or uncontrolled manouevre, = stalled situation (both wings are stalled) with the nose usually pointed sharply downwards in which the aircraft descends in a helical path with an AoA greater than the Angle of max. lift => Occurs with teh wings in a stalled flight condition plus a yaw and roll n the same direction and that it can develop in any attitude, at any airspeed at/or below manoeivering speed
