|
- What is decalage and how it affects airplane performance?
This article from flying magazine has a nice definition (including some history) Decalage — a French word meaning “shift” or “offset” — is, broadly speaking, a difference between the incidences of any two lifting surfaces It was originally applied to the two wings of a biplane: In the usual arrangement, the upper wing was farther forward than the lower and had a larger (can’t
- glider - Does too big an angle of decalage make the horizontal . . .
The decalage angle of the upper horizontal stablizer slot was measured as arcsin × ( 4 2 0 cm) = 11 5 degrees This symmetrical airfoil will have a high coefficient of (downward) lift when thrown, which would immediately increase the angle of attack of the wing (raise the nose)
- aerodynamics - What should be decalage angle for high lift to drag . . .
Assuming hypothetical biplane variant of a modern conventional glider, wingspan of 8m, 1m separation between the wings, no stagger, no struts, what should be the decalage between the wings assuming
- Why do airplanes usually pitch nose-down in a stall?
Setting the rear tailplane "decalage" to a lower AoA than the wing allows the main wing to stall first However, if CG is too far back, the tailplane must produce upforce This creates the very real possibility that a sufficient change in relative wind can cause both wing and tailplane to stall
- Why should the leading edge of the horizontal tail be lower than the . . .
This produces what is known as "longitudinal dihedral" or "decalage" or whatever you wish to call it Dihedral: Angle between two planes Longitudinal dihedral: Angle between wing and tail More specifically, the difference between wing incidence and tail incidence A positive LD is where wing incidence is greater than tail incidence
- stability - What are the disadvantages of a Tail providing lift . . .
Many planes on the ground show the "decalage" of the tail appearing to provide a lot of downforce, but in the air it will "weathervane" into the wind, torquing the wing to the desired AOA Moving the weight forward on that model needs only adjusting the fore and aft engine thrust percentages for VTOL
- How much torque can a Boeing 747 apply when pitching?
I know this is a weird way of thinking about quantifying this, but I'm trying to figure out how much torque a 747 can apply to itself when it pitches upwards (turning about an axis from wing to w
- How does an aircraft designer increase dynamic stability?
I've seen in claimed that moving the CG forward can actually make dynamic instability worse, because more decalage (download on tail) is needed I don't know the truth of that
|
|
|