Questions tagged [wing]
For questions on an airplane's main wing
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Downwash, Lift-Induced Drag and Wing Tip Vortices [closed]
I've been reading many of the answers that Peter Kämpf and
Jan Hudec have posted over the years. After many hours of reading the responses here, reading Anderson's Performance and Doug McLean's ...
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Is washout a twist up at the root or a twist down at the tip of the wing?
Does washout/in take place at the root of the wing or the tip? And is the twist distributed evenly along the wing, or is it only twisted for a portion and level for the rest, specifically in ...
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Is Centre of Gravity located behind or in front of Aerodynamic Centre? [duplicate]
I was reading CAE Oxford POF book 2014 edition found online, and in lesson (10-Stability and control), page239, it stated that CG must be BEHIND AC in order to maintain aircraft's stability, but I ...
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1
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What's the optimal taper ratio for a commerical short/medium haul aircraft?
I'm designing an R/C plane with interchangeable winglets and I've so far calculated the taper ratio to be .246 (aspect ratio 9.5 if that helps). I'm taking some design/geometry cues from the A320. How ...
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Why will a positive stagger increase biplane efficiency, while a negative stagger will decrease efficiency?
On a biplane, why will a positive stagger (top wing more forward relative to the bottom one) be more efficient than a negative stagger? In both cases the wing’s pressure fields are more separate, so ...
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Split Flaps and lift?
Do split flaps produce lift? I don't see how, because there is no change in camber.
It seems like an upside down speed break, producing only drag
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How does the air molecules provide wing lift force when only wing is moving or when only the air is moving?
We use to calculate lift force of a wing as function of air speed squared.
We can imagine 2 different situations:
1 - the wind has speed thus kinetic energy and momentum while the wing is stationary
2-...
user76006
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Why don’t closed wings eliminate tip vortices?
It’s clear that tip vortices never really can be prevented, but why doesn’t a closed wing do that? There is no ‘tip’ on a closed wing so where does the air go to make a vortex?
On a normal plane the ...
- 2,838
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Is it possible to tell what aircraft this is?
On a flight a few years ago, I got this picture. Is it possible to tell the aircraft by just this image? I’ve found a few similar but they are a bit different than this one. Someone I was with said ...
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wave drag: Lift coefficient in Korn's Equation
I have been using the Korn equation:
$$
M_c = \frac{0.95}{cos(\lambda)}-\frac{t/c}{cos(\lambda)^2}-\frac{C_L}{10cos(\lambda)^3}-\sqrt[3]{\frac{0.1}{80}}
$$
to estimate the critical mach number of a ...
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How can the wing generate more lift than the thrust? [duplicate]
I recently checked about the max takeoff weight of an A380 and the thrust it can provide at TO/GA power and I was quite shocked by the results. The total thrust by the engines was only about 127000 ...
4
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1
answer
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Why Cessna 152 has different airfoils at the root versus at the tip of the wing?
I recently read that C152 have two different airfoils on its wing. NACA 2412 at the wing root and NACA 0012 the wingtip. Why? And why are those particular airfoils (with their inherent aerodynamic ...
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Lift Coefficient question
I am making a RC Airplane, it has a wing profile as shown above. What might be the approx. lift coefficient of this? The wingspan is 80cm, what will the lift provided be by this wing at 65kmph ?
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NASA's and Boeing truss-braced wing fuel savings breakdown
According to its Administrator Bill Nelson, NASA is working on a project with Boeing that will reduce single-isle aircraft fuel consumption by 30%. He described it as a higher and thinner wing and ...
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How does the lift-to-drag ratio depend on absolute sizes?
A dependency is provided here
$$(L/D)_{\max} = \frac{1}{2} \sqrt{\frac{\pi \varepsilon ~ \mathrm{AR}}{C_{D,0}}}$$
AR significantly affects the outcome in this dependency. AR varies significantly among ...
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