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Surfaces that extend from the wings to increase lift, allowing flight at slower speeds (such as for takeoff and landing).
198 questions
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Why don't commercial airliners have automatic notch-less flaps?
Planes use various flap and slat settings for takeoff and landing. There are auto-flaps for some airplanes, there are spring-loaded slats that extend when the airspeed reduces, and in modern ...
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Can a turbofan airliner climb with clean wings upon take-off?
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Assuming full thrust on both engines, is a turbofan airliner close to the ground right after take-off capable of climbing with clean wings (i.e. with neither flaps nor slats deployed) ?
If ...
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Why do Airbus jets have fewer flap settings? [duplicate]
Boeing jets have a flap setting for like every 5 degrees. Which is great. Going from a flap setting of 30 to 25 saved BAW38. However, Airbus only has 5 i think. Why is this?
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Flap drive mechanism and Flap Fairing
I am working on a project focused on the analysis of A/C systems that can mounted in the wings of H2-powered aircraft. If the fuel tanks are placed in the fuselage, the empty wing space could be ...
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Question on a flapped vs non-flapped wings local lift coefficients
I'm developing a workflow in XFLR-5 for adding flaps/control surfaces to a wing design, and I encountered an interesting thing in my data results that I wanted some more insight on. In plotting a ...
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Effect on Thrust and Power Required Curves of Flaps
I know for a fact that the extension of flaps shifts the thrust required/total drag curve higher. How do I prove mathematically that it also shifts to the left (LDmax with flaps extended occurs at a ...
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Is it better for a flap and/or aileron to be an airfoil shape or simply replicating the trailing edge shape of the wing?
I am designing a UAV with the goals, broadly speaking, of a short take-off and high top-speed. I've already selected the airfoil for the wing itself. The wing is going to have a single slotted flap, ...
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Are flap track fairings (just the appendages themselves) necessary for wing aerodynamics?
Coming from this answer by Peter K?mpf leaving me a little perplexed about the necessity of flap track fairings. without flap tracks, would we still need them on the wing of any given sub/transonic ...
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What drives the mechanical challenges which make trailing-edge flaps an (almost) ubiquitous solution vs leading-edge flaps?
(Apologies for the mouthful of a title.)
I was thinking about canard aircraft and how trailing edge flaps (TEF) are actually counterproductive for them. Leading edge flaps (LEF) could theoretically ...
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Is it pragmatic to use slats and flaps to maintain position of center of lift?
I am coming to this with an amateur understanding of CL, Cp and their contribution to the overall lift of a wing, so bear with me :)
I have been wondering for some time about whether you could design ...
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Split flap variant
Reading about this Q&As, how would a split flap behave if it acted like a solid, with no real split, but a thick trailing edge?
Mostly wondering what happens between a) and c) and influence of ...
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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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Does more lift cause a plane to stall at a lower airspeed?
Does more lift cause a wing to stall later? (By more lift I mean a bigger wing) I was looking and saw this question, but the answers didn’t really address why more lift will help a plane not stall.
...
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Thoughts on Idea - AP Disengage, Land Flap Selection
When AP disengages the aircraft goes into a slight roll or the possibility exists for the aircraft to go into a degree of roll.
Do you think it would be prudent for airlines to include as an SOP for ...
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Visually see flap settings from passenger window behind wing
I've flown on a lot of Airbus and seen a lot of trip reports on YT and wonder if you can visually see the different flap settings (if you are seated at a window behind the wing), for example Up, Flap ...
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