Questions tagged [high-lift-device]

In aircraft design, a high-lift device is a component or mechanism which increases lift beyond that obtainable from the main aircraft components. The device may be a fixed component or a movable mechanism which is deployed when required. Common high-lift devices include wing flaps and slats. Leading edge root extensions and boundary layer control systems are less commonly used.

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Do leading edge flaps increase the critical angle of attack?

So from my understanding, trailing edge (TE) flaps increase wing area + camber, effectively increasing the coefficient of lift for a fixed AOA which leads to higher lift at a fixed airspeed and AOA. ...
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Why didn’t the Concorde have flap-canards like the Tu-144?

One of only two ways of which I am aware in which the Tu-144 was “ahead” of the Concorde1 was in its use of retractable flap-canards, which increased the lift on the front of the aircraft at low ...
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What is that protruding fuselage part? [duplicate]

Circled in red above, I suspect that's a high-lift device meant to improve handling at takeoffs and landings, but I don't know for sure really. What is its name and uses?
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Why don’t aircraft have interlocks to prevent high-lift devices from being retracted when doing so would stall the airplane?

Most aircraft have high-lift devices on the wings (such as flaps, slats, droops, whatevs) to allow them to take off and climb out at a reasonable speed instead of having to accelerate to near ...
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Why do I see moisture coming from the middle of the wing as well as wingtip vortices? [duplicate]

A lot of times I see small tube like streams of visible moisture training from the middle of an airliners wing. I assume this is induced drag created by wingtip vortices, when the aircraft is heavy, ...
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What is the relation between flap setting and aileron droop on the A350?

The A350 has a aileron droop function, which is linked to the flap setting. In contrast to other aircraft with aileron droop, the A350s ailerons do not droop when the flaps are fully extended. I ...
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Would the Concorde have been better off using a tailed delta wing?

In one of the answers to this question about the Concorde's lack of high-lift devices on its wings, it was pointed out that the Concorde, using a tailless delta wing, wouldn't have been able to use ...
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Do all A320-family planes have leading edge high lift devices?

I keep seeing pictures of A320/321 planes with slats or some other form of leading edge high lift devices. However, on all my flights in the last years with A320s/321s I never noticed anything ...
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Why didn't the Concorde have flaps or slats?

It's well known that the Concorde had no flaps or slats. The lack of high-lift devices considerably reduced lift at low speeds, requiring the Concorde to take off and land at higher speeds and angles ...
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How is the area of flaps determined?

While may be possible to look up the dimensions of high lift devices in an aicraft's documentation, there is no information on what the underlying design choices are. Using Wikipedia, I found out ...
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What is the appropriate airfoil config for Raked Wingtips?

I'm doing a research about wingtip devices and while I'm searching about raked wingtip, I've wondered what is the best airfoil configuration for it? Should it be the same as the whole wing? My study ...
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What is the purpose of extending one degree of flaps (perhaps with spoilers)?

What would be the use of one degree of flaps? And is there any reason to use both flaps and spoilers combined?
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How do blow holes compare to other means of tripping the boundary layer?

The DG-300 glider has wing holes to delay flow separation. How do they compare to vortex generators and other means? This wing is 'blown' on the underside by 900 small holes to achieve a ...
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Would a slotted “wing” work?

The early history of aviation is full of crazy designs, so please allow me this one: A span wise narrow gap in the wing halfway between the leading edge and the trailing edge. The door to the gap ...
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Could a plane with an electric turbine engine generate enough lift to provide a electric areodynamic lift and runway to space?

This question is similar to my previous ones but configuration is different and so is the question. Could a modified electric turbine engine (E-Fan) plane create enough of its own lift not to burden ...
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Why aren't leading edge root extensions used on airliners?

Why aren't leading-edge root extensions used on airliners? Wouldn't they result in shorter wings and smaller slats? Image source: Wikimedia
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When should I use the global Reynolds number and when the local Reynolds number?

I know that for the wing, the Reynolds number is based on the MAC. This makes sense to me, as the boundary layer develops along the length of the wing. However, what kind of Reynolds number needs to ...
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How do droops help to avoid stalls?

Droops are deployed on the leading edge of a wing of an aircraft, and they work by changing the camber of the wing. How do they help in delaying stall?
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How does the use of Leading Edge Root Extension help in increasing stall angle?

Leading Edge Root Extensions were first used in Northrop F-5A/B Freedom Fighter, which first flew in 1959. After that, many fighter air-crafts have used it, some of which are mentioned after the ...