Questions tagged [high-lift-device]

Use for high-lift devices such as flaps, slats, slots, etc.

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Is the clamshell on the AN-72 what causes the Coanda effect?

The AN-72 uses the Coandă effect to improve lift and give it better STOL features. In this image of an AN-72 (presumably on a takeoff roll) one can see a clam-shell bucket open at the top of the ...
FreeMan's user avatar
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Aerofoil selection for a Horizontal turbine [duplicate]

I'm currently having a bit of an issue selecting the type of aerofoil I would want to use in my ridge mounted wind turbine honours project. I want to select a high lift generating aerofoil at low ...
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Trailing edge flaps use [duplicate]

Why is it that trailing edge flaps are only used at lower speeds? Can they be used at higher speeds too?
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Are landing gear bay doors meant to help high lift devices at producing lift, when gear is extended, regarding airliners?

Watching some video of one Mig-31 taking off, one can see those doors circled in red in the picture sourced from it, are those meant to produce net lift and reduce take off and landing distance/speed? ...
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How does varying camber affects control over an aeroplane? [duplicate]

How does a trailing edge flap actually help an aeroplane? It just changes camber but what does that exactly do that’s beneficial?
Ranulph's user avatar
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How does deploying full flaps affect Takeoff run and distance?

There is a question in EASA Question Bank (AviationExam) that asks: How will the takeoff distance change if the flaps are increased from 0 to full? (a) Reduce (this is marked as correct since many ...
Uzair's user avatar
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What limits maximum Cl of wing with active jet blowing ("Blowing BLC")?

Maximum lift coefficient of wing (single-element or multiple-element) without suction or jet blowing are limited by boundary-layer separation(flow separation). Wings that use jet blowing for boundary-...
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Is the movement of the leading edge flaps not symmetrical on the MiG-29?

Original: russianplanes.net On this Mig29 in above picture leading edges are at different angles not in line. Same thing happens in flight times when rolling?
George Geo's user avatar
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On fighter jets (e.g. F-16), do the leading edge flaps extend above the retracted position, as well as the more typical down extension?

Do they go both up and down (with respect to a retracted position in the middle) on different fighter jets?
Chickeny Chickens's user avatar
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Why have high lift devices on both leading and trailing edge?

Trailing edge devices such as flaps increase lift by raising lift coefficient at s given AoA. Leading edge devices such as slats increase lift by raising stall AoA. The former is nice because it ...
Abdullah is not an Amalekite's user avatar
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Under what circumstances does the F-16 and possibly similar fighters deploy leading edge slats?

What does the F-16 (perhaps other fighters as well) use to decide when to deploy leading edge flaps? I would assume angle of attack, airspeed, stick deflection, or some combination of the three, are ...
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Did any metal airplane use a Maxwell slot?

The Douglas DC-8 used leading-edge slots. Unlike slots in light planes, this one was door operated. I thought Douglas must have patented it. But as far as I searched, they did not. So it must have ...
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How much is a swashplate system more energy efficient than a fixed blade system for the same load

When reading about the lifting capacity of swashplates (as found in helicopters) vs fixed blade systems (as found in e.g. DJI drones), I read a lot of comments about the fact that the bigger rotors of ...
Arie's user avatar
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Do any regional turboprop aircraft have leading edge high lift devices?

I'm currently working on an aircraft design project for a regional turboprop. I wanted to know if there are any regional TP's with leading-edge devices. It seems that a lot of them have deicing boots ...
Rory McDonald's user avatar
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How many zig-zag patterns are there in a dog tooth leading edge? [closed]

And also what is the difference between saw tooth and dog tooth leading edge? Like is there any difference in the number of "zig-zag" patterns on the wing?
Suraj Mahendra Ramraj's user avatar
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Does leading-edge droop increase or decrease lift, other things being equal?

Consider a conventional subsonic airfoil in level flight. Typically it is cambered and with a small positive incidence, both of which features contribute to lift. Now droop the leading edge, as with ...
Guy Inchbald's user avatar
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What is suction peak?

Can anybody explain to me what suction peak is and does it have anything to do with lift and drag? I've read that suction peak is the point where the coefficient of pressure is the least and is ...
Johnson's user avatar
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Do the F-16's leading edge flaps lock up at +2° when the aircraft as a whole is supersonic, or when the airflow over its wings is supersonic?

My question is: do the leading edge flaps lock upright when the aircraft as a whole is supersonic, or when airflow over wings of the aircraft is supersonic?
George Geo's user avatar
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Does deploying flap change the aspect ratio of the wing?

Specifically when a Plain flap is defleted the geometry of the wing will be altered (Camber is increased). Does this have any effect on aspect ratio? What's the connection between Camber and aspect ...
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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 ...
Vikki's user avatar
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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?
Tom's user avatar
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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 ...
Vikki's user avatar
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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 ...
Vikki's user avatar
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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 ...
Florian's user avatar
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33 votes
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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 ...
Vikki's user avatar
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Why do Leading Edge Flaps (LEFs) create lift while down at slow speeds, but decrease lift while down at higher speeds?

When taking off or landing, both LEFs and trailing edge flaps (TEFs) for fighter aircraft are in the down position to provide more lift. However, when flying around at higher speeds (let's say 500-600 ...
Tom D's user avatar
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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 ...
securitydude5's user avatar
4 votes
0 answers
108 views

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 ...
Henrique Matos's user avatar
6 votes
3 answers
758 views

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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8 votes
3 answers
2k views

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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1 vote
3 answers
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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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1 answer
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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?
Damalani Singh's user avatar
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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 ...
Victor Juliet's user avatar