Questions tagged [slats]

For questions about those devices that swing forwards and downwards from the leading edge of an aircraft's wings, allowing them to produce more lift without stalling. Questions about high-lift devices in general should use "high-lift-devices" instead.

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3
votes
1answer
111 views

Why do fixed slats have a cusp?

Reading this about slat cove filler meant to reduce aeroacoustic noise, it seems there is no big difference in lift if the cove filler is deployed or not. I understand the shape of a retractable slat ...
2
votes
1answer
149 views

Does the A220-300 have krueger flaps or are all of its leading-edge highlift devices slats?

They look like slats to me, but I could be wrong. I'm asking because I know the 737, a very similar airplane, has inboard krueger flaps. Also, what number of slats/krueger flaps does it have?
0
votes
2answers
65 views

What suits best for lateral controllability at high Angle of Attacks- a vortex generator or wing slots?

At high angle of attacks, the prominent problem is the separation of airflow. And if this airflow separation is near ailerons, we lose lateral controllability. And the solution is making the flow ...
0
votes
0answers
50 views

Why is there no anti ice system on inboard slats of A320 [duplicate]

I was going through FCOM of A320 and it was mentioned that there is no anti ice system for inboard slats.
5
votes
1answer
396 views

Why is there an altitude limitation on operating the slats/flaps on the A320?

As per the FCOM limitations chapter there is an altitude limitation of 20000 feet for operating the flaps/slats on the A320? Why this specific altitude?
1
vote
1answer
177 views

At which point in scale reduction do slats and flaps become unnecessary?

Imagine some Fi-156 Storch, and reduce its scale down gradually to 10cm span. Let's assume full scale Fiesler Storch is 100% efficient at, for example, minimizing stall speed. During this reduction ...
2
votes
4answers
3k views

How do slats actually work?

I want to know what is the difference between slats and flaps and the mechanism of the slats This what I know and researched about flaps: Flaps are a kind of high-lift device used to reduce the ...
5
votes
1answer
650 views

What exactly are the "sealed" leading-edge slats in B737 short field performance aircraft?

"The 737 design enhancements allow operators to fly increased payload in and out of airports with runways less than 5,000 feet long. The design enhancements include a two-position tail skid that ...
11
votes
2answers
6k views

Why are Krueger flaps called flaps and not slats?

I always thought that flaps are trailing edge high lift devices and slats are leading edge high lift devices. This is also confirmed by the accepted answer for What is the difference between flaps and ...
10
votes
3answers
2k views

How do slats reduce stall speed?

I've read in PHAK that slats reduce stall speed, but in what way? Is it because of the increase in surface area?
2
votes
1answer
395 views

Would adding a slat and a slotted flap increase the max CL of a multi element airfoil to 6.5?

Would adding a slat and a slotted flap increase the of a multi element foil to 6.5? I understand, as a general rule, the max $C_L$ for a classic NACA airfoil is as follows: Base: 1.5 Slat: + 0.7 ...
0
votes
1answer
178 views

Materials for temporary dent repair?

On a recent commercial flight (A320neo), I noticed some materials attached to the leading edge of a slat (no photo available). The attached material was not smooth, it rather looked like a small ball ...
4
votes
2answers
260 views

Meaning of XX below Slat FLap Trim on A350 with flap setting 1

What is the meaning of the 'XX' in amber below the 1 (in green) within the Slat Flap Trim section on the A350 PFD when the flaps are set to 1 with the correct speed (below 255kts)? See picture ...
4
votes
1answer
214 views

Difference between multi slats and three slats on B737 ? (leading edge devices)

What is the difference between multi slats and three slats on a B737 ?
29
votes
2answers
11k views

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 ...
5
votes
1answer
665 views

What would be the effect of skinning over the gap in fixed leading-edge slats?

The Zenith STOL CH-750 experimental aircraft uses a modified NACA 650-18 airfoil (having a 17% fatter-than-normal thickness) with a fixed leading-edge slat. In an effort to reduce drag and improve ...
12
votes
3answers
2k views

When does a 'flaps/slats misconfiguration' warning sound during takeoff roll?

If a flight crew begins their takeoff roll and don't have slats and flaps configured properly, when does the system know when to sound the alarm? If it actually sounds during the roll itself, that ...
3
votes
1answer
497 views

What effect do slats have on descent rate?

During descent, assuming the same speed and idle thrust, is the rate of descent greater in a clean configuration or with slats?
14
votes
3answers
2k views

Why are the outboard Krueger Flaps retracted before the others on the B747?

In this video, I noticed that the outboard Krueger Flaps on this Boeing 747 were retracted while the middle and inner sets remained extended (refer to 3:22 - 3:30 in the video). My questions are: ...
3
votes
1answer
1k views

How to calculate the lift coefficient of a multi element airfoil?

How to calculate the lift coefficient of an airfoil section with flaps and slats if we know the Cl for the individual elements, like Cl of wing, Cl of slat and Cl of flap?
7
votes
2answers
2k views

What is this tiny slat for?

The one labeled as "1" in the picture. And I'm having doubts about "2", it is an air supplier for cabin, right? Or am I wrong? Thank you.
2
votes
1answer
1k views

What high-lift devices are used on the Bombardier Dash 8 Q400?

What type of flaps, slats or other high-lift devices are used on this aircraft?
1
vote
1answer
595 views

Does the Piper Aztec have flaps and slats and if so what kind?

I was just wondering if any one knows if the piper Aztec has flaps and what kind. Also if the piper Aztec has any other high lift devices.
11
votes
2answers
8k views

What are the benefits of using Krueger Flaps?

I mean why using Krueger flaps in some aircraft instead of using slats all over the leading edge?