Questions tagged [wind]

The flow of air with respect to the ground. This will affect the performance and handling of aircraft and can be a limiting factor.

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31
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4answers
19k views

How does wind affect the airspeed that I should fly for maximum range in an airplane?

I have heard that wind affects the actual airspeed that I should fly for maximum range in an aircraft. I understand that wind will not affect the airspeed that I should fly if I am looking for ...
16
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8answers
25k views

Why is tailwind during final approach and landing so dangerous?

I understand that tailwind is typically a good thing during your flight as it increases your ground speed and gets you to your destination faster. Despite that I get a feeling that pilots typically ...
8
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1answer
14k views

How is the wind direction and wind speed measured in flight?

Most large aircraft have a wind direction and wind speed indicator. How is this measured? The vector difference between TAS and ground speed? How accurate is this? In the below picture (taken from ...
43
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11answers
14k views

Is it possible to fly backward if you have really strong headwind?

Is it possible to fly a plane backwards if you have a really really strong headwind? I mean when you are aloft, you have positive airspeed and airflow over the wings but you have negative ground speed....
17
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3answers
2k views

How does a large airport switch flow?

Airplanes prefer to land into the wind, and airports adjust for changing wind direction by changing the active runway. I've been flying a small plane in the pattern when the tower asked me to do a ...
8
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11answers
14k views

Is it sensible to harness wind energy on an airplane?

Is it sensible to harness wind energy on an airplane? Actually the idea is to build an electric aircraft whose power comes from solar and from wind while the plane is landing. instead of using ...
36
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4answers
78k views

When are winds given with respect to true vs. magnetic north?

Wind information can be reported by various sources (ATIS, METAR, TAF, spoken on the radio, etc). I was taught that officially some of these sources are relative to magnetic north and others to true ...
22
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10answers
10k views

Do pilots ever intentionally takeoff or land downwind?

Is there a reason a pilot would takeoff downwind or land downwind? Is it legal to do this?
28
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8answers
5k views

Does a sudden drop of the velocity of the headwind affect the airspeed by lowering it?

I had a discussion about air speeds with one of my instructors recently. He is claiming that there is a sudden drop in the wind velocity as you get closer to the ground (which is absolutely true, due ...
10
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2answers
2k views

Could a plane land vertically in a strong headwind?

I know there are VTOL craft meant to take off and land with a vertical trajectory. But, under the perfect wind conditions, could a normal airplane ever land (safely) with a vertical or nearly vertical ...
30
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4answers
57k views

How is wind direction reported (blowing from or blowing to)?

When the tower controller, the ATIS or a METAR says Wind 270, 15 knots does it mean the wind is blowing in the westward or in the eastward direction? Is there a single convention used to express the ...
10
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2answers
2k views

What wind change gradient is necessary to be classified as wind shear?

Wind shear is defined as a sudden change in the speed or direction of the wind with altitude. There's got to be some ratio of speed to altitude or directional change to altitude beyond which it's ...
6
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1answer
6k views

How can the wind speed and direction be calculated from on-board measurements?

I am currently learning C++ on my own in my spare time. I am writing a little application that will help me while at work. I have come across a situation where I have some given values, but im not ...
1
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4answers
404 views

Why do gusts change the airspeed during landing, but turning (which changes where the wind is coming from) does not?

As we know it, aircraft are extremely sensitive to gust during its final landing stage. They can lose airspeed if the wind changes to tail, ad thus loose lift or need to adjust their thrust in order o ...
19
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4answers
8k views

Do helicopters try to take off and land into the wind?

When helicopters take off and land is it preferable to point the nose into the wind? Since a helicopter is providing its own lift does it matter which direction wind is coming from?
17
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6answers
36k views

What's a quick way to determine which runway to use?

Let's say I call up Wx and have the wind direction and I know the runway headings from my charts and the pattern is empty. I can do the math, but it's tedious and slow and even worse when there are ...
13
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3answers
1k views

Are jet streams a net benefit in time and fuel savings?

Suppose a plane has a cruise speed of 400 knots TAS. In a 4000 nm route we would have a round trip of 20 hours. If there was a jet stream of 100 knots in either direction, we would have 4000/500=8 ...
6
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2answers
851 views

Is it an acceptable practice to take off in a microburst?

This video has been posted on Youtube: Strong winds are blowing at the airfield, pilots are taking off aircraft to prevent them being damaged. However I noticed that gliders have been ...
3
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8answers
16k views

How do head- and tailwinds affect airspeed?

I'm sure this was asked somewhere, I just can't find it. So if it's a dupe, let me know. Anyway, I'm one of those guys that actually looks at the flight information when I'm flying. I fly ...
5
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5answers
6k views

Is head-on or trailing wind better?

Does a powered aircraft fly faster when in a head wind or with a trailing wind? The question revolves around the head wind should provide 'better' lift, and trailing winds have very little to 'push' ...
30
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8answers
11k views

Why might an airliner fly a large U-turn before landing?

I was on a flight1 from San Antonio, TX to Toronto and, when arriving in Toronto, the plane went quite a way past the airport, made a big U-turn, and then landed. We were coming from the west. I ...
13
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2answers
3k views

Why would a commercial flight be landing with a tailwind?

I just flew into BOS on flight 2539 and we landed either on 22R or 22L even though winds were 19 knots at 010 at the ground and 14 knots at 300 at 3000 feet. There was no change either; the captain ...
8
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3answers
4k views

Where can Boeing wind data be found?

There are various services that use world-wide Boeing Winds for forecast wind data which can be used to calculate an approximate flight time between two locations. They usually have best case, worst ...
27
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5answers
6k views

Can airliners land with auto pilot in gusty wind conditions?

Why does the pilot make so many movements? I don't see that plane is moving all that much, but his yoke movements are strong and fast. For someone who is not a pilot, it almost looks like panicked ...
13
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1answer
1k views

On a calm day, what determines the active runway?

When the winds are "calm" or variable, and as such there is no wind direction on which to base the decision on what the active runway should be, how is that determination made?
9
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1answer
7k views

What is the use of heading bug?

When I started searching for Heading Bug (other bugs like altitude, speed bugs), I didn't get much clear idea about it. Usually this is displayed on Horizontal Situation Indicator display on the ...
8
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3answers
12k views

How do pilots detect and respond to windshear while landing and taking off?

How does wind shear affect aircraft while landing and taking off? How do pilots detect that they are encountering wind shear and what would they have to do to prevent it from turning into a bad ...
6
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1answer
2k views

How do pilots clear an aircraft to fly through a hurricane?

This video shows a pilot (Tim Gallagher/NOAA) flying what looks like a small jet into the eye of hurricane Matthew by Miami. It's clear that it is quite an interesting ride. The (small) caption states ...
4
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5answers
4k views

Why does the airplane not 'feel' the crosswind?

Apologies for multiple pictures but I thought they would depict my question more clearly than a lengthy description. Image 1: Why does the aircraft still follow the straight path even if the wind is ...
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1answer
975 views

Is the distance to PNR (point of no return) affected by wind?

Is the distance to PNR (point of no return) affected by wind? I did research it and found some links, but none discussed about the wind.
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2answers
962 views

Could a blimp maneuver using a sail? [closed]

How do you build a sail for a blimp/hybrid airship and what would it look like? Similar to a sail boat how could a blimp maneuver without propellers? Can a blimp sail against the wind? Wind can travel ...
10
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4answers
6k views

In calm winds, which runway should I select at an untowered airport?

In calm wind situations, approaching an uncontrolled airport with no other aircraft reporting on CTAF, which runway should I select that would cause the least safety hazard? Especially at an airport ...
10
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3answers
14k views

Is a wind speed of 150 km/h dangerous during a flight in an Airbus A321?

I am just curious about this... during one flight on Airbus A321 we experienced turbulence and the pilot told us that the wind speed is 150 km/h, so we won't get drinks and snacks due to safety ...
9
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2answers
4k views

Why would aircraft take-off in the opposite direction as landing despite wind direction?

I have visited and flown out of Harare International Airport, Zimbabwe a number of times and the thing that always baffles me is: Why do aircraft use runway 23 to depart, but runway 05 to land? At ...
5
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4answers
2k views

Can this design provide more lift force than thrust from engine?

The problem is depicted in the picture: Generally, why we don't use engine blow wings to fly? Can we use wind-tunnel-like wing to generate lift force? Can it generate more lift than thrust? If it ...
5
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1answer
3k views

Why do METARs report wind relative to true north rather than magnetic?

Why isn't the wind in a METAR given in magnetic heading, to match the runway numbers? Especially for areas where there is a double-digit magnetic declination. Secondary/optional question: does the ...
5
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3answers
724 views

How do I keep coordinated on a windy day?

I've noticed on windy days that keeping the aircraft coordinated can be difficult -- the ball will tend to bounce back and forth in the turn coordinator, and I will find myself "chasing" it with the ...
5
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2answers
7k views

How strong must wind gusts be to prevent landings and takeoffs?

I hope this is not as trivial as it sounds. Is there a wind gusts threshold based on which, at a given airport, incoming flights are diverted and outgoing ones are delayed? I assume that aircraft are ...
3
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0answers
118 views

If the speed of wind at ground is 200 kn, could an Airliner land vertically if it's course is opposite to the wind's direction? [duplicate]

I'm not a pilote and my field is programming, but I was thinking about that question: If the speed of wind at ground is 200 kn (just an example), could an Airliner land vertically (per reference to ...
3
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2answers
189 views

How should I attach an aircraft model in a wind tunnel when testing wind gust/yaw stability?

Where should I attach the rod to the aircraft model when simulating wind gust /weather vane effect in wind tunnel testing? At the center of gravity, behind the CG, in front of the CG...?
3
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3answers
2k views

How heading bug is calculated during cross wind and tail wind?

From this question, it is been suggested to ask different question, rather than keep discussing it under comment section. How is the heading bug calculated and used for navigation when there is a ...
2
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1answer
2k views

What is the difference between ground speed and airspeed? [duplicate]

What is difference between ground speed and airspeed? Is ground speed used only for takeoff or is it used for flight too?
0
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4answers
219 views

What determines the maximum ground speed of hot air balloons?

I am wondering how the ground speed of hot air balloons is controlled. The wind is obviously going to have a large influence upon the ground speed, but apart from wind effects, do hot air balloons ...