Federico
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  • Member for 7 years, 10 months
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Could airline tires be deflated in mid-flight to reduce weight?
102 votes

You want to reduce weight by removing a few kilos of air, and adding an equal, if not greater, amount of kilos of pumps needed to reflate the tires (see David Richerby's answer for details), not to ...

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Why does this 757 have a propeller engine attached to the fuselage?
Accepted answer
94 votes

From the description below the image you linked: The Honeywell, Boeing 757 test bed appeared on static display for a few days before departing half way through the event. A testbed aircraft is an ...

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Why is a part from a Boeing 777 being analysed by Airbus?
69 votes

Why are they taking the wing to Toulouse, FR? Because the part was found on the island of Réunion, which is French territory. Why is a part from a B777 being analysed by Airbus? It is not. Airbus ...

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Why aren't airliner windows aligned with their seats?
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56 votes

Because the pitch of the frames is not related to the pitch of the seats. The windows placement have to cut through as few frames as possible. You can see it in the following picture, noting that ...

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What type is this aircraft with "inverted" wings?
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52 votes

If I am not horribly mistaken, it seems to be an Antonov 72 or 74, that were produced together, hence the similarity. Another image (not included for copyright reasons) can be found here. The ...

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Why don't short runways use ramps for takeoff?
50 votes

Because then you can only land in one direction. What do you do if the wind blows exactly along the runway so that departing and landing planes have only tailwind then? You would waste a precious ...

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What are the main differences piloting Boeing vs. Airbus aircraft?
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50 votes

On a pilot-vs-FBW system perspective, as mentioned in the comments to the question, the most notable difference is the authority priority: Boeing trusts more the pilots: they can supersede the Fly-by-...

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How could the Helios 522 passengers have survived so long without oxygen?
47 votes

To add to Daniele's answer, from the final report: The forensic report concluded that the aircraft occupants had heart function during the impact. The report noted that this ...

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Why do airplanes not have manual transmission?
46 votes

Because most aircraft engines do not have geared transmission at all: Image from wiki The power is directly transmitted from the turbine to the compressor with a rigid shaft. It is true, though, ...

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Do commercial aeroplanes use ABS to brake?
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42 votes

Yes, they do. They are called Anti-Skid and they go from Mark I of 1948, with simply an on-off switch triggered by wheel lock, till Mark V (or at least that's the last I've seen), with quite complex ...

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How much is airspeed reduced on an A10-Warthog when firing its cannon?
40 votes

What acceleration is being applied to the aircraft (In m/s or kt/s)? From XKCD we know that the gun produces almost five tons of recoil force that is about 50000 newtons (round numbers for ...

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Why is this plane circling around the Lucknow airport every day?
39 votes

That is a plane being used to train/practice landings. It is without passengers and one of the pilots is training. There will also be another pilot on board, possibly two, providing support and ...

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What is the purpose of the hole in the Cirrus SR22's parachute?
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38 votes

For me, it seems that air can escape the parachute by this hole That's the point, air HAS to escape the parachute anyway, and without the hole it would do so laterally and in an uneven fashion, ...

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What does RTF mean?
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37 votes

"RTF Instructions" probably means "Radiotelephone Instructions" As suggested here, it should not be confused (as I initially did) with the "RTF" of internet fame (from RTFM, for those that are still ...

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How much physical strength is required to control a Cessna 172?
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33 votes

I will take this from a more general perspective. A Cessna 172 is part of the CS-23 category (in EASA land, see the equivalent Part 23 for FAA land). In the relevant document, point CS 23.143, we ...

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How common are cancelled landing attempts?
32 votes

Q: Was it dangerous? Is it according to standard procedure when approaching an airport in bad weather conditions? If the aircraft did not go below the Decision Height, no, it was not dangerous and it ...

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What is the immediate cause of stall?
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32 votes

The immediate cause of a stall is the detachement of the airflow from the wing: Image from NASA This happens when your Angle of Attack is too high. How can the AoA become too high? --For level ...

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Why do airliners have "pressure bulkheads"?
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31 votes

What part aft of the bulkhead would leak pressure? That's a partial misunderstanding of what a bulkhead is there for. You could build the aft cone section to keep the pressure, but it would be a ...

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Why aren't the canards used as airbrakes on the Tupolev Tu-144?
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30 votes

A number of things happen when you rotate the canards by 90°, and in no way I see how these could be addressed by not too many modifications 1. Transient Once you land, you need a certain amount ...

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What are these engineers doing sitting on a large format drawing of B-47s aircraft?
29 votes

Just to confirm, one of the sites you mentioned says: Планирование производства бомбардировщиков B–47 на заводе ВВС США №6. Завод ВВС США №6, был построен в 1942–1943 годах в небольшом городке ...

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Why are test crashes not made harder on the airframe?
29 votes

Because they wanted to analyse survivability, making the crash non survivable would have defeated the point.

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Why do some flights make turns shortly after takeoff?
28 votes

It is mostly standardized procedures. I take as example Amsterdam airport (AMS), but the following is applicable to most, if not all, major commercial airports. Let's look at the departure charts, ...

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What's the function of the plate behind the wheels of the Pilatus Porter?
27 votes

Looks like a sort of gravel kit. Real gravel kits are used by jet powered aircraft to land on rough airfields. In this case though, the engine is in front, so it is likely that it is only there to ...

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Are cabin dividers used to "hide" the flex of the airplane?
Accepted answer
26 votes

Was my fellow passenger right? No. That photo is taken in a B777-300 (2 aisles, 4 seats in the centre and three at the sides, lavatories only behind the central rows, rows on the left side of the ...

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Can aircraft other than rockets go to space?
Accepted answer
26 votes

Depends on what you mean. Get to high altitude? Yes you can. It is really inefficient to get there, but some aircraft already do it. Achieve a stable orbit and be able to maintain control? No, at ...

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What is this plane and what are the rockets on the back used for?
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26 votes

As the source linked next to the image in the other question says, it is a C-130 performing a "rocket assisted takeoff". These are performed to safely achieve V1 on short airfields, where the ...

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How is metal fatigue detected in an aircraft?
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25 votes

How do the engineers, maintenance team, etc know if an aircraft has metal fatigue? First of all, is not an "aircraft" that has fatigue, but a component. To the naked eye, there is no way to detect ...

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What is the purpose of the sharp pods under airliner wings?
25 votes

They are not fuel tanks, the fuel tanks are inside the wings. Those are covers for the flaps actuators: since the actuators and their rails protrude beneath the wing, without a cover they would ...

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How does an alpha (AoA) vane work?
24 votes

From what I have studied at my instrumentation course, it rotates and reads the angle between the current position and the reference position. You then have several (3-4) of them around the fuselage ...

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Why does an aircraft not spin out of control right after touch-down?
Accepted answer
24 votes

how does it not immediately start spinning? Physics, and engineering. But I guess that you would like a bit more detail, so let's try dive in. wheel brakes They tend to have a stabilizing effect ...

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