Questions tagged [aircraft-design]

Questions about the different choices that aircraft designers (typically aerospace engineers) make in order to create an aircraft.

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1answer
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Antennas on airliner wings? [duplicate]

From the question about sharp pods under airliner wings, I think the right term is anti-shock bodies, or flap actuators/track fairings. What's the little antenna looking thing extending off the rear ...
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3answers
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2answers
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Why are CJ2+ Anti-Ice & De-Ice Systems separately controlled?

Why are the CJ2+ anti-ice and de-ice systems separately controlled? Wouldn't it be easier for both systems to be controlled with one button/switch (minimize chance of error from occurring)? Are there ...
11
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5answers
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Is constant air pressure maintained inside the fuselage?

I just heard it somewhere but I'm not sure about it. If it is, then why don't they build airtight fuselages?
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0answers
119 views

Why do newer commercial aircraft have their wingtips curved up? [duplicate]

Lately I've seen a lot of aircraft that have the wingtips curved up. What is the reason for this?
15
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4answers
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How is the weight of an airplane measured?

Many very large airplanes have specific information of their empty weight. For instance the weight of an empty, regular 747-400 is 393,263 lb (178,756 kg) according to Wikipedia. The Concorde is 78,...
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2answers
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if temperature is increased but the volume contained in a area, will an air balloon lift?

I understand the archimedes principle as it relates to water, but am having trouble reconciling a thesis related to a hot air balloon. If theoretically, I could increase the temperature of air ...
26
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3answers
3k views

Is wingtip design mature?

There are many wingtip design, all made to reduce vortex related drag, and neither boeing nor airbus seems to prefer one over another. They move from one design to another at each new aircraft, always ...
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1answer
986 views

Supersonic Fuselage design [closed]

What should be the ratio of the fuselage and wings in a maximum dimension limited condition supersonic delta wing aircraft? Also can anybody explain clearly the "supersonic area rule" or "Whitcomb ...
20
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1answer
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What is the purpose of the three cylinders under the engines of the Junkers 52?

They're mounted underneath each engines on the JU-52. I saw them up close at the museum. Each one consists of bundled half-inch pipes running through the whole length, open at both ends.
14
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1answer
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Why simple paper planes fly better than most “realistic” paper plane models?

Just a A4 paper sheet folded into a plane seems to fly decently. But a model of actual (big) plane made out of paper is only good at falling... What is different for paper planes? Are there "modern ...
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2answers
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Why is dual crossfeeding prohibited on DA42?

Diamond 42 AFM says: The fuel crossfeed function can be tested simultaneously with both engines. Proper function can be tested by running the engines for approx. 30 seconds with CROSSFEED ...
18
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6answers
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What are the factors that limit how long an aircraft can stay aloft?

The most obvious one is fuel. Many modern military aircraft, however, are capable of refueling in mid-air. Crew fatigue, another obvious one, can also be addressed by rotating a crew out, and is a non-...
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Would a vertical stabilizer that extends both above and below the centerline be benefit or hindrance?

Ignoring for a moment potential schematic difficulties in creating an aircraft that can land and take-off without threatening a downward vertical stabilizer, would a vertical stabilizer that extends ...
18
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1answer
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Why the different wing and tail designs in similar sized jets vs turbo prop?

I was flying on Porter Airlines and they had an info card about how similar the Bombardier (I still say DeHavilland) Dash 8 Q400s are to the Bombardier CSeries they have ordered. There was a cool ...
5
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2answers
878 views

What exactly is the afterbody of an aircraft?

In my understanding the afterbody is everything trailing behind the nose of the craft excluding the wings and fuselage, and will thus include the empanage. What exaclty is meant by the afterbody?
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1answer
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What is the chord of a wing?

In the answer to this question the author mentions the chord of a wing. What exactly is that, and how is it used in wing design?
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1answer
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Can your intestines be sucked out by a commercial aircraft's toilet? [closed]

Say for example you have a complete seal (unlikely) between yourself and the toilet. Is the amount of suction possible to pull one's intestines (or insides) out and into the toilet? I think (probably ...
16
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4answers
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Why don't both black boxes hold the same data?

As I understand, there are two black boxes on-board an aircraft. One black box, the Cockpit Voice Recorder holds the cockpit conversations and the other, the Flight Data Recorder holds essential ...
12
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1answer
6k views

What protection does Vno provide?

VNO, the airspeed where the green and yellow arcs meet on the airspeed indicator, is the "maximum structural cruising speed" (FAR 1.2). An airplane should only be flown above VNO in calm air. ...
2
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2answers
2k views

Is it possible to prevent plane accidents due to fuel explosion?

We know that most of the plane accidents and deaths result from the explosion of fuel tanks in the planes, like when two planes collide, or when the plane falls on the ground. With the advent of ...
13
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3answers
14k views

What is differential braking?

How is differential braking different from regular braking? How do you accomplish differential braking and why would you need to use it?
10
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2answers
4k views

What is the benefit of spoilerons compared to ailerons?

Some airplanes like the B-52 or the MU-2 use spoilerons instead of ailerons to control roll. What is the benefit of ailerons vs spoilerons and vice versa?
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2answers
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What are the risks involved when doing a classic zero-g maneuver?

I suspect most pilots have done it at least once: briefly experience zero g when flying a parabolic path. It's quite an experience (if your stomach can handle it). Question is: are there any risks ...
13
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1answer
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When Boeing designed the 737NG, what factors influenced the change in the flap system?

The early Boeing 737 models had wings with triple-slotted flaps that appeared to be derived from the 727. When the 737 was redesigned as the Next Generation series (dash 600 through 900), these flaps ...
5
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2answers
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Structural design software for airplanes [closed]

What are the main structural design software packages that are used by the most of the aircraft manufacturers. There are a number of software packages but which one is widely accepted and used for the ...
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2answers
1k views

Where are the first structural damages after maximum speed is passed? [closed]

What 2 parts of the airframe are the first to have structural failure after exceeding maximum speed? Sorry. I just thought there might be a part that usually failed first.
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2answers
607 views

Is it possible to “pimp up your aircraft” with an audio system?

Can aircraft be modified to have an enormous audio system, like the ones in cars? Has the FAA got any regulations on this (or maybe on in-cabin maximum noise volume?), would power be a limitation for ...
2
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2answers
671 views

Quadcopter Design [closed]

What would be the most optimal shape for a quadcopter design? I have tried the cross beam design, but the center joint, though epoxied, is extremely prone to shearing off on impact.

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