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Questions tagged [aircraft-development]

Development of an aircraft from an On-Paper design to its final stage as a flyable plane is called Aircraft Development.

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7 votes
2 answers
912 views

Why was the A340 developed with four engines?

The predecessor to the A340 program begun in 1982, when Airbus released the first specification of the designated TA9 and TA11 programmes and in 1986 the TA9/TA11 programmes were officially launched ...
17 votes
4 answers
11k views

Was a six-engine 747 ever seriously considered by Boeing?

The Boeing 747 can carry a fifth engine on the side. As the airframe looks quite symmetric, I think that it would not be big work to hang a sixth engine on the side as well. From here, we seem to be ...
4 votes
2 answers
3k views

How are forces on the landing gear reduced or compensated for at touchdown?

When an aircraft lands with the tires of the landing gear at rest, as soon as the the aircraft touches down, the landing gear experiences a large amount of wheel-spin up forces (because of the static ...
10 votes
1 answer
651 views

Did Lockheed test the TriStar in conditions similar to a century of operation?

I have no source for this claim except a motivational book. I am unable to find anything on Google regarding this. The claim is that they ran a test on s TriStar that put it through the stresses of ...
3 votes
1 answer
2k views

What is the correct range of the 787-10?

There are two conflicting values for the 787-10's range; they are: 6,345 NM (11,750 km) -- boeing.com 7,000 NM (12,975 km) -- on the same website few years ago, as well as flightglobal.com Note: In ...
5 votes
2 answers
4k views

How much does it cost to design a jetliner's wing?

The cost of designing a brand new wing for a jetliner, compared to modifying an existing one—with or without the changes to the production line—how is it estimated? Related questions that come to mind:...
0 votes
1 answer
95 views

Sustainable aircraft technologies

I'm a student starting a research project on sustainable aircraft technologies. I've been particularly interested by distributed electric propulsion (DEP), which is currently being tested by NASA with ...
13 votes
7 answers
7k views

Why does it take so long to develop a passenger aircraft?

I was researching about the Boeing 737 MAX, and came across some information on a Business Insider page: But in the 2010s, Boeing tried to replicate the success of the 737NG with the 737 Max. But ...
7 votes
3 answers
732 views

How does one develop artificial stabilization for aircraft uncontrollable without it?

In an answer about the F-117 Peter Kämpf writes F-117 (...) is unstable and uncontrollable without artificial stabilization. I wonder how such an aircraft comes to existence, specifically how one ...
4 votes
1 answer
551 views

Is it coincidence that the B-2 and YB-49 flying wings have exactly the same wingspan?

Development of the Northrop Grumman B-2 Spirit began as far back as 1979; however, this was nearly thirty years after the last flight of Northrop's earlier flying wing the YB-49. There aren't many ...
13 votes
3 answers
8k views

How are composite materials on aircraft joined?

Answer for the question Why are planes using rivets & not welded construction? describes why rivets are preferred for joining aluminium alloy components. But how are carbon-fibre-reinforced ...
7 votes
1 answer
384 views

When were checkerboard fiducial markers first used in aircraft development?

It's common to put checkerboard fiducial markers on aircraft to help analyze rates and orientations from photographs and film. When was this practice first used on aircraft? Flight test versions ...
5 votes
2 answers
485 views

How come Boeing invested \$32 billion on the 787 program and Airbus only \$15 billion on the A350?

How come Boeing invested \$32 billion on the 787 program and Airbus only \$15 billion on the A350? (according to wikipedia)
0 votes
2 answers
782 views

Where can i find aircraft blueprints for study purpose? [closed]

I'm a 3D artist and i want to start my new project. I'm going to create an exact model of the Embraer 190 aircraft. I need this for my graduation project at the university (I chose such a project, ...
13 votes
1 answer
1k views

What's the point of the Total In-Flight Simulator?

Picture of the contraption: Source: wikimedia.org After a quick research, and Simon's link, it turns out to be a simulator for how different aircraft would handle. And was useful is simulating ...
36 votes
7 answers
39k views

Why are planes using rivets & not welded construction?

I was motivated to ask by this question: Why are airplanes riveted and not screwed? Why not welded construction? Is welding these alloys too difficult? I come from a refining background & in a ...
116 votes
13 answers
43k views

Why does it take so long to develop modern military jets?

In the 1960's, it took three years to produce a flying prototype of an aircraft that flew faster than anything before, was built out of a novel construction material, used a new type of fuel, and was ...
2 votes
1 answer
617 views

Could simple fly-by-wire controls be installed in a prototype as quickly as a mechanical system with an autopilot?

It seems that fly-by-wire systems can take longer to get certified as the testing requirements are much more extensive. A prototype aircraft wouldn't have to pass these tests. How much more time or ...
0 votes
2 answers
331 views

Why manufacturers does not producing variable sweep wing in our current scenario? [duplicate]

I read about many types of aircraft wing configurations like rectangular, swept forward, swept backword, and Delta wing. These configurations have their own advantages and disadvantages. But why we ...
5 votes
1 answer
426 views

What does Lockheed have to do to mark the end of the F-35's SDD?

What does Lockheed Martin have to do to mark the end, or close out, the System Development and Demonstration phase of the F-35?
8 votes
2 answers
1k views

If maximum speed was a priority for modern military fighter jets and bombers, approximately how fast would they likely be?

Burt Rutan talks rather passionately about the lack of innovation in space flight, but also mentions how fighter jet (maximum) speed performance has stalled: In fact,...
1 vote
0 answers
260 views

Does the C series from Bombardier incorporate composite materials into the fuselage and/or wings?

Does the C series from Bombardier incorporate composite materials into the fuselage and/or wings? If so, what material is used, and where is it applied. Because of Airbus's 50% market share in the ...
0 votes
0 answers
91 views

What limits the size of the aircraft? [duplicate]

Why is it so hard to make large aircrafts? Boeing stopped after the 747. They haven't made a larger plane ever since. Airbus A380 took a long time for it to be designed. In June 1994, Airbus ...
0 votes
1 answer
82 views

Besides size, what determines the cost of creating a composite structure for a single engine piston aircraft? [closed]

When designing an aircraft (LSA or GA), how would one minimize the cost of construction when the aircraft is composite. To be clear, I am talking only about the structural components, not the interior,...
2 votes
1 answer
564 views

Does RTCA/DO-254 apply to power electronics?

DO-254 provides guidance for the development of airborne electronic hardware and it is recognized by the FAA in 2005 via AC 20-152 as a means of compliance for the design of complex electronic ...
8 votes
1 answer
1k views

Why did it take so long for helicopters to be developed/in use?

The Sikorsky_H-5 was made in 1943 but used an engine released in the 1930's. It seems to me that the used that applied to helicopters, specifically in warfare, could have applied much earlier. Things ...
2 votes
1 answer
531 views

What tests are done on aircraft wings for testing the effects of lightning? [duplicate]

During the testing phase of aircraft wings, there are lot of testing like temperature, pressure, humidity, vibration and load/stress. Apart from these, does any one have idea which other tests are ...
4 votes
1 answer
1k views

What do aircraft designers like Burt Rutan do to cheaply practice geting good at designing aircraft? [closed]

I am a new aircraft designer, and work for a small company (which doesn't have the enormous resources of a Boeing or Lockheed) so we have to work with limited resources to get good at our trade. I've ...
3 votes
1 answer
571 views

How are $V_r$ and $V_2$ determined?

$V_r$ is the speed at pilot should initiate rotation on take-off and $V_2$ is the safe climb-out speed. Pilots determine them for each take-off by looking them up in a table in POH or QRH or somewhere....