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Results tagged with aircraft-design
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user 18736
Questions about the different choices that aircraft designers (typically aerospace engineers) make in order to create an aircraft.
1
vote
Is this scaling of aircraft size and power (at least roughly...) correct?
Assuming that length, width, and height of all dimensions are scaled up uniformly, and assuming that weight scaled with L^3, and assuming that the lift and drag coefficients of your wing remain the sa …
- 5,586
1
vote
What role, if any, does visual aesthetics play in the design of modern airliners?
I can't speak much to airframe design, but I can say that in the case of the engines, basically zero consideration is given to aesthetics. Some of the designs do end up looking quite visually appealin …
- 5,586
3
votes
Is platinum present in a combustion chamber?
To elaborate on mins comment: platinum right now is selling for around \$1000 / troy ounce, which is ~\$14,500 / pound. Nickel is selling for around \$4 / pound and cobalt is \$25/pound. Nickel and c …
- 5,586
0
votes
Holding time during static structural testing of a composite wing
Probably not. It's pretty much implied by the word "static" that this is an all or nothing proposition. Either the structure will fail more or less immediately upon reaching the maximum load, or its …
- 5,586
21
votes
What would be the drawbacks of using a rotating engine as thrust reverser on airliners?
First drawback is going to be speed of response. The engine is big and heavy, so you aren't going to be able to spin the whole thing around in a tenth of a second. Realistically, it's going to be a fe …
- 5,586
4
votes
What would be the impact of replacing the engines on the 737 MAX, not just reworking MCAS?
Possible? Yes. Economically feasible, not even close. To re-engine the plane, you would basically have to re-do a large amount of the FAR 25 certification. Right now, Boeing has to re-do one thing, …
- 5,586
11
votes
Accepted
What is the transient bleed valve in a gas turbine engine?
The high pressure compressor in a typical engine has many stages (e.g. GE90-115 has 9) all running on the same shaft, and thus all at the same speed. The problem is that sometimes the flow/pressure th …
- 5,586
3
votes
Why aren't ceramics used in turbines?
Ceramic materials are starting to be used in jet engines. E.g. the LEAP-1A is using a few ceramic matrix composite in the high pressure turbine. (http://aviationweek.com/mro/ceramic-composites-ente …
- 5,586
7
votes
Why use jet engines instead of propellers when designing new airplanes?
Look into Propulsive efficiency (and maybe also this one). Turboprops have a speed of peak efficiency, which is around mach 0.6 or so. If you try to go faster, it gets significantly less efficient. …
- 5,586
7
votes
Why don't bypass ducts in jet engines narrow down the flow to accelerate it?
They do. It's just not by very much. Typical high bypass engine like a GE90 might narrow down the exit area by a few percent. Small enough that you probably don't even notice it when looking at it. Bu …
- 5,586
3
votes
Accepted
Why aren't ducted rotors used in gas turbines?
If I understand your edit, the technical term for what you are looking for is called a "shrouded blade" or maybe a "tip shroud". They are definitely used. Google images will show you many pictures o …
- 5,586
0
votes
What is the structural impact on the wing if no fuel is stored in the wings and just in the ...
I'm a vibrations guys (although not specifically wing vibration), so let me add one point to complete niels nielsen's answer.
If the mass of the wings is reduced by removing the fuel, but the stiffnes …
- 5,586
4
votes
Accepted
Can you have a Hybrid Turboprop-Jet engine?
TLDR: Pretty much impossible with current technology as I understand the question.
I think you are focusing on the wrong part of the problem. Turboprop vs turbofan is pocket change compared to the am …
- 5,586
2
votes
What is the temperature range of engine mounts connected to the pylon?
This is an order of magnitude educated guess:
Based on this picture from Wikipedia:
You can see that the aft mount is attached to the turbine rear frame. As such, it'll get relatively toasty. I'd s …
- 5,586