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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10
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2answers
459 views

What is the purpose of these movable panels on the MiG-35?

The MiG-35 has movable panels on the LERX (leading edge root extensions). There are a number of images around the web showing these panels deployed during slow flight and retracted otherwise. When do ...
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3answers
2k views

Why aren't thin, delta-shaped wings used for fighter aircraft?

In the past, we used thin, delta-shaped wings (ogival wings) such as those on the Concorde. These wings can be used up to mach 2.2. Due to high fuel consumption, these wings are no longer used ...
10
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7answers
5k views

Why does an aircraft pitch up when the speed increases?

Can anyone please explain why aircraft pitches up when the speed increased? (please consider an aircraft, Wing AC, CG and Tail AC lies on a line.) The ideal explanation I'm looking for should have ...
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0answers
30 views

What angle are front rotors of tandem helicopters tilted and why this value?

I've read that the front rotor of tandem helicopters are tilted forward so that you can get a forward velocity with no nose-down pitching of the fuselage, but what angle is used for this tilt and why ...
2
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1answer
83 views

Is there a minimal legal ground clearance to use an international airport?

The question arises while I was looking at the evolution of the B737 engines and the lower and lower space available between ground and engines. Then I realized that ground clearance is also low for ...
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0answers
147 views

If an fighter jet that it have twin rudders, in use the angle of deployment it is not identical. Which is more deflected and why?

If an aircraft have two vertical tails then pilot push in the rudder pedal the rudders will not be deployed at the same angle.It is used throughout the all envelope of flight or is it possible only ...
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2answers
124 views

Why did the DC-3 have a much higher cruise speed than the HP.42, despite their similar weight and power?

A review of the classic DC-3 and the Handley Page HP.42 yielded a surprisingly close match in empty and max gross take off weight at around 18,000 and 28,000 lbs for the HP.42 and 16,000 lbs and 25,...
12
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3answers
6k views

How are Aircraft Noses Designed?

Look at the Learjet, Embraer and Boeing noses which are kinda pointy - drag efficiency aside, how do they come to the final design of the nose? I’m talking from an aesthetic point of view - how do ...
12
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3answers
2k views

What is this little door on the upper deck of the A380?

I found a little "door" on the upper deck of this A380: Source: Airliners.net What is the purpose of that door, hatch, whatever?
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0answers
109 views

“If it looks right, it flies right” Any examples of a beautiful plane which flew horrible? [on hold]

We find good-flying planes good-looking, mostly. Are there examples of beautiful planes which didn't fly well? EDIT:(Only technically, not if it didn't do well commercially). Well. Beside the ...
13
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3answers
2k views

Why did the F-104 Starfighter have a T-tail?

The F-104 Starfighter was launched in 1954, nine years after WWII. It had short stubby wings and a T-tail. According to wiki, the short stubby wings caused inertia coupling and the T-tail reduced this....
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2answers
135 views

Why are propeller driven aircraft commonly built with a higher wing aspect ratio and a straighter wing angle?

Why do propeller driven aircraft (especially smaller ones like fighters) tend to have a narrower wing with a higher aspect ratio and a more perpendicular wing angle in relation to the body, whereas ...
24
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5answers
4k views

Which aircraft have made notable use of lateral asymmetry?

I'm asking about functional asymmetry - doors on one side but not the other wouldn't count. Examples I can think of three examples: experiments with oblique wing designs, such as NASA's utterly ...
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1answer
336 views

Can electroaerodynamic propulsion be used to circumvent sonic booms?

MIT researchers have created and flown the first plane that doesn’t require any moving parts. “Although it is still a long way off from commercial gas turbine propulsion … electroaerodynamic ...
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1answer
130 views

What's the aisle width of long range business jet?

What's the average aisle width for long range business jet such as Gulfstream G500?
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3answers
193 views

Why the pitch control of helicopter is named Collective Control? And why does it located at the left side of the pilot seat?

This is probably a very trivial for some of you. But sometimes a name not representing the function become a question, just like this Collective Control, which its function is to pitch up the blade ...
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1answer
90 views

How can we generate funding for our miniplane project? [closed]

I want to collect some funding for my new Innovative idea in miniplane. Before this I will show my skill on already exist plane making. Please guide me how can I generate funding for my next new ...
4
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3answers
4k views

Is aerodynamics study compulsory for building a plane? [on hold]

I want to make a plane like a trike. I have a design and some knowledge about plane requirements.
9
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1answer
798 views

What is the relationship between the UH60 Blackhawk stabilator function lateral sideslip and pitch coupling?

I'm having a hard time understanding the correlation between the wind gusts (where are they coming from, what are they affecting) and why, in a nose left situation, the stabilator is driven down. I ...
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2answers
2k views

Why is the empennage design of this Lockheed 1049E so complicated?

Photo. What is the reason for making the empennage of this Lockheed L-1049E Super Constellation's design look so complicated with two vertical horizontal stabilizers? In my understanding, the more ...
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0answers
50 views

Does the F-16 Alt. Flap switch lock the leading edge flaps in place in an emergency?

The Alt. Flap switch is useful for the interception of slower aircraft (Cessnas, Diamonds, etc) at speeds around 145 knots but at the same time you'd have only half of the F16 roll and sluggish gains.
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0answers
74 views

How can I find my all parameters are right or something went wrong? [closed]

I have 220cc bike engine with 11000 rpm. It's 15hp is sufficient to fly or not ? How much wing area I need for lift ?
0
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1answer
52 views

What resources can I get to start learning about Aircraft Aeronautics? [closed]

I haven't yet learnt much about airplanes but I'm obsessed with them and would like to get more info on learning more about aeroplane Aeronautics from any resources possible!
7
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1answer
232 views

Why does the MCAS use the horizontal stabiliser rather than the elevators?

The Maneuvering Characteristics Augmentation System (MCAS), found, in two slightly-different variants, on the 737 MAX and KC-46, provides nose-down pitch inputs in certain very-high-angle-of-attack ...
4
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1answer
253 views

Was the Horten Ho 229 flying wing a three-point-landing aircraft?

The Ho 229's front wheel is visibly bigger than the main landing gear; during landing, did it touch down on all wheels simultaneously, on the front wheel first, or in the normal manner?
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2answers
4k views

Why do T- tail airplanes have a shorter vertical stabilizer?

Airplanes with a T-tail design have a shorter vertical stabilizer than the conventional design , what is the reason?
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2answers
3k views

Why does the Pilatus PC-24 have such a large “Airplane Support”?

The PC-24 has, under the fuselage, a kind of huge support to hold the wings. If we compare with the Citation CJ4 or the Phenom 300, this difference is quite significant. Why??
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1answer
105 views

In fighter jets, is the minimum speed calculated with the flaps in the down position or up? [closed]

I asked that question because F16 flying straight and level at minimum speed does not have flaps down. So how is the minimum speed calculated by aircraft designers?
39
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13answers
8k views

Other than a swing wing, what types of variable geometry have flown?

We're well familiar with swing wings, on small and large aircraft from both the east and west. What other types of variable geometry have been tried?
2
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1answer
439 views

What is this “stick” on top of Cessna 152's wing, and how does it work? [duplicate]

What is this device? What is it for? Seems that some variants have only one, while some others have two. Added: As some have two, so what are they? The answers and comments have not explained which ...
7
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2answers
4k views

What materials are used for aircraft windshields?

Is hard plastic or some form of plastic replacing glass in aircraft windshields? Any idea/companies/players in this field?? I have heard there is recent trend as plastics are light in weight and have ...
3
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1answer
90 views

Why do some airplanes have a vertical rudder hinge while some others are canted?

I was thinking that canted rudder hinges are used for modern aircraft while the vertical ones are used for old slow airplanes. But it seems that I was wrong since the SST Tupelov Tu-144 and the ...
7
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2answers
2k views

Why do airliners still have a switch for the non-smoking sign?

I've wondered why airliners have a switch in the cockpit to turn off the non-smoking sign. Why isn't it illuminated all the time, or a better question: Why is it still there, now that everybody should ...
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4answers
5k views

What is the function of the lower vertical fin on a MIG-23?

I would like to ask about the function of the lower vertical fin in Mig 23 .
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0answers
72 views

what are the winglets on C17's air inlets useful for? [duplicate]

the winglets are clearly visible on this photograph, are they connected with air flow instability?
4
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4answers
2k views

What is the first fighter jet which was built with twin engine and tail configuration?

What is the very first fighter jet that pioneers the twin engine and twin vertical stabilizers over the engine just before the exhaust (like the F-14, F-15, F-22, Su-35, etc)?
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1answer
199 views

What are the holes on the top side of the canard of Eurofighter Typhoon for?

The Eurofighter Canard has some holes on top side. What are these holes for? ?
24
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7answers
21k views

What is the purpose of having contra-rotating props on an aircraft?

Why do planes, like the famous XF-11 and the Tu-95, have contra-rotating props? What is their purpose? Image credit: Mike Freer / Touchdown-Aviation / Wikimedia
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2answers
185 views

Why the Mig21 don't use the ailerons like control surfaces on delta wings at landings or take off?

Mig21 is a delta wing , so why do not use the ailerons like any other delta's ? For lowering the approach and touch down speed. It is not possible that?
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3answers
529 views

When a B-2 takes off, does it use some device to ionise the airflow in front it?

At takeoff, does the B-2 use some sort of ionization device in the leading edges of its wings?
2
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3answers
193 views

Does a biplane need wing twist?

Does a biplane need wing twist? I understand wing twist is used to: creat a soft/partial stall ( hopefully create a partial stall before a full stall) balance the wing so a smaller horizontal tail ...
12
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3answers
7k views

What are the advantages and disadvantages of an oblique wing over a swing wing?

This question asks about the benefits of an oblique wing over a delta wing, but I am more interested in the benefits of an oblique wing compared to a swing wing. Wikipedia states: This is a ...
4
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2answers
108 views

How is lift transferred from rotor to chassis (or weight, the other way around)?

I am trying to find out how a helicopter rotor's lift is transferred to the chassis. Equivalently, how is the weight of the helicopter transferred to the rotor blades? While looking for this online, ...
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3answers
1k views

Why wasn't there a belly gunner on the B-25 Mitchell?

The B-25 Mitchell doesn't have a belly gunner, which would seem quite dangerous. Why didn't it have one?
11
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4answers
4k views

Why is the front section of the Su-30 not aligned with the longitudinal axis of the body?

Please take a look at the picture of the Su-30 below. You will notice that the front section of the Su-30, from the nose to the canopy, is not in alignment with the longitudinal axis of the body. The ...
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1answer
52 views

Where can Cirrus Aircraft VisionJet Oleo Struts Material and Dimension Specifications be found? [closed]

I am looking to get hold of Cirrus Aircraft VisionJet Oleo Struts Material and Dimension Specifications. Can anyone point me to or share where I can obtain these details. So far, I have been able to ...
8
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2answers
176 views

Is autorotation possible from a 0 rpm start at high altitude?

I am working on an enclosure that is to be ejected from a rocket at apogee (10,000') and fall to a target altitude at a descent rate below 20ft/s before releasing its payload. The idea is to have ...
10
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3answers
2k views

Why does the MiG-15 have a cruciform tail?

The horizontal stabilizers of the MiG-15 are halfway up the tail. This is called a cruciform tail. Why did they put them there? Why not a T-tail or the normal tail where the stabilizers are on the ...
5
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1answer
1k views

Is the ATR empennage configuration considered a T-tail or a cruciform tail?

How is the ATR 42/72 empennage considered? Is it a T-Tail or a cruciform tail? From the image the elevators are placed quite high on the tail that they can be considered as a T-Tail but is it so? ...
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0answers
64 views

What’s the pipe behind the F-14 fighter? [duplicate]

What’s the purpose of that pipe?what does it do?