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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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2k views

Is the “glass nose” Tu-134 design for easier conversion to military use?

Early versions of the Tu-134 had a glass ('glazed') nose that is unusual for a passenger airliner. It was removed from the later versions. Source: wikimedia.org How probable is the hypothesis that ...
11
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1answer
5k views

Why is it said that the Tupolev Tu-144 had superior aerodynamics to the Concorde?

A quote from this article: "The Concorde had better range, braking and engine control but the Tupolev had vastly superior aerodynamics." What is the basis, if any, for this statement on the ...
6
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4answers
141 views

Why do carburetors tend to produce richer mixture at higher altitude?

The pressure drop in the venturi is proportional to air density and the fuel is at ambient pressure in the float chamber, so I would expect the fuel flow to reduce proportionally with density, and ...
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0answers
13 views

Yoke-Stabilizer Design Negligence [on hold]

Gentlemen, Thanks for your support with the 2 answers above. The Boeing 737-Max appears to be the first plane in aircraft history to have conditional pitch control (sometimes it works, sometimes it ...
3
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4answers
177 views

What changes are needed for a piston-prop aircraft to withstand saltwater environment?

I'm interested in WW2-era piston-prop aircraft. I want to know what changes are needed to make the aircraft withstand saltwater corrosion. Presumably these are different and more expensive than the ...
1
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2answers
101 views

Is the Meredith effect utilized in the cowling design of air-cooled engines?

The P-51 is famous for its advanced-for-its-time aerodynamics, the prime example of which is the radiator design under the belly which utilizes the Meredith effect to, in effect, turn it into a mini ...
1
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1answer
110 views

Who should design the nozzle of jet engines on aircraft?

There is a question in my mind that which company should design the nozzle of jet engine - the aircraft designer or the engine designer? If you watch this documentary: BBC Documentary Rolls Royce ...
5
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4answers
1k views

Can this design provide more lift force than thrust from engine?

The problem is depicted in the picture: Generally, why we don't use engine blow wings to fly? Can we use wind-tunnel-like wing to generate lift force? Can it generate more lift than thrust? If it ...
2
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0answers
73 views

If a twin-engine airplane's propellers both rotate in the same direction, do they still produce a left-turning tendency?

If an airplane with two propellers has both propellers with the same rotation direction (say, both the propellers rotate counter-clockwise as seen from nose to the tail), will be the four left-...
14
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1answer
901 views

What is this object on an MD-11?

There is something above the engine on the tail of this MD-11: What is that? Source
35
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4answers
23k views

Why was Concorde's cockpit so complex?

Source Why was this cockpit much more complex than any other modern day aircraft or a fighter jet? It looks to have many more buttons and controls, and very small (interesting) screens. Also, its ...
9
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1answer
2k views

Do rivets on airframe need special sealant to be airtight on pressurized airliners?

Do rivets on airframe need a dedicated sealant, e.g. epoxy, to be really airtight on a pressurized airliner, or is the expansion of the rivet shaft already sufficient? As a side note, how are carbon ...
5
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1answer
313 views

Why Western fighters' afterburner glow is reddish orange while Eastern Bloc fighters' is blue?

Recalling what little physics I know, this could be explained by two factors: The blue color is given by the characteristic EM radiation of C-H bond breaking, C- and H- radicals forming and ...
0
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1answer
50 views

What airfoil type is used on the B727-200F?

What airfoil type is used on the Boeing 727-200F? Is it a NACA profile or something else?
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0answers
42 views

How can I calculate the lift generated by a specific wing? [on hold]

What will be the amount of lift generated by a wing if it has a total surface area of 6m2 and it is moving with the velocity of 50km/h? And the airfoil has a flat bottom shape.
1
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1answer
80 views

What was the Airfoil of Handley Page P.115?

This extreme sweptback delta was built to test the Concorde wing at low speeds, sources say it had a biconv 6% airfoil, but I failed in finding data about it.
12
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2answers
2k views

Why does the Sukhoi-30 MKI have both canards and conventional horizontal stabilizers?

I believe the Sukhoi-30 actually has 3 means of altering pitch and roll - canards, horizontal stabilizers, and thrust vectoring. Image courtesy www.mars.slupsk.pl What is the point of this? Does it ...
29
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2answers
7k views

What is the purpose of the “Mirror-Thing” over the Mig-29 Cockpit?

I noticed that some Mig-29 Fighter Jets have a little mirror-like-thing over the cockpit. I can't imagine a possible usage from it (If it's really a mirror). Here's a picture from Wikipedia: As ...
24
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5answers
20k views

Could a pilot incapacitate other crew/passengers by manipulating cabin air quality/pressure?

Could a pilot of an airliner incapacitate everyone outside the cockpit by somehow triggering a loss of cabin pressure while simultaneously disarming the airplane's oxygen masks, manipulating the air ...
9
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1answer
168 views

How do flaps deploy and stow with very large wing flex?

On large airliners, the wings are generally of the high aspect ratio types and hence very flexible. Now the flaps are attached to wing only through a series of tracks, and as the wings flex, these ...
1
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1answer
115 views

Why is YF22 designed with conventional rudders while YF23 with all-moving rudders?

Are all-moving rudders more stealthy? If so, how come YF22 which is just as fixated with rear body stealthiness as the YF23 comes with conventional ones? Also, all-moving rudders have fixed camber, ...
0
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2answers
148 views

How do you use a flexible drive shaft?

Saw it on a 747 freighter nose door, see it again on an F16's M61A1 gun assembly. How do you design with a flexible shaft? In what situation do you use it to replace a bunch of rigid shafts and gears?...
0
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1answer
91 views

Fuel De-aerating Tank?

I know turbine engines (bearings) are cooled by oil jets and that when oil is scavenged from the bearings it is more of a mist than a liquid, hence the need for various types of de-aerating this mist ...
29
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3answers
24k views

Are fighter jets designed to be so inherently unstable that a human can't fly one unassisted?

I'm told that in order to be more maneuverable fighter jets are designed in a way that makes them impossible for a human to control without the help of a flight computer. Is this actually true? ...
17
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4answers
3k views

Would an aircraft with contra-rotating propellors longer than the plane's wingspan be able to fly?

I enjoy taking the time to try and visualize how fictional aircraft might actually work in reality. Unfortunately there are some that seem highly impractical from an engineering student's point of ...
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1answer
138 views

What percentage or airplanes have engines [closed]

I heard that some airplanes don't have engines. how many airplanes in the world have engines?
4
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3answers
231 views

Do large non-pressurized metal planes have a maximum fatigue cycle?

For example the DC3. The way I understand it, the only thing that "ages" the airframes of DC3 is the landing/takeoff cycles and the accompanied periodic force loading/unloading. Do planes such as this ...
4
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1answer
102 views

Can roll be controlled through elevators in a fixed-wing aircraft? [duplicate]

In fixed-wing aircraft, roll is typically controlled through ailerons. But I am wondering if roll could also be controlled through split, independently controllable left/right elevators?
8
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5answers
2k views

Why doesn't the A320 have a dorsal fin like the 737?

The A320 doesn't have a dorsal fin, but the 737 does. If the 737 is more or less a similar aircraft, why doesn't the A320 have a similar dorsal fin? By Bill Larkins [CC BY-SA 2.0], via Wikimedia ...
11
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3answers
380 views

Do fighter jets have deicing in their wings?

If there is such thing as deicing for fighters? If so, is bleed air or electric heating preferred? I could not imagine that a $50MLN fighter jet would not be able to get the ice off its wings.
51
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3answers
13k views

Could a Dyson fan scale up to be used as a bladeless aircraft engine?

Dyson has been making bladeless fans for a few years now that accelerate a consistent stream of air without exposed blades. If this concept were applied to aircraft engines, it could potentially ...
3
votes
1answer
206 views

Is the compressibility of air the reason high aspect ratio wings are more effecient

As stated many times here 1, 2, 3 wings generate lift by moving air downwards. This downward air creates an equal and opposite force pushing the aircraft up. High aspect ratio wings have a greater ...
1
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4answers
183 views

How is vertical speed managed in Airliners? [duplicate]

When an Airplane starts to take off, the Horizontal velocity would generate it the necessary lift, and then Airplane pitches up to further increase the lift. As the Airplane is climbing up, the net ...
10
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5answers
2k views

How has weight been reduced in commercial aircraft design and how will this trend continue?

Reducing weight of aircraft has become a priority as the aviation industry seeks greater fuel efficiency and commits to strict emissions targets. How much weight has been cut from single and twin ...
0
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4answers
166 views

How does Bernoulli's principle contribute in lifting airplane?

I have searched if any explanation that bind Bernoulli's principle in lifting airplane. There is one here which receive many appreciations, but still did not answer the question. So far, it was taught,...
0
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1answer
29 views

What to be considered in designing airplane tail (vertical and horizontal stabilizer, elevators and rudder)? [closed]

I would like to make a small amateur triplane with it maximum weight approximately 400 kgs with maximum speed 100 knots (180 kph). I have read many discussions about how to calculate the wing ...
26
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3answers
3k views

Why does the DC-10's horizontal stabilizer have such a pronounced dihedral?

If you look at this picture, you'll see that the horizontal stabilizer has a very pronounced dihedral in comparison to the wings. Could somebody explain in a simple way why? I understand that a ...
1
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0answers
54 views

Why does the Comet's horizontal stabilizer have so much dihedral?

The Comet's horizontal tail has a noticeably extreme amount of dihedral compared to that of, say, a 707: (Image by MilborneOne at Wikimedia Commons.) Note how the Comet's tail has about twice as ...
0
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4answers
134 views

Why some WWII fighters still have fabric/wood control surfaces?

I've heard people say that the reason US in WWII preferred designs with fabric control surfaces with either a metal or plywood frame is they can sustain some small arms fire without disintegrating. Is ...
19
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2answers
28k views

What are cowl flaps?

What are cowl flaps and what are they used for? It seems I have only heard of them in connection with old planes, are they peculiar to radial engines?
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2answers
186 views

Boeing 737-MAX Control System Design Flaw? [closed]

I’m concerned about Boeing aircraft safety design flaws because it is so disturbing to see so many lives lost in aircraft accidents. I’ve attempted to contact Boeing about this. But officially they ...
12
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8answers
5k views

What was the purpose of the “tail prop” on the Ilyushin Il-62 and why was it necessary?

I read somewhere that the Ilyushin Il-62 had a "tail prop". What was this device and why was it needed on this aircraft?
7
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2answers
308 views

What is the aerodynamic purpose of an Acorn?

This is an IL-62. On the tail of the aircraft, there is a large cone, protruding out of the vertical and horizontal stabilizer which is called acorn. I am trying to figure out what is the aerodynamic ...
1
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1answer
198 views

Boeing 737-MAX stabilizer control

Various websites have stated that during the 737-MAX crash in Indonesia, the pilots could not pitch up because of a faulty AOA sensor pitching plane down. Stabilizer has a rear fulcrum and front jack ...
1
vote
3answers
2k views

Could a plane with an electric turbine engine generate enough lift to provide a electric areodynamic lift and runway to space?

This question is similar to my previous ones but configuration is different and so is the question. Could a modified electric turbine engine (E-Fan) plane create enough of its own lift not to burden ...
3
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2answers
256 views

Can an Airbus A380 or Boeing B747 fly with only 2 engines?

If during cruising with full load, these two kinds of airplane got two of their engines failure: With one engines fails in each side (so, only one engine works every side). With 2 engines fail in one ...
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4answers
161 views

How does scaling of UAV size impact range?

Lets say you have two autonomous small aircraft, one with a wingspan of 200 cm and one with 400 cm. Both have the same general design. They are both optimized for travel distance on one full tank (gas ...
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1answer
283 views
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3answers
340 views

Is the MD-11's third engine slightly nose up?

From my visual inspection, the third engine (the engine on the horizontal stabilizer) is slightly "nose up", especially compared to the engines on the wing. That means, the front part of the engine is ...
4
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2answers
3k views

Why is the DC10/MD11 center engine placed where it is?

While reading this question about trijets I started wondering why the center engine in the DC10 and MD11 where placed where they are. Most trijets have the center engine at the very back of the ...