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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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88 views

How to deal with larger and larger engines [on hold]

What are possible solutions, if aircraft manufacturers can't fit ever larger turbofans onto the standard low-wing passenger jet configuration? Below, we see a 737 with large turbofans. If a new ...
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0answers
74 views

Dust and biofilm accumulation in pitot tubes [on hold]

Are extreme dust storms such as those described in past news stories in Cairo and Khartoum already addressed in pitot cleaning procedures for scheduled and unscheduled maintenance? For example: ...
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2answers
205 views

Why are fuel pump switches separate?

Since engines are run only when the fuel pumps are on and vice versa , why are there separate switches for this? Why can't it be automated ?
3
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1answer
183 views

Could the S.H.I.E.L.D. C-17 actually have a sensible center of gravity?

In a question about whether tail surfaces add to lift, I thought of a fictional example where the tail surface very much adds to lift: The Agents of S.H.I.E.L.D C-17, highly modified and super-engined....
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1answer
79 views

What is a shroud (in aviation terms or engineering terms)?

Please can someone explain what a shroud is and give examples of types of shrouds and their uses on aircraft?
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5answers
6k views

Why do passenger jet manufacturers design their planes with stall prevention systems?

I understand why passenger jets use software that overrides pilot inputs that might cause the jet to exceed the flight envelope. But why do passenger jet manufacturers design their planes with stall ...
2
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1answer
263 views

Is there less vertical space for an engine under the wing of a 737 Max than for an A320neo?

The source of this question is the understanding that the LEAP-1B couldn't fit under the wing of a 737 without changing its longitudinal position. But this wasn't the case with the design of the LEAP-...
-1
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1answer
257 views

Why is Boeing being blamed for the recent 737 Max crashes? [closed]

Boeing has received more than 5,000 orders for the aircraft, it has delivered 350 so far and only 2 of them have crashed. That's not a very high crash rate. The FAA, until just a day ago, was very ...
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3answers
63 views

Load factor and how does velocity affect it?

An aircraft initially flying level with a velocity of 130 m/s pulls into: a turn of radius 300m at constant altitude (i.e. a horizontal circle) with constant velocity; a loop (i.e. a ...
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4answers
462 views

Could a C-130 Hercules be built using WW2 technology?

I'm looking at this as a "time traveller carrying only designs in his head" scenario. Obviously turboprop engines are out of the question, but how close in capability would it be possible to get a C-...
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3answers
193 views

Why Buy A C182/172 Instead Of An C180/170? [closed]

So a thought came to my mind which covers not only Cessna planes but all others. The Taildraggers need a little bit less runway becayse AOA on takeoff is good and that AOA eliminates the need of ...
19
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4answers
8k views

Why are special aircraft used for the carriers in the United States Navy?

Why are aircraft such as the legacy F-14 and now the F/A-18 used by the US Navy carriers? It seems to me that developing a new aircraft from the ground up is very expensive. Is it not possible to ...
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3answers
126 views

How to determine angle of bank caused by shift in centre of gravity in an aircraft?

I’m trying to figure out the angle of a bank caused by a shift in the centre of gravity of an aircraft. How should I do this? What avenues should I go down to calculate this? I know that the plane ...
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2answers
225 views

Why do the B747 of NASA Shuttle Carrier Aircrafts (SCAs) need additional vertical stabilizer?

Here is picture of B747 SCA of NASA and the AN-225 SCA. There are additional vertical stabilizer in the tip of the elevator to the Boeing's, while the AN-225 is designed with the vertical stabilizer ...
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1answer
87 views

How to stabilize the aircraft flight after dropping boosters? [closed]

I want to make aircraft model with boosters, but i don't know how to stabilize it. Аfter dropping the boosters, the center of mass of the aircraft will change, and I would also like to know whether it ...
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0answers
53 views

Source and Impacts of cracks on window pane? [duplicate]

Today, I spotted cracks on the outer window panes, of my aircraft, VT-GWH, a 11 year old A320. The cracks were present on every window pane that I could see. On simple observation, I found that the ...
12
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4answers
2k views

Why does the DC-9-80 have this cusp in its fuselage?

The fuselage of the McDonnell Douglas DC-9-80 (marketed as the "MD-80") has a pronounced cusp at floor level, as can be seen in this diagram (courtesy of Boeing, eater of McDonnell Douglas - at least, ...
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0answers
23 views

What is the relationship between the Center of Pressure and flap deployment?

I have been reading regarding the Center of Pressure of an airfoil (Cp) and the relationship with angle of attack. What is a good way to explain in layman's terms why the pressure changes in such a ...
3
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2answers
157 views

What prevents aircraft with a tailcone APU from using tail-mounted airbrakes?

The BAe 146 and Fokker F-28, which are virtually alone among jetliners in lacking thrust reversers, compensate by using large, tail-mounted airbrakes to help slow the aircraft during descent and ...
3
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2answers
82 views

Certification of Aircraft Phone/Tablet Mounts/Holders

I would like to know, whether it is required for such items to be certified for application on genaral and/or commercial aircraft: https://www.rammount.com/part/RAM-B-166-MP1U https://mgfproducts....
2
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5answers
233 views

Was the adoption of conventional tailplanes as 'everyday aircraft' inevitable, or are there other designs that can be just as good?

I originally asked a variant of this on Worldbuilding.SE, but they didn't seem to like it. So I apologize if it's out of place even here. I ask, because I've been forming in my head an alternate ...
3
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2answers
146 views

What is the weight of the fuselage (only) of the Boeing 747?

I'm wondering about the weight of the Boeing 747's fuselage.
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3answers
3k views

How does a single engine tail wheel landing gear airplane turn when it is on the ground?

Say Cessna 140 as in this video, look like no additional device to make it turnable when it on the ground. It is a single engine and a tail wheel landing gear. Then, how does it turn?
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2answers
88 views

Which one is more effective produce power of this two turbine's location?

Consider we have the exactly same turbine which is possible to be mounted to the tail (left picture) and to the wing (right picture) as picture below. Which one will produce more power to the airplane?...
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2answers
210 views

Why was the DC-8-70 successful, but not the 707-700?

The first high-bypass turbofan small enough to use on a narrowbody jetliner was the GE/SNECMA CFM56, which entered service in the late 1970s as an upgrade engine for the KC-135 tanker; Boeing almost ...
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3answers
220 views

Is it possible to convert a passenger A380 to carry cargo?

I heard an expert say that one of the A380's weaknesses is that it only comes in a passenger version, not a cargo one like the B747 does. The cargo version of the B747 makes its market wider. One more ...
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1answer
124 views

How to understand the kinematics principle behind landing gear retraction system (or 4 bars system)? [closed]

I would like to know about the principles of landing gear retraction system and I struggle to find clear information about it. It seems to be about a four bar systems in most cases but I would like ...
3
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2answers
268 views

Why don't nose landing gears have brakes?

Nose brakes can help the aircraft in braking and it can also help in reducing the travel on the runway length. So why don't we use brakes in the nose landing gear?
2
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1answer
135 views

Can the real time operating system used in aviation equipment be certified by itself?

Can the real time operating system used in aviation equipment be certified by itself, or must it be a part of some software certification effort? I'm asking for getting a certificate of 178C. I don't ...
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2answers
142 views

Would this hybrid impeller design create enough thrust for a VTOL aircraft?

I am wondering if combining a centrifugal blower impeller with an Archimedes screw impeller would create a hybrid impeller that would create enough thrust to lift up a VTOL aircraft. Please reference ...
1
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1answer
216 views

Since when had fighter jet designer stopped caring about Whitcomb's Area Rule?

According to this source, designers of military fighter jets seemed to have stopped centering their design on Whitcomb's Area Rule for quite a while. Yet even the twin series fighters struggle to ...
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4answers
2k views

What are some drawbacks to having a wingtip propeller on an aircraft?

I was reading about aircraft concepts that involved wingtip propeller design and was wondering what the drawbacks of such a technology would be. I could not access the full paper but came across this: ...
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0answers
58 views

How to calculate the power required during transition from VTOL to fixed wing?

In a VTOL, I have calculated the power required for take off and cruise which was not difficult at all. Between take off and cruise, there is a phase where the VTOL has to transition by tilting the ...
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0answers
69 views

In a Boeing 767, what percentage of the aluminum is in structural components?

For a Boeing 767 (model year 2000), does anyone know how much aluminum is in 'structural' components, as a percentage of the total amount? And specifically the wings?
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4answers
77 views

Would a propeller extracting air from a cylinder with holes in it be an ideal lift apparatus for a VTOL aircraft?

I am wondering if enough lift can be created for a VTOL aircraft using a propeller that is extracting air from a cylinder which is closed at one end and has holes in the top half of the cylinder. ...
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2answers
253 views

Is it common for panels on a plane's body to not be perfectly aligned?

I was recently on a RyanAir flight. As far as I know, they use Boeing 737. When boarding, I noticed a that one of the panels' edge, roughly where the head / chest part of the logo is, was sticking ...
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2answers
160 views

What is the procedure to turn an airplane when it flying? [duplicate]

As far as I know, there are two part devices that involved when turning an airplane when it flying: aileron and rudder. How they work? Which one is first over another when turning/banking? In this ...
17
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3answers
6k views

How does the F-35B not flip over during transition?

As the engine nozzle rotates, the lift-fan cannot. Wouldn't this imbalance of moments around the center of gravity result in the F-35 pitching up onto its back? As can be seen at 5:14 in this video: ...
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2answers
9k views

Do all aircraft carry depleted uranium as counterweights?

I was told that most aircraft had depleted uranium on board as counterweights. I have not seen one myself. Do all current modern aircraft have depleted uranium on board?
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1answer
69 views

Gas Turbine engine inlet [closed]

I understand that the turbine of the engine runs the compressor and the fan of the engine. If the air flows through the compressor undisturbed, can we avoid having an inlet in the gas turbine engine ...
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1answer
177 views

How do dry bays protect against fire?

How do dry bays protect against fire, and do civil aircraft also have dry bays like military aircraft?
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3answers
219 views

Is there a practical carbon-free jet fuel?

For example, when I want to use a small turbojet or low bypass turbofan as both the APU and bleed air supplier for blown flaps, ailerons, elevators, (like the ShinMaywa US-2 amphibious plane) and ...
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3answers
98 views

Can we change light aircraft skin from aluminum to foam and fiberglass? [closed]

Can we change the skin and wings of light aircraft from aluminum to foam and fiberglass composite in zenith ch 750 ?
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2answers
79 views

How are these parameters derived from readings of sensors in an aircraft: angle of attack, slip angle, and airspeed?

From what I've learned, the reading comes from an angle of attack sensor and a slip angle sensor. Let's call the readings $\hat\alpha$ and $\hat\beta$ respectively. These are of either the ...
3
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1answer
151 views

Which one needs longer runway of an airplane between take off and landing for a constant weight?

Consider we have an airplane that the weight will be constant when take off and landing (in fact will be no such common airplane right now as the fuel will be less due to engine consumption. But in an ...
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1answer
147 views

How did shortening the 707 increase its range?

According to the Wikipedia entry for the 707-120: The 707-138 was a −120 with a fuselage 10 ft (3.0 m) shorter than the others, with 5 ft (1.5 m) (three frames) removed ahead and behind the wing, ...
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1answer
181 views

Why are all-moving horizontal stabilizers common but all-moving rudders rare on fighters?

According to Wikipedia Stabilators were developed to achieve adequate pitch control in supersonic flight, and are almost universal on modern military combat aircraft. All non-delta-winged ...
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3answers
454 views

Why does the B-52 have such a tiny rudder?

The B-52 (aka Stratofortress, aka Grey Lady, aka BUFF) has a minuscule rudder for an aircraft of its size and wing-mounted engine placement: Compare to, for instance, the rudder on a 747: The B-52’s ...
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2answers
161 views

What are the issues involved in converting a quadjet into a twinjet?

As you are probably all aware already, the fewer engines you have, the better your fuel efficiency; that’s why the airlines are selling off their (quadjet) 747s and buying (twinjet) 777s, why they’ve ...
3
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1answer
128 views

Why weren’t the Comet’s overhead ADF windows roundified along with its passenger windows?

Following the crashes of two Comet 1s in early 1954 due to metal fatigue, all future Comets (and the few surviving Comet 1s that were rebuilt rather than scrapped, all of them in military service) ...