Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Aircraft Design describes the different choices that aircraft designers (typically aerospace engineers) make to create an aircraft.

1
vote
0answers
24 views

Is there any fixed-wing UAV common research model available?

Is there any source of structural specifications data available for a particular fixed-wing UAV, that can be used for comparison with a resulting structure, obtained by a structural optimization ...
0
votes
0answers
26 views

Super critical aerofoil advantages [on hold]

Advantages of Supercritical aerofoil?
9
votes
3answers
362 views

Why is the A380 a double-decker rather than a longer airplane?

It seems like making the A380 a double-decker increases the cross-sectional area of the fuselage, thereby increasing drag on the airplane. Wouldn't it be more efficient to fit so many seats in a ...
1
vote
3answers
193 views

Can an APU be designed to also provide emergency thrust in the event of a double engine failure?

Commercial airliners seem to be moving towards twin jets with incredibly powerful 100,000+ lb thrust engines becoming available for use. Would it be possible to design the APU to provide enough ...
1
vote
1answer
60 views

Where is the wing sweep angle measured from?

If you look at a 747 planform wing you see something like this: In several aerodynamics and aircraft design text books they use the wing sweep angle as an important parameter to measure the wing ...
0
votes
0answers
58 views

How to design an aerodynamic trim tab? [closed]

I’m working on horizontal tail for a Level-1 category-B aircraft in a master project. I’ve searched some articles but couldn’t find proper instructions except M. H. Sadraey’s Aircraft Design. What’re ...
-1
votes
1answer
177 views

how many blades are required for an helicopter? [closed]

Out of curiosity, I would like to know whether it is easy to build one flyable helicopter. If yes, what should be the size of the main rotor and tail rotor, if the overall weight is around 300 Kg? ...
0
votes
2answers
101 views

Do stall strips mean that wing washout is not required?

The Wikipedia page on stall strips states that AA-1 Yankee airplanes used stall strips to avoid tip stalls (and spins) because wing washout couldn't be used. So my question is: can two stall strips ...
0
votes
0answers
62 views

What‘s the diameter of the engines of the Airbus E-Fan?

does somebody know the diameter of the E-Fan‘s engines ? To me the look like around 80cm or what do you think ? Also, with more and wider blades and 60 kW motors instead of 30 couldn‘t they get much ...
18
votes
3answers
386 views

How many parts does the latest-generation 737 share with the original 737?

There is an old paradox which states that if a boat sails round the world replacing worn out parts as it goes, once it has replaced all of itself is it still the same boat? I choose the 737 because ...
0
votes
1answer
51 views

How do the vortices affect the flow of the horizontal stabilizer upon leaving the wing?

Other than the downwash effect, what other factors that affect the flow to the horizontal stabilizer? such as Dynamic Pressure? Air Flow Disturbance?
51
votes
3answers
12k views

Why does this 757 have a propeller engine attached to the fuselage?

I saw the following photo of a Honeywell Aviation Services Boeing 757-225: If it's not a fake, the airplane has a propeller mounted on a pylon on one side. What's the purpose of such strange design? ...
1
vote
1answer
90 views

How to determine the direction of rotation of components inside a gas turbine engine using the blade profile?

I am new to Gas turbine Engines. As of now,I am trying to understand the gas turbine engine DGEN 380 by the manufacturer Price Induction. So I have identified the components such as Intake fan,...
5
votes
1answer
173 views

Why are many early gliders high-wing designs as opposed to newer designs?

Many early gliders were designed with a high-wing configuration. An example of this is the K 8, but many more of the same and previous generations follow this configuration. Later generations (e.g., ...
0
votes
1answer
294 views

What will happen if an X shape wings mounted on biplane?

The question is What will happen if an X shape wings mounted on a light biplane? What will happen in the place which upper wings come closer to lower wing?
1
vote
2answers
79 views

Where can I find the best site to learn aircraft design on a small scale? [closed]

I am undergraduate student still trying to figure out a lot about Aerodynamics and aircraft design. I am learning how to design rc planes. So the thing I know the weight of my plane which is between ...
1
vote
0answers
43 views

What is the formula to calculate lift in a bi plane? [closed]

I am designing a radio controlled biplane and was wondering what would be the change in the conventional formula for calculating the lift . So I have chosen the airfoil, sd7062 and have the cl value....
0
votes
0answers
27 views

Where to find information on weight breakdown for helicopters?

I would be interested in information on the weight breakdown for the different components of a helicopter. How much of the maximum gross weight is related to the airframe, engine, gearboxes, ...
2
votes
1answer
151 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
vote
1answer
121 views

By what scale is Latitude and longitude calculated on aircrafts? [closed]

If we travel by 1 metre on any side how much of longitude and latitude changes? Since the flight is travelling so fast latitude and longitude changes quickly so how do they calibrate it? PS:Is there ...
-1
votes
1answer
56 views

How do I decide the tail dimensions and the distance between the wings for a bi plane? [closed]

So I am designing a biplane,I know the weight.I want to know what is the lift formula , volume ratio and aspect ratio for a biplane? I know the formulas for monoplane
3
votes
0answers
130 views

How do you calculate the lift coefficient of an airfoil at zero angle of attack?

Thin airfoil theory gives $C = C_o + 2\pi\alpha$, where $C_o$ is the lift coefficient at $\alpha = 0$. However, I couldn't find any equation to calculate what $C_o$ is which must be some function of ...
19
votes
2answers
6k views

Tail Wing Dented—Is it safe to fly?

I’m sitting in the lounge waiting to board this flight. Saw a dent in the attachment of tail wing to the body. Is this common? Also I could be wrong and it is part of the design of the airplane. Any ...
7
votes
1answer
252 views

What factors govern the placement of a helicopter's tail rotor (left or right)?

An image search for 'helicopter' indicates that there isn't a consensus on whether to place the tail rotor to the left or the right of the tail boom, although I'm believe there may be a bias for left. ...
1
vote
1answer
55 views

How (or where) do I find an airfoil optimized for low reynolds numbers (100,000~150,000)?

Looking to build a RC plane. Because the span is going to be small and the speed relatively low, I estimate the R-number to be around 100,000. Is there an airfoil optimized for that range of Reynold's ...
0
votes
2answers
93 views

aircraft display Processors

what kind of Processors and GPU are used for Aircraft display ? Is it possible to use single processor to run all three displays (Primary flight display, Navigation display and EICAS)?
1
vote
1answer
146 views

How much thrust could a 400 mm EDF produce?

there's a 195mm EDF from Schübeler that produces 25 kg of thrust at a peak power consumption of 15 kW: https://www.schuebeler-jets.de/de/produkte/hst Now, my question is: How much thrust could you ...
11
votes
1answer
611 views

Are there any standards on the dimensions of PFD symbols?

Are there industry standards on dimensions of PFD symbologies like heading, airspeed and altitude? I want to design a 15 inch screen and wonder if there are any standards or regulations regarding the ...
2
votes
3answers
164 views

Do high-wingers have dihedral?

I know that high wingers have an inherent dihedral effect. Are there any examples of high wing aircrafts with a dihedral? If so, what is the reason behind it?
1
vote
1answer
70 views

How does washout affect the wing incidence required?

In theory: if I wanted to build an model aircraft with (zero zero) wing/tail incidence, how would washout affect the root incidence required? E.g. if a wing has 2 degrees washout at the tip, would ...
0
votes
1answer
75 views

Why are cambered airfoils used for horizontal stabilizers in some designs?

From what I know, usually NACA9/12 or similar symmetrical airfoils are used for the tail. Still some aircrafts use highly cambered airfoils for elevators. What are some advantages and disadvantages ...
1
vote
4answers
215 views

What is the total wing surface area of the A320?

I was trying to calculate the total area of an A320, and in this link I found the wing area and tail area. But here I read that the wing area is just the 2D projection of the wing. So if I wanted to ...
0
votes
1answer
132 views

How do you maximize an electric engines thrust?

I‘ve been recently looking for answers to this question on the internet but the jungle of propellers, fans and electric motors didn‘t quite get me an anwer. How would I have to design an electric ...
6
votes
3answers
383 views

Why do the C-141 and C-5 have T-tails?

Both the C-141 Starlifter and C-5 Galaxy have T-tails, where the horizontal stabilizers and elevators are mounted on top of the vertical fin rather than on the sides of the aft fuselage. T-tails are ...
0
votes
1answer
150 views

Are same-era military aircraft cockpits designed to be familiar to transitioning pilots?

The wonderful SR-71 ha what looks to me an intimidating cockpit: However, lots of planes of that era have ostensibly-similar cockpits to the layman, take this F-5 for instance: I choose the F-5 as ...
1
vote
0answers
32 views

What happens to the neutral point of a fighter jet during supersonic flight? [duplicate]

I understand that for a fighter aircraft, it would have to be inherently unstable. To do this I believe that the neutral point needs to be aft of the cg. I was told that during supersonic flight this ...
3
votes
1answer
124 views

Definition of a Deep Stall

I've been doing some research for a uni assignment and I noticed that the RQ-11B uses a "deep stall landing" to get back onto the ground. What I don't understand though is how this aircraft gets into ...
7
votes
3answers
1k views

Have bi-wings been used without creating more drag?

As I understand from answers I've read here 1, 2, 3, biplanes create more lift with less wing span when compared to single wing aircraft, because the combined wings have greater surface area overall. ...
3
votes
0answers
118 views

Can be the divergence Mach be greater than 1?

I am wondering if this is possible. I know that by decreasing t/c and increasing the sweep angle it is possible to increase the divergence Mach. Where is the limit? I am calculating the Mach for a ...
3
votes
1answer
98 views

Why does operating the rudders in the engine slipstream offer improved rudder authority at low speed?

The above question is usually presented as an advantage for H-tail configurations. How does it help?
15
votes
1answer
2k views

Are there any aircraft with powered landing gear?

My student asked me a question this morning. It was: A car drives by turning its wheels against the Earth. An airplane taxis by rolling on its wheels while the engines push against the air. Are ...
8
votes
2answers
300 views

Would putting several small propellers on a wing be efficient?

I saw this video that NASA posted, which presents the idea of putting several small propellers on a wing: They claim that by doing this you can force air to blow over the wing more quickly. This ...
1
vote
2answers
263 views

What is the 'end plate' effect?

When talking about T-tail configuration, I don't understand the statement that, "The vertical tail can be shorter due to the end plate effect of the horizontal tail." What exactly is the endplate ...
2
votes
2answers
81 views

How would gyroscopic effects affect push-pull configuration vs conventional twin engine in the event of engine failure?

This answer, and the Wikipedia article on push-pull configuration both claim that aircraft with push-pull configuration are easier to fly in the event of engine failure, because the thrust provided by ...
0
votes
1answer
53 views

Why are the positive points in a V-n diagram associated with pitch maneuvers?

For an aircraft with such flight envelope, the flight conditions in point A, C and D are ...
1
vote
0answers
141 views

Will leaving the ducting on the propellers attached to a DIY aircraft give it more thrust? [duplicate]

I'm not sure if its the right place, I have a problem with a flying thingy, and you like flying thingies, don't you? I will be trying to add some means of propulsion to my friend's styrofoam plane (...
6
votes
1answer
348 views

Are pressurized passenger aircraft usually completely airtight?

Various sources on the internet indicate that the passenger cabins on pressurised airplanes are not 100% airtight. I'm not talking about ventilation/pressure valves/cabin pressurisation system, but ...
0
votes
2answers
180 views

Is it possible to power a very small jet using batteries? [duplicate]

I have read a lot of answers on batteries powering large commercial jets, and how it won't work. However, for a small jet like the Honda jet, would it be possible for it to be powered completely by ...
0
votes
1answer
67 views

How to determine the maximum servo torque required for a nose gear?

It's pretty much it. I know how to calculate the friction force on the nose gear for a three-point landing condition using the method set forth in ...
46
votes
2answers
11k 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 ...