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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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Will we ever see unconventional airplane configurations in operation? Will they completely replace the normal tube and wing design? [closed]

I have recently been looking into novel airplane configurations such as the blended wing body, transonic truss-braced wing, and box wing proposed by many aerospace companies like Boeing and NASA (...
E. Chao's user avatar
  • 11
1 vote
0 answers
87 views

RC Airplane Questions [migrated]

I'm making a RC Airplane using Sunboard and Cardboard. The wing is about 80cm long, with a wing profile looking like I also connected a A2212 1000kv Brushless motor with a 10x4.5 Inch Propeller. To ...
S.A's user avatar
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6 votes
5 answers
3k views

Why aren’t there Seaplane AWACS?

Why are there no seaplane AWACS? AWACS aircraft are excellent force multipliers, with their detection and networking capabilities. Due to their altitude, they can allow a naval force to “see” beyond ...
User2334's user avatar
6 votes
2 answers
271 views

Why aren't there any larger autogyros/gyrocopters?

Simply put, all the information I've found about autogyros/gyrocopters has been about very small single-engine sport aircraft that can carry the pilot and maybe one passenger. Why aren't there any ...
nick012000's user avatar
1 vote
2 answers
210 views

What are the little bulges on the tail of an F-18 for?

I noticed on this photo of an F-18 from Wikipedia that the tail of this F-18 Super Hornet has multiple small bulges on it and I was wondering if anyone knows what the purpose of those bulges are?
Jordan Stephan's user avatar
1 vote
1 answer
109 views

Are rectangular fuselages more sensitive to winds than circular ones?

If you have an aircraft like the DHC6 twin otter or the SkyCourier (picture bellow which have a rectangular shape like fuselage) and then you have another aircraft with the exact same dimensions and ...
Gabe's user avatar
  • 3,217
-5 votes
1 answer
180 views

Why use the F-35

The F-35B has been troubled by "problems with its stealth coating, sustained supersonic flight, helmet-mounted display, excessive vibration from its cannon, and even vulnerability to being hit by ...
VFA-34's user avatar
  • 119
0 votes
0 answers
30 views

How do you compute the net lift force location?

There are a lot of formula that give an approximate solution to the lift and drag forces associated with certain wing configurations. What I'm curious about is how do you find where the net force is ...
FourierFlux's user avatar
0 votes
1 answer
151 views

Why does F-18 have low wing sweep?

Compared to most other fighters, the f-18 has a low sweep angle on its wing; 20 degrees compared to the f-16s 40 degree sweep and f-15s 45 degree sweep. Additionally the wing has a relatively high ...
User2334's user avatar
2 votes
1 answer
163 views

Is it a good idea to increase exhaust duct length?

I am a big newbie in aviation but still, I have a question: Let's assume a civil aircraft (Boeing 737 or Airbus 320), flying with those impossible real life hypothesis: the exact SAME turbofan are ...
user12642493's user avatar
0 votes
3 answers
123 views

How do I choose Cl during cruise flight with a given MTOM and variable S?

Currently I'm challenging myself to build an airplane from scratch. I have a background in aeronautical engineering but I have no experience in actually designing an aircraft from the ground up. (FYI: ...
eckh_ma's user avatar
  • 11
0 votes
1 answer
60 views

How I determine numerically the pitch rate of an aircraft?

I have done aerodynamic analysis on a UAV. Is it possible to calculate pitch rate and yaw rate of my UAV depending on design parameters? (I have aerodynamic analysis of the wing, CL, CD, MAC, W, etc.)
A K's user avatar
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1 vote
1 answer
81 views

Would laminar flow airfoils work for a canard aircraft?

The L/D benefits of laminar airfoils seem hard to pass if flying within their Reynolds number. But what would happen if you used them for canard aircraft? Could they be used on an aircraft like the ...
Josh Carr's user avatar
0 votes
3 answers
70 views

Lift distribution of a swept wing with twist, dihedral, taper

I am trying to get the lift distribution of a swept wing with taper (in chord and thickness along the span), twist, and dihedral. I know that Kuchemann Index method is used for swept wings but I am ...
RNG's user avatar
  • 477
23 votes
1 answer
3k views

Does a carbon fiber fuselage suffer wear from pressurization/depressurization?

I've heard many times that one of the factors that causes wear and tear to the fuselage of airliners is the pressurization and depressurization from each flight. From what I recall these were ...
Gabe's user avatar
  • 3,217
-1 votes
1 answer
101 views

How does a glider in steady descent glide with negative AoA? [closed]

EDIT: I now understand relative wind is parallel to the travel of the glider. Ignorance was the basis of my earlier confusion. I looked at some toy and commercial gliders and all of their wings were ...
Charles Nicholson's user avatar
2 votes
1 answer
310 views

Flying using less fuel in one tank

Can flying using fuel from one and not the other tank save fuel from constant cross winds over long flights or make it easier to land? Is there anytime where having the ability to shift the weight of ...
Justintimeforfun's user avatar
0 votes
3 answers
136 views

VTOL Propeller Sizing and Executing a transition from VTOL to Forward Flight mission profile

Hi I am an engineering student, currently in the process of designing a compound UAV drone capable of both vertical and forward flight. I've made significant progress, having completed initial gross ...
AeroBoi's user avatar
0 votes
1 answer
182 views

Does the B52 stratofortress nose wheel lock during takeoff and landing?

I wonder if the B52 nose wheel is still moving while takeoff and landing. Does it?
A-Jhay08's user avatar
1 vote
1 answer
232 views

Most Efficient Commercial Aircraft Design? [closed]

What was the most efficient aircraft design (based on factors such as lift, drag, and fuel consumption) but not developed or scrapped due to issues with long term viability and maintenance, operations ...
Gokul Nath KP's user avatar
11 votes
4 answers
8k views

Why don't Airbus planes have perfectly smooth front sections?

From time to time I like to watch a planespotting video and I must say that one tiny detail bothers me a slight bit. Look at this Boeing plane: And at this Airbus: In particular, examine the section ...
scrrr's user avatar
  • 219
2 votes
1 answer
184 views

Why were the external stores pylons on the F/A-18E/F Super Hornet canted outward?

It is very visible in the picture above that the external stores and pylons to mount them on F-18 Super Hornets are canted outward. I do not believe the legacy Hornets had their pylons mounted this ...
Romeo_4808N's user avatar
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2 votes
2 answers
122 views

Where can I get blueprints of older aircraft?

I'm currently working on a project for an internship that involves modifying a 1959 Cessna 150. I won't actually be modifying a Cessna 150, but it's more of a "if you did modify it here's how you ...
Cade Miller's user avatar
6 votes
3 answers
3k views

Why aren’t flaperons seen on many aircraft?

Why aren’t flaperons common? In theory, they seem like a great idea. I know some planes like the 777 have them, but they’re very small in comparison to the normal flaps. It would make sense to ...
Wyatt's user avatar
  • 2,405
10 votes
4 answers
2k views

How to scale the weight of a RC model aircraft?

How to scale the weight of a RC model aircraft? If the scale of an model aircraft is 1/4, what should the scaled weight be?
Fred's user avatar
  • 1,243
8 votes
1 answer
2k views

Visually see flap settings from passenger window behind wing

I've flown on a lot of Airbus and seen a lot of trip reports on YT and wonder if you can visually see the different flap settings (if you are seated at a window behind the wing), for example Up, Flap ...
DilKent's user avatar
  • 81
3 votes
1 answer
167 views

Is the math behind my approach to design a propeller right?

I'm trying to design a fixed pitch propeller of diameter 1.8 m flying at 10000 ft going at forward velocity(85 m/s). What I've done is take a series of airfoils (from root to tip), found the ...
vaishnavi gowrishankar's user avatar
0 votes
0 answers
54 views

How can I cross verify my propeller thrust? [duplicate]

I'm simulating a propeller in Ansys and im getting a thrust of 2000N. The forward speed is 85m/s and 240.25 rad/s angular velocity and the diameter of the propeller is 1.8m. Since I'm not able to find ...
vaishnavi gowrishankar's user avatar
6 votes
0 answers
124 views

What older regulations and exemptions does Boeing's 737 line benefit from?

Boeing is occasionally accused in the press of keeping the 737 competitive by being able to avoid newer regulations and standards, either through being previously certified or by other means. The ...
Therac's user avatar
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1 vote
3 answers
149 views

Could an air-breathing electric propulsion (ABEP) or other form of ion propelled aircraft fly on Mars?

I'm currently in a class for aircraft propulsion and I became interested in Ion propulsion. It seems there hasn't been many developments for a few years as far as viable aircraft utilizing the ...
thewanderingsophist's user avatar
0 votes
1 answer
71 views

Can a single-bladed rotor with cyclically varying torque emulate a swashplate?

Instead of a swash-plate cyclically varying the pitch of the rotor blade(s), could a similar effect be generated by cyclically varying the thrust of the motor on a fixed-pitch single-blade rotor? The ...
Albeit's user avatar
  • 103
1 vote
2 answers
187 views

Why was the cone inlet design abandoned for supersonic aircraft?

The cone inlet design can be seen on the F-104 Starfighter and the SR71 Blackbird which were both Kelly Johnson projects. Also on the F1 mirage, Mig21, and so. I understand that they were used to ...
Zeus's user avatar
  • 13
0 votes
0 answers
32 views

What are the differences between an oblique wing and a swing wing? [duplicate]

How they differ from each other. How do they work. What is the structural differences. How do they help in reaching mach speeds and get better fuel efficiency. How does they both perform with max ...
Naveen's user avatar
  • 1
0 votes
1 answer
109 views

What types of aircraft can TS-1 fuel be used for?

I'm curious to learn about what types of military aircraft can take TS-1 fuel. For example, can a SU-30 or a YAK-130 use TS-1, or do they only take A-1? Also what types of helicopters can take TS-1? ...
Sarah Marks's user avatar
0 votes
1 answer
93 views

Does adding twist to wing always decrease induced drag and what are its effect on parasite drag? [duplicate]

I am doing an assignment and one question was the effect of twist on drag. The first two options are increased induced drag and decreased induced drag respectively. The third option is increased ...
POTATO MAN123's user avatar
0 votes
0 answers
98 views

Has a supersonic airplane with a truss-braced wing been studied/developed?

The X-66 truss braced jet is to be transonic. But have any published studies or development programs been done for a supersonic equivalent? Seems like someone considered it, given that it allows ...
Abdullah is not an Amalekite's user avatar
1 vote
0 answers
42 views

How much of the Virgin GlobalFlyer's L/D is due to laminar flow?

Despite travelling much faster than the Voyager, it has a significantly higher L/D. The latter seems to have two features that disrupt laminate flow, that are absent in the former. Namely the canards ...
Abdullah is not an Amalekite's user avatar
2 votes
2 answers
380 views

What are the techniques that delay the formation of shock wave over wing?

In addition to winglets and other techniques like sweeping wing back what are the other techniques that delay the formation of local shock wave over the wing?
Ambarish Deshpande's user avatar
0 votes
2 answers
173 views

What is the relationship between the wingspan and the electrical power of the DC motor? [closed]

I'm working with a cargo plane and I'm trying to find out if it's more efficient to work with more wingspan or more engine power. For example, having a variation of 300 mm (I have a model airplane), ...
MAGDO JOSE DE OLIVEIRA FILHO's user avatar
3 votes
1 answer
167 views

Could ballonets be used in rigid airships

Ballonets are used to maintain the shape of non-rigid airships, and as buoyancy compensation. Could ballonets also be used for buoyancy compensation in a rigid airship? I'm wondering if a ballonet ...
James Anderson's user avatar
3 votes
2 answers
230 views

Horizontal oval windows in Cessna aircraft

Is there a reason (except aesthetics) behind the horizontal oval form of the windows of some private jet/small aircraft? As far as I'm aware this shape should be rather counterproductive. According to ...
VRK's user avatar
  • 353
4 votes
1 answer
293 views

How do size and speed affect sonic boom strength?

The Boeing 2707 SST program of the 1960's was very ambitious, aiming for 300 passenger aircraft flying at speeds of Mach 2.5 to 3. The similarly sized XB-70 was test flown supersonicly along a ...
Robert DiGiovanni's user avatar
0 votes
2 answers
212 views

Why is the Busemann biplane not used?

A Busemann biplane greatly reduces wave drag It would allow a deeper, more efficient structure to support a wing with less wetted area and thus friction drag. It would seem trivial to tilt the ...
Abdullah is not an Amalekite's user avatar
6 votes
2 answers
647 views

How do canards reduce the X-59's sonic boom?

X-59 As of 2017, the ground noise was expected to be around 60 dB(A), about 1/1000 as loud as current supersonic aircraft. This was to be achieved by using a long, narrow airframe and canards to keep ...
Abdullah is not an Amalekite's user avatar
17 votes
3 answers
10k views

Do fighter jets have windshield wipers?

I was wondering if fighter jets do have windshield wipers for the rain. Other airplanes do. I can imagine that you don't need them because of their speed but I wasn't able to find some clear ...
Quinten's user avatar
  • 1,158
2 votes
3 answers
624 views

Why weren't WWII piston aircraft able to fly at 500mph?

So, I just noticed that typical WWII piston engine fighter aircraft had a power to weight ratio of around 300W/kg, even at gross weight and altitude. This means that if we assume that an aircraft has ...
Abdullah is not an Amalekite's user avatar
0 votes
5 answers
312 views

How/why does engine torque and horsepower affect aircraft speed? [duplicate]

I'm curious as to why torque and horsepower affect an aircraft's speed. AFAIK, it's only the engines RPM that affect speed, right? Does this mean an engine's torque/horsepower only affects the speed ...
aleks lacroix's user avatar
6 votes
3 answers
4k views

Why does the F/A-18 have so many lift supplementing devices?

Leading edge devices, normal flaps, dog teeth, strakes. Why does the F/A-18 have so many lift assisting devices?
Wyatt's user avatar
  • 2,405
0 votes
2 answers
174 views

What wing design provided the best energy retention for a fighter jet

As far as I know, tailless delta wings have the worse energy retention during a turn, is that true? If yes then why is that the case? Also jets like F16 with root extended shallow delta wings (40% ...
Samrat Dutta's user avatar
0 votes
0 answers
26 views

How do you determine VMCG, if its yawing moment by the inoperative engine is only be corrected by the rudder?

The requirement of VMCG is: VMCG, the minimum control speed on the ground, is the calibrated airspeed during the takeoff run at which, when the critical engine is suddenly made inoperative, it is ...
TRON's user avatar
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