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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0answers
30 views

What is the engine shell temperature?

What are the highest temperature locations in the outer shell on an aircraft engine? Particularly, modern turbofans like the Trent 900 for example. I'm interested in the temperature constraints of ...
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2answers
60 views

Can winglets be used to compensate the high induced drag created by a low aspect ratio wing?

I have read in some articles that the major advantage of having a high aspect ratio (AR) wing is to reduce the induced drag. If winglets main job is also to reduce the induced drag, how much drag does ...
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Is 11.7HP engine is enough to build RC Coaxial Helicopter? [closed]

I would like to build a Remote Control Coaxial Helicopter for a delivery system using a Honda GX389cc 11.7HP engine. The gross weight will be 70kg. Will it work for me or not? And what propeller size ...
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4answers
166 views

Why did wings start to be made with aluminium skin instead of fabric?

Why did engineers start designing planes with aluminium skin on the wings instead of fabric covering? While the force of lift acts on the skin, to my knowledge it is not subject to high stresses
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1answer
119 views

Why does the NASA X-57 need a “gust control system”?

Why are NASA's engineers concerned about gusts affecting the X-57? I understand that NASA is recommending automatic torque based prop speed control to be used in flight but also in gusty conditions. ...
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0answers
175 views

Has any pilot successfully flown through a hurricane with a single-engine prop plane?

Has any pilot successfully flown or could a pilot crab through a hurricane using a plane such as a Cessna or bi-plane? Would acrobatic planes work better because of their nimble agility and high power-...
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1answer
71 views

Is Ducted fan or Propeller better to maximize forward speed of RC aircraft with a given power?

I'm designing an RC aircraft of which the final goal is a crazy top speed. I'll be 3D printing and sanding / finishing the air frame surfaces to reduce drag. In order to achieve maximum top speed, ...
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7answers
3k views

Why don't bypass ducts in jet engines narrow down the flow to accelerate it?

Since decreasing the flow area increases flow velocity, why don't turbofan bypass ducts narrow down to produce more thrust?
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2answers
11k views

Why is the A380's fuselage designed with a flat bottom?

I want to know if there is some explanation for why the A380 bottom is flat instead of the oval shape, just near the wings.
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2answers
2k views

Is it feasible to add an aftermarket hydrofoil to a light aircraft?

Could long, aftermarket hydrofoils be added to the water-skids of a plane (like this Cessna with pontoons or smaller) Cessna 208 Caravan not designed to have a hydro foil, to increase its ability to ...
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1answer
139 views

Are there all terrain landing gears for planes?

Is there a landing gear set up that will allow a single engine plane (also, allowing for tundra tires than what is not available for current water skids) to land on rough grass and water? The wheels ...
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0answers
33 views

How much does the design, implementation, test and certification of a Passenger-to-Freighter Conversion cost?

This question answers how much it costs to convert a given aircraft from passenger to freighter once the STC is approved by the FAA. How much does it cost to obtain the STC in the first place? If this ...
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1answer
114 views

How has afterburner design changed since it's inception?

I came across a NACA summary paper on the past 5 years of afterburner development and started reading cause it seemed interesting. However, a couple of pages in I scrolled back up and realized that it ...
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2answers
106 views

What are different components of an engine pylon?

What are the different structural components that are inside the fairing of engine pylon and what are the functions of each part? The pylons for each aircraft are made of Ti-64 alloys, can they be ...
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3answers
12k views

Why are commercial aircraft windows typically oval instead of circular?

Pretty much what the title says. Surely a circular window would allow more window area while not compromising on strength? Some planes(Gulfstream jets) do have circular windows. Is there a reason for ...
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4answers
153 views

Will it be more efficient if airplanes flap like birds? [duplicate]

Many airplanes have parts that are designed to mimic some features of animals. I have also read that birds are incredibly more efficient than most of the airplanes we see today. I wonder, will the ...
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1answer
36 views

What is the mathematical relationship between Specific Excess Power and an aircraft's acceleration at a given point on an E-M diagram?

If an aircraft is on the x-axis of an E-M diagram plot (zero turn rate) where the Specific Excess Energy (Ps) = 800, we understand this to mean that the aircraft has the potential to either ...
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1answer
65 views

What safety precautions are taken for an airline prototype test flight?

Regarding the software, the equipment and the personnel. Can the crew jump out of the plane with parachutes or is it a bad idea? Additionally, if you would compare the safety of today and the 1970/80s ...
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1answer
70 views

Which among the two contributes most of the lift, the upper or lower surface of the airfoil? [duplicate]

I see some explanations that lift is due to the suction of low pressure on the top surface of the wing and deflecting down of airflow on the bottom which results to upward force lift. I wonder, which ...
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2answers
101 views

How far away should the vertical stabilizer be from the leading edge of the main wings?

I am wondering what the advantages and disadvantages are of placing the vertical tail nearer to, or farther from, the main wing. For instance, when the vertical tail is just behind the wing, do the ...
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0answers
38 views

How to correct dynamic stability of UAV fuselages?

I was trying to design a fuselage model of UAV with considering lift coefficient (CL), after this I analyzed stability of both wing on fuselage. First I did the individual analysis for wing and ...
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0answers
23 views

Why doesn't DATCOM calulate variation of pitching moment due to elevator deflection above certain altitude?

I'm trying to get the "Cmδm" (variation of pitching moment due to elevator deflection) thanks to DATCOM. I do get these coefficients at low altitudes but above around 10 000 meters all ...
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1answer
106 views

What is the temperature range of engine mounts connected to the pylon?

I want to know what is the temperature of the engine mounts in modern turbofan engines for example, Rolls Royce Trent 900. Also, what are the temperature considerations you need to make while ...
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4answers
3k views

What would an all-flying aileron look like, and would it be a good idea?

The only info I could find about someone doing this IRL was the British Army Aerorplane No. 1, but I don't think it ever flew with them. I don't know much about how this would affect the aerodynamics, ...
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4answers
4k views

Does the Air Force (United States) help design their own planes?

I know that companies such as Lockheed Martin and Boeing design and build planes for the US Air Force. However, when I was thinking about this, I realized the Air force has no part in designing the ...
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3answers
554 views

Is the APU classified as a component of Airframe or Powerplant?

In the classification of systems and components on the aircraft - is an APU classified under the Airframe or the Powerplant?
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1answer
385 views

What material is the B737 wing skin made out of?

What material is the B737 wing skin made out of? I actually couldn't find much information on the wing skin upper and lower panel materials for the B737, the general guess is of course aluminium, but ...
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0answers
106 views

How hot is the outer casing of a turbofan engine?

I am able to find temperatures inside different components of turbofan engines, but I can't seem to find what would be the temperature of the external casing/shell of the engine. For example, ...
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1answer
53 views

On an energy-maneuverability (E-M) diagram how does the shape of a specific excess power (Ps) curve change as thrust is increased or decreased?

Most E-M diagrams for high-performance aircraft show a "dog house" plot with turn rate on the Y axis and velocity on the x axis. They may also have additional lines for constant turn radius ...
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2answers
89 views

Can UHMWP be used as composites for aircraft impact susceptible areas?

Can Ultra High Molecular Weight Polyethylene (UHMWP), be used as composites for aircrafts impact susceptible areas? I did some research but could only see UHMWP being used as a hybrid with graphite/ ...
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1answer
72 views

Material alternatives for aircraft leading edge

Are there any material alternatives for the aluminium used on the aircraft leading edge? By alternatives, I mean composite alternatives.
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2answers
194 views

What type of airfoil do low-supersonic aircraft use?

I understand that supersonic airfoils have better performance supersonically, but it seems at if they are not always used for any aircraft that goes supersonic and that supercritical airfoils are ...
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1answer
344 views

How safe are commercial airliners from gallium infiltration?

I recently saw a video on gallium infiltration on YouTube. Gallium is a metal with a melting point somewhere between standard room temperature and human body temperature, meaning if you pick up a ...
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1answer
115 views

What materials form the structural elements of the Boeing 737?

What materials form the structural elements (leaving the spars, ribs etc) of the B737? It was tough to get any information on the kind of composites used on the 737 structure. Hoping to get some ...
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0answers
66 views

What is the theory of the ram's horn yoke? [duplicate]

Embraer tend to use a Ram's Horn yoke in the Phenom and many of their RJ aircraft: And Cessna uses a more standard yoke with vertical sides: What is Embraer's reasoning for the Ram's Horn Yoke? Are ...
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1answer
98 views

How do rotor tangs lock into wheel keyways?

How do the rotor tangs lock into wheel keyways? Are there special keys on the outboard wheel half that allow locking the tangs in place? Also would be great if anyone could provide me with a image of ...
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7answers
4k views

Plane that always flies into the wind?

Suppose that you dropped an uncontrolled, dummy glider into the air. You want it to always face into the wind by design. Would it be possible? If so, what would such a plane look like?
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1answer
191 views

Is/why isn't the Antonov 124 to 225 wing upgrade method common?

I'm told that wing redesigns (edit: for tapered, swept wings) are difficult, so variants of a model often do with a common wing optimized for the middle member. But then I read the following: Based ...
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1answer
98 views

RC airplane required engine power

I'm going through the process of designing an RC airplane. I know that probably most calculations on scale models might be non-precise ones, but I'm trying to do it as correct as possible (it's a ...
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1answer
109 views

Why is CL/Cd equal to L/d?

I'm making a school project where I intend to design and calculate an rc airplane. Reading some books I found something I can't understand, it says that CL/Cd is equal to L/d, but the only possible ...
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4answers
191 views

Why are true and indicated airspeed different?

So, I understand that True air speed is the motion of aircraft relative to air around it. And, indicated airspeed is speed arising due to dynamic pressure. Considering a true airspeed of 100 knots, ...
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2answers
89 views

What is the aspect ratio of T-tail for common twin turboprops?

I'm trying to figure out typical AR values for a T-tail configuration (at the conseptual design phase). Working with Raymer I found this table: I can see the typical AR values for the vertical tail ...
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0answers
64 views

What kind of motors are used in electric autopilot servos?

In terms of general aviation/experimental autopilot servos for control surfaces, are these motors usually brushless DC or stepper motors? Some examples are: Garmin GSA 28 (brushless DC) Dynon ...
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2answers
185 views

Is the Batjet Design Physically Feasible?

I realize the plane is fictional. However, in the Batman Animated Series by Warner Bros, we see this Batjet. So this got me thinking (and I'm not a physicist): is this air frame configuration even ...
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1answer
44 views

How do you calculate the wing moment coefficient knowing the moment at each spanwise station?

A lot of theoretical formulas exist for finding the moment coefficient for airfoils, but I have been confused by how to get the moments for a wing. I came up with three related questions that have ...
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0answers
112 views

How can a designer deal with a strict requirement when designing an aircraft?

I'm working on designing an aircraft with some specific requirements (Vstall, Vmax, Ceiling, Payload, Range, RoC, Slanding/takeoff etc). I'm following Anderson's and Raymer's ways (trying to find the ...
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1answer
114 views

What is the angle of Incidence of wing of Airbus A320?

What is the Angle of Incidence/ Mounting Angle of the wing of AIRBUS A320?
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1answer
240 views

Is this how ailerons are actuated?

I was wondering how ailerons work on fighter jets. I came across this after hours of research. Is that how fighter jet ailerons work? Is their a better picture or image that would be better. If there ...
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10answers
6k views

Is there an aviation career where I would help design an entire aircraft and its systems?

If I want to design and build planes, what career would that be? Would it be a mechanical engineer, systems engineer, or what else. (I feel like saying aerospace engineer is too vague and most ...
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1answer
202 views

Is it possible for Mig 21 at corner speed to extend the flaps to minimize the turn radius? Or this is not an option?

The corner speed is around 330knots if you want to turn better than the enemy is possible to lower the flaps?

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