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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8 views

Why couldn't the CRJ100/200 be equipped with triple-string autoland?

The gold standard for zero-visibility ILS approaches and landings is a triple-string autoland system, where the signals from the localiser and glideslope beams and the aircraft's radioaltimeter ...
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is there a free software like Airfoil Optimizer for airfoil selection?

is there a free and up-to-date alternative of airfoil optimizer software created by DaVinci Technologies (the same creator of airplane PDQ)? it should have the ability to take the aircraft properties/...
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1answer
141 views

Can I fly this six motor drone? [closed]

My body weight; 70kg, Drone weight; 50kg, Props length 0.7m, 6 motors (2hp each), Total weight 120kg, Total horsepower 12, Each motor runs 3000rpm, Please can I fly it. Thanks!!! drawing of the drone
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Make a 3 engine turboprop electric or steam hybrid aircraft?

Was thinking about this, have a 2 engine regular turboprop with a third electric engine for extra performance (imagine a DC3 like the Conroy Tri-Turbo-Three). The 3rd electric engine would be run from ...
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2answers
135 views

How to know the material of key-top?

Posted it here originally. There are keys (push buttons) on the front panel of an avionics device that fits inside the aircraft cockpit. I need to know the material of which those key-tops are made ...
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2answers
80 views

Does dihedral improve roll stability in gusty conditions?

Against roll instability, should I add more dihedral/a high wing? I'm trying to build an RC plane that can handle windy conditions. For that I want extraordinary aerodynamic stability. For ...
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3answers
158 views

Pros and cons of a thin cambered wing?

What are the pros and cons of a thin cambered wing? Does a thin cambered wing suffer from a flow separation bubble on the lower side, at cruising speed/low AoA? Very roundy leading edge, can air ...
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Why are the guns on the AC-130 not mounted on the underside of the aircraft?

Why must the guns of the AC-130 be on the side forcing the plane to circle the target. Would it not be more practical to have the guns underneath the plane shooting downwards?
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Why don't aircraft owners put vortex generators on the top of their flaps to extend single flap lift creation past 40 degrees?

Why don't ultralight/LSA aircraft owners put vortex generators (VGs) on the top of their flaps? I understand that the maximum flap angle for a single lift creating flap is 40°, but 80° with a double ...
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1answer
142 views

What is an augmentor wing?

What is an augmentor wing in the context of STOL aircrafts? and is it still used today? This seems to be a term that I can only find in NASA aerodynamics (specifically powered-lift) research papers in ...
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The wing has a pressure gradient along the AB direction, is there a pressure gradient along the CD direction?

The wing has a pressure gradient along the AB direction, is there a pressure gradient along the CD direction?
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157 views

During WWII, what did internal bomb bays and turret layout look like on flying boats?

I am writing an alternate WWII story, and I was wondering if you fine fellows on this site could help me. I am trying to make a fantasy bomber version of the USN Boeing C-98 Clipper, AKA the Boeing ...
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2answers
221 views

What is the reason why dihedrals are used when building a plane? [duplicate]

How does dihedral affect flight characteristics of a plane? I know it increases stability, however is it the only reason why it is implemented? If so, aren’t there more effective methods to stabilize ...
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1answer
251 views

What are the differences between battens and ribs?

What are the differences between battens and ribs?
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122 views

Can a modern airliner handle turbulence forces of +5/-3G?

In the BOAC Flight 911 accident the 707 likely experienced around positive 5G and negative 2-3G. The wings of the 707 were only about as 50% as flexible as the wings of airliners today. How would a ...
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6answers
233 views

Does angular momentum contributes in lifting a helicopter? [closed]

I want to know whether it is possible to make a helicopter with blades that rotate counter-clockwise (CCW) seen from below. I have difficulty understanding the angular momentum in this situation. As ...
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Are there any aircraft that either fold or employ folding in their design (such as with origami)?

I became curious about origami and its application to aeroplanes and was wondering if there were aircraft that either fold and/or employ folding in their design in interesting ways. Let's limit this ...
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3answers
233 views

Why do many aircraft have both all-moving tailplanes and elevators?

Many aircraft - particularly large commercial airliners - have both an all-moving tailplane (horizontal stabiliser) and elevators. (They also have a small third moving element on the trailing edge of ...
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2answers
163 views

Is it possible to Fly Aircrafts on Mars?

I have been fascinated with the thought of flying all kind Aircrafts on Mars. To begin, I don't know much about the fundamental things or requistes for flying. Is it possible with the the things we ...
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39 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
103 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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4answers
207 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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2answers
218 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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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
75 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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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
145 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
34 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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2answers
156 views

How has afterburner design changed since its 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
116 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
13k 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
160 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
38 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
70 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
71 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
106 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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39 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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1answer
114 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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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
568 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
395 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
110 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
57 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
75 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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207 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
348 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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