Questions tagged [fixed-wing]

Conventional aircraft where the wings do not move to create lift. Distinct from rotary aircraft such as helicopters, where the lifting surfaces (rotors) spin to create lift.

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Do symmetrical airfoils generate induced drag?

Cambered airfoils generate induced drag because they have a pressure differential between the upper and lower surface. However symmetrical airfoils don't. So does this mean that symmetrical airfoils ...
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How would I draw the Max Thickness Sweep Angle on a wing from a Top View?

I have the Max Thickness Sweep Angle, Wing Tip and Root Chord Length, and Max Thickness to Chord Ratio defined. However, I am having trouble drawing the Max Thickness Sweep Angle on the wing because I'...
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Lifting Line Theory - The general lift distribution

While studying the derivation of the lifting line theory using different text books like Fundamentals of Aerodynamics by John D. Anderson, Precisely when deriving ...
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3 answers
258 views

What is the maths behind Loitering of Aircraft?

I am making a controller for loitering using PIDs. The equation which is used to find the radius of circle given bank angle and speed is in following link: How to calculate angular velocity and radius ...
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2 answers
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Do rotorcraft flight hours count for airlines requirements?

I have a question about flight hours. Many civil airlines require first-officers to have over 1500 hours. I have 300 hours for fixed-wing, and also have 2000 hours for rotorcraft(helicopter). In this ...
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-4 votes
2 answers
206 views

What is a "fixed wing" aircraft?

I’ve been trying out different hobbies over the last year, and plane spotting is my current one. I’ve heard some terms being thrown around about planes like the ones at the Airport - what is a Fixed ...
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Why is the ball no longer centred in a multi-engine airplane with inoperable engine?

I'm currently working on my PPL, and whilst trying to understand fully how the turn coordinator works, I got down a rabbit hole that makes me question my understanding, and that I can't dig myself out ...
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Drag estimation of Xfoil and Vortex Lattice Method?

I have been working on building a software to estimate lift and drag properties of a fixed wing being tested at a wind tunnel. The setup is a low AR wing with NACA0012 profile and 0.3m chord, with 0.4 ...
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Can we get 0:40 thrust to weight ratio from three small engines

Because I have an engine of 13 hp four stroke 1 cylinder that pulls about 0:20 T/W ratio. and is it possible to multiply the thrust by two? Using two more small engines which is 6.5 hp each on the ...
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What characteristic my canard needs to have when the canard also carries a pair of engine?

I am in 3rd year Aerospace Engineering and trying to do a preliminary design of an airplane. My design has a front wing that also has an engine at its root on both side of the fuselage. There is ...
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Fly a fixed wing single propeller airplane like a helicopter?

Has anyone tried to "helicopter" an airplane? And succeeded? And posted this video on the internet where I can find it? What I'm talking about with what I would call a "helicopter&...
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Pressure distribution on Aircraft wing

While conducting a structural analysis FEA for an aircraft wing, I had to import the CFD pressures acting on the wing, lets say at an A.o.A = 10 deg, at 80 m/s and at sea level, and say the ...
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1 vote
3 answers
799 views

Single vs Twin motor for an electric RC airplane

I'm designing a fixed wing UAV for a project. I need an airplane that can fly for at least 200 minutes. Obviously, it means a big battery and thus a lot of added weight. I've been debating whether or ...
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1 answer
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Wing flex physics?

What physics is involved with wing flex when in air? A simplified answer will suffice. I can understand when on the ground that a heavier wing makes it bend more down. My feeble understanding: When ...
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Can a tiltrotor fly safely with one engine?

I am curious about tilt-rotor feasibility (such as AW609) against fixed-wing and rotor-blade aircraft (conventional helicopters). One important issue that immediately arises in my mind is that both ...
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In fighter jets, is the minimum speed calculated with the flaps in the down position or up? [closed]

I asked that question because F16 flying straight and level at minimum speed does not have flaps down. So how is the minimum speed calculated by aircraft designers?
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Why are propeller driven aircraft commonly built with a higher wing aspect ratio and a straighter wing angle?

Why do propeller driven aircraft (especially smaller ones like fighters) tend to have a narrower wing with a higher aspect ratio and a more perpendicular wing angle in relation to the body, whereas ...
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1 answer
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Could a rotor head wing be plausible?

Could a helicopter support a detachable wing with no controls on top of the rotor head in place of a radar dome? Could the rotor head be made to support more weight? Would it be more fuel efficient at ...
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Could a BV-347 be upgraded by extending the wings?

The CH-47 Model 347, also referenced as BV-347, was a helicopter that utilized a wing for forward flight and to carry external payloads. Could the wings be extended and engines on the rear rotor ...
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1 answer
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Would this modified tire work to prespin an aircraft tire? [duplicate]

In order to decrease that initial hit of the tire spinning up to ground speed on the runway, could adding a blades or shape into the tire rim of a commercial plane save on tires by prespinning the ...
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3 answers
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how are UAV systems (aircraft+ground facilities) fitted with landing aid system?

For commercial aircraft, precise landing aid systems (ILS, GBAS) are required for autolanding, but these navigation systems are too expensive to be used for UAV operations. However, a lot of UAV OEMs ...
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Positions of drag wires in a bay

Take a good look at the small dots • on the bays of this two spar wing. My question is: Are the drag and anti drag wire as seen in bay 1 supposed to connect to the root of the compression tube Or ...
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2 votes
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From which rating would it be easier to transition to an Osprey? Fixed-wing or rotary-wing?

If the future of flight was to be on aircraft that were a hybrid of fixed-wing and rotary-wing (for example the Osprey), assuming they had similar technical abilities and the same number of flight ...
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Straight Wings VS Delta Wings, Variable wing with Forward swept capability [duplicate]

What are the Pros and Cons (Advantages and Disadvantages) of a Delta wing and a Straight wing against each other, and if a Variable wing with a capability to become a Forward Swept wing is even ...
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1 vote
1 answer
211 views

How do the vortices of a fixed wing and horizontal stabilizer interact? [duplicate]

What interaction of vortices between the fixed wing and horizontal stabilizer? How do the vortices affect the flow of the horizontal stabilizer upon leaving the wing? when will the downwash effort ...
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What are a few main differences between ATC interactions for rotorcraft vs fixed-wing?

The title says it all. In particular, I'm wondering what the differences are in reference to: Takeoffs and landing - can rotorcraft be cleared to take-off / land directly from / to the helipad? When ...
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What are the minimum hours required for private instrument fixed-wing plus commercial helicopter?

I want to get my private pilot plus instrument rating in fixed-wing aircraft for personal use. In addition to that I want to get my private and commercial in helicopters to start a career in flying ...
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2 votes
1 answer
3k views

How is the airfoil of a fixed wing ultralight constructed?

This is a good example of the type of ultralight I am trying to build: (Source) How might the airfoil be constructed in this plane? My guess was that it's mostly created by the cables that suspend ...
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3 votes
1 answer
3k views

What is the shape of the power required curve?

I understand that when flying level, some power is required to maintain altitude, this power amount being: Normally larger when the speed is larger, this is flying on the forward side of the required ...
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10 votes
1 answer
493 views

Is there a fixed-wing aircraft that uses a scissor propeller configuration?

(Source: primeportal.net) Has there ever been a fixed-wing aircraft whose propeller is in a scissor configuration? Like the Apache's tail-rotor seen here: What are the benefits of a non-orthogonal (...
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6 votes
3 answers
623 views

Do wingtip vortices really only form when airplane wheels are separated from the ground?

My GA theory textbook (which covers fixed wing up to and including EASA PPL) has some suggestions on taking off and landing light aircraft soon after large aircraft (besides avoiding it, if possible), ...
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How is the centre of lift and centre of gravity misalignment problem solved in Delta wing aircraft?

Since Delta winged aircraft don't have horizontal stabilizers to produce down force, how is that problem solved ?
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1 vote
2 answers
369 views

What are the dynamic stability properties of an aircraft with wings exactly at the vertical CoG?

Please ignore for a moment the practical issues with building and operating an aircraft like this. Suppose a fixed-wing aircraft which, when viewed directly along the roll axis, has the wings ...
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4 votes
5 answers
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Why are there no 4-winged airplanes?

With larger wings comes more drag. So why don't large planes have 4 smaller wings instead of 2 very long ones?
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81 votes
14 answers
42k views

What is the slowest fixed-wing airplane?

It's easy to find information about the fastest airplanes, in different categories (e.g. X-15, SR-71, the Concorde etc), but what is the slowest one? Which powered, manned airplane is capable of ...
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5 votes
1 answer
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What are the aerodynamic advantages and disadvantages of the Weltensegler wing?

What are the aerodynamic advantages and disadvantages of the Weltensegler Wing? Would this kind of wing configuration come to help for a glider? Is there any difference between them and gull wings? ...
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1 vote
2 answers
1k views

Could flywheel type gyros stablize a plane?

An aircraft carrier has massive spinning gyros to keep the ship upright against waves. Do planes of any type have gyros like those used in satellites? Not instrument gyros. In the picture below ...
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1 vote
0 answers
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How does the University of Bristol's AI fixed-wing perched landing change the wings?

The BBC radio program Click's 2017-01-24 episode, starting at about 06:20, describes the use of AI to develop a perched landing capability by an autonomous fixed-wing craft. I can't understand exactly ...
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3 votes
4 answers
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Has anyone attempted to recreate the Sack AS-6 (German Saucer-wing)?

I remember seeing pictures of this as a kid and wondered whether anyone has since recreated this saucer-wing aircraft and made it work? Source (excuse the pun)
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2 votes
2 answers
239 views

Feasibility of using secondary props to generate power on an electric model aircraft [duplicate]

Beginning with the aeroplane itself, it is a small, fixed wing model aeroplane, reminiscent design-wise to a Cessna 172. It is completely battery powered and has a primary prop attached to a motor ...
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8 votes
4 answers
3k views

Is there anything wrong with this more symmetric aircraft design, and why isn't it used?

I imagine a fixed wing airplane design that's a lot more symmetric than what I see today. This symmetric design has wings in the middle of the fuselage (neither high wing nor low wing), and the ...
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7 votes
4 answers
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Is a fixed wing more efficient in reaching a certain altitude than rotary wing?

Given the limited amount of energy (battery or fuel) let's reach the maximum possible altitude! Rotary wing aircraft pushes the air directly downwards and propels itself straight up. Fixed wing, ...
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3 votes
3 answers
767 views

What is the drag of helicopter rotor at jet speed?

I wonder if a jet plane can have helicopter rotor for vertical take off and then, when moving forward just stops that rotor and uses lift from wings like normal plane. Since rotor blade seems thinner ...
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5 votes
3 answers
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What are the advantages or disadvantages of a mid wing design?

Are there advantages or disadvantages to a mid wing design for a monoplane? If so, how would this design compare to a high wing or a low wing monoplane design? What might be the aerodynamic ...
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1 vote
3 answers
457 views

Can 'neutral static stability' only be achieved by constantly augmenting the control surfaces?

I watched a flight mechanics lecture that mentioned that some combat aircraft like the Hornet has a 'mode' where the on-board computer simultaneously and automatically adjusts all the control surfaces ...
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5 votes
1 answer
3k views

What are the advantages and disadvantages of level flight with a nose-down attitude? [duplicate]

This is a questions about fixed-wing aircraft in general -- commercial planes and smaller. I have seen on a video that planes are capable of flying in a holding pattern with an nose-down attitude "for ...
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17 votes
4 answers
32k views

What is the performance of a flat plate wing?

By flat plate I mean this: Source: Physics.SE Low performance indeed, but how much low? How would: The angle of attack, The speed range, The turn capability, The fuel consumption, Or other ...
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6 votes
1 answer
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How does stall risk in paramotors differ from that of conventional fixed-wing aircraft?

I happened to be walking past a small outdoor fair today, and saw someone flying a paramotor. The craft took off and started a steep ascending turn losing speed rapidly, seemed almost to come to a ...
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7 votes
1 answer
552 views

What are the differences in design considerations for ground attack and air dominance aircraft?

What parameters and types of performance are designers trying to maximize when building an air dominance fighter plane rather than a ground support fighter? What are the trade offs between them - what ...
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8 votes
4 answers
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Is it harder to learn to fly rotary wing after learning on fixed?

I have a private license for single engine land and I want to transition to helicopters. I have been told by some that learning helicopters is more of a challenge after learning fixed wing. However I ...
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