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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.

2
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1answer
29 views

Is there a Risk of Tail Tipping during Push-back of a passenger aircraft?

I remember that there were countless incidents occurred in which the aircraft sits on the tail as the aircraft was heavily loaded at the back of the cargo and/or cabin compartments or the cargo ...
0
votes
0answers
65 views

Does a no-touch policy really work?

In Boeing 787 and Airbus 350 aircrafts, more than half of the aircraft body is made of composite material. The composite structure of the fuselage does not indicate the damage when the body is ...
8
votes
3answers
140 views

If a Boeing 707 hits turbulence that registers as +5 G on the FDR, would the 787 experience lower G forces due to the flexibility of their wings?

A 707 being a much older plane with relatively stiff wings compared to the 787. What percentage would the g forces be reduced on a 787 given its wing flex? And yes, I mean if the 707 and 787 were ...
15
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2answers
2k views

Why is the S-duct intake on the Tu-154 uniquely oblong?

Is there an advantage to the oval/elliptical shape of the Tu-154's S-duct intake? It appears to be taller and an overall different shape than the side-mounted cowlings. This doesn't appear to be a ...
-2
votes
2answers
257 views

Is this a video of severe turbulence for an Airbus A320? (video) [on hold]

I remember reading that in 1966, a 707 encountered turbulence and the wings and tail were torn off (BOAC 911). Is this video at all comparable? Is the A320 more robust than the 707?
11
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4answers
4k views

Do high-wing aircraft represent more difficult engineering challenges than low-wing aircraft?

Generally, it's easier to make things strong in compression than in tension. In a low-wing plane, the weight of the aircraft is on top of the wing; in a high-wing aircraft, it hangs from it. It ...
5
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3answers
273 views
+50

Are there any current projects/plans for a VTOL passenger airliner?

I was very surprised to see there's a seemingly underway project for a VTOL "business aircraft" that seats a few people. http://xtiaircraft.com , https://www.startengine.com/xti-aircraft They ...
2
votes
2answers
125 views

Will creating a strong back pressure within a ducted propeller enable an aircraft to attain a higher altitude?

I would like to know if creating a strong back pressure within a propeller duct will enable an aircraft to attain a higher altitude. Please reference the conceptual drawing below. This is showing a ...
1
vote
1answer
124 views

Limitations of bird flight as an aircraft design

What is it that stops man from duplicating Bird Flight as Engineering? After all, birds do not require separate propullsion! They use the same wings for propulsion and navigation. My question ...
0
votes
1answer
136 views

Are there surveillance cameras in aircraft cargo bays?

I've heard that there are cameras on the fuselage and wings of some passenger aircraft. Is there a similar surveillance system in-built at the cargo bay/compartment of a passenger aircraft? During ...
0
votes
0answers
48 views

U.S trustee for non US citizens seeking to buy “N” registered airplane [closed]

To register a plane, owners need to be a U.S. citizen or a permanent resident. However, the FAA will allow foreigners to register their planes by transferring a title to a U.S. trustee. For $5, an ...
1
vote
1answer
38 views

In the US, is there much variation among the various ARTC Centers as to where a SVFR clearance may be granted?

In the US, is there much variation among the practices followed by the various ARTC Centers and Approach Control facilities as to where a Special VFR clearance may be granted?
28
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5answers
3k views

Would an 8% reduction in drag outweigh the weight addition from this custom CFD-tested winglet?

I'm writing an essay at school about why there is so much variation in winglet design. I am analysing all the primary types of winglets used today in the aviation industry. I'm constructing them in ...
1
vote
0answers
19 views

How does Mach number of Jet engine vary with respect to Compression Ratio?

How does the performance of jet engine vary with Compression ratio. What are the variables that affect the Mach number of Jet engine.
7
votes
1answer
241 views

Why do Russian jets make a squealing sound?

Why do the engines noise from the Russian and Soviet jet create a squealing sound which is very distinct which most of the western jets don't have? Which part of the engine creates the noise, and why ...
4
votes
1answer
151 views

Are there any Navions on floats?

I have a friend that is considering putting his Navion on floats. A huge challenge. I recall having seen a photo of a Navion on floats, an old black and white photo, but I can no longer find it. If we ...
2
votes
1answer
140 views

Why does the European MALE RPAS UAV use twin engines?

I don't know why the European MALE RPS UAV designers chose to use twin engines? I know two engines are expensive but add safety... Does choice is to obtain mass flow @ Medium altitude(low air ...
1
vote
0answers
48 views

What is the effect of the Load Factor on wing Structures?

I am quite confused with the definition of Load factor and how it applies to the wing structures of an aircraft. For example, you have an Aircraft being subjected to a Load Factor of 2 and whose ...
4
votes
2answers
218 views

How do modern turboprops avoid slow spool up of early jets?

I was reading about modern crop dusters that are blessed with 600 or more horsepower turboprops and have seen them do amazingly effortless high angle of bank turns near the ground. It seems that a ...
31
votes
2answers
8k views

Has a commercial or military jet bi-plane ever been manufactured?

Are there any, or have there ever been any commercial/military jet bi-planes? What would be some of the major advantages vs disadvantages if one was built? Electric radio controlled ducted fan model. ...
2
votes
1answer
119 views

Why the need for the MCAS on the Boeing 737 Max 8?

Was there a problem with stalling on 737 jets before the 737 Max, if not then why is MCAS needed on the 737 Max 8.If it was a problem why did Boeing wait so long.
3
votes
1answer
125 views

What happened to the Fokker 100 revival project?

What happened to the Fokker 100 revival project by NG Aircraft? They wanted to build a better Fokker 100 called the Fokker 120NG/Fokker 130 in 2010-2014 which originally should be completed this year....
22
votes
5answers
9k views

Why was the Spitfire's elliptical wing almost uncopied by other aircraft of World War 2?

The Spitfire was one of the most successful designs of its day, with flying qualities of a similar standard to the other best designs of the era. In its decade of production from 1936 it grew bigger, ...
1
vote
2answers
110 views

Why was the Electra uniquely vulnerable to whirl-mode flutter?

The Lockheed L-188 Electra, notoriously, suffered from early problems with whirl-mode flutter, which caused two Electras to break apart in flight in 1959 and 1960, forcing an expensive redesign of the ...
0
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1answer
122 views

What are the STOL features on the Pilatus PC-6 Porter?

What's so special about the Pilatus PC-6 Porter that makes it a world-leading STOL aircraft? How do its features work?
0
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0answers
55 views

Is Engine up thrustline actually desirable for “speed stable” designs?

The much maligned Max 8 and the Buckeye Navy trainer. What could they have in common? Both would want static stability (trimmable speed stable approach) for landings. Both would want maximum fuel ...
2
votes
1answer
132 views

What is the input range of common fly-by-wire controls?

What's the range that typical fly-by-wire controls (let's take A320 and B777 as examples) allow inputs in? The A320 controls in the y-axis of the side stick (forward/backward axis) the g load - what'...
0
votes
1answer
178 views

Which helicopter can auto rotate the farthest? [closed]

Could the rotors be modified to perform better at auto rotating and maybe less at powered performance?
27
votes
2answers
9k views

What helicopter has the most rotor blades?

I have seen 2 rotor blades up to many and wonder when does having more rotor blades become less efficient? What helicopter has the most rotor blades? Related: Why don't helicopters prefer shorter ...
4
votes
2answers
2k views

Why complex landing gears are used instead of simple, reliable and light weight muscle wire or shape memory alloys?

Muscle wires actuators are really simple, have a high power density and are reliable. Landing gears on other hand are used only twice per flight while taking off and landing (if everything goes well ...
2
votes
3answers
185 views

For length in aircraft design, and in weight and balance manuals, what measurement unit does Airbus use?

What length measurement unit does Airbus use for aircraft design and in their weight and balance manuals? Meters or centimeters? Possibly they use both like Boeing does for, say, feet plus inches for ...
6
votes
1answer
155 views

Do any aircraft possess washed-in wing characteristics?

I have been teaching ground school at my local Canadian Air Cadets. When I was teaching about the wing twist of an aircraft, I was asked if any aircraft possess washin characteristics (vs washout). ...
32
votes
9answers
12k views

Why are there no cargo aircraft with “flying wing” design?

From that I have seen so far, the "flying wing" design (like the one of B-2 Spirit and Northrop YB-49) has superior performance but also a few notable problems that make it difficult to use for ...
0
votes
3answers
612 views

Could the Boeing 757 replace the Boeing 737 Max 8/9/10? [closed]

The "Baby Boeing" 737 started life in the 1960s with roughly half the thrust and around 60% of the weight as the 757. In stages the 737 grew into a capacity squarely in the range of the 757. ...
6
votes
4answers
494 views

Why is alcoholic gasoline such a showstopper for aviation?

One of the main reasons the common avgas grades are still full of 3-plumba-3,3-diethylpentane is the incompatibility of many aircraft fuel systems with the oxygenates (primarily ethanol, with some ...
0
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4answers
151 views

Does an rc plane tail also have airfoil or is it just flat material? [closed]

I've chosen an airfoil for the wing, now i'm confused weather i should do the same for tail or just attach a flat piece of wood as tail. I'm going for conventional tail design. This is my first ever ...
-1
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2answers
131 views

How are aircraft brakes applied? [duplicate]

I read somewhere that when both rudder paddles are pushed simultaneously it produces a braking effect. Is this true? If yes, please provide a detailed description of the above mentioned system.
2
votes
1answer
100 views

Could placing a fan jet further in front and closer to the wing create undesired pitch motion from its exhaust?

So far in discussion of the Max 8 people have mentioned CFM LEAP cowling size and 737 tail design as possible factors in the need to develop a MCAS system to control tendency to pitch up at high AOA. ...
46
votes
3answers
4k views

What is the offset in a seaplane's hull?

I noticed there is a little offset in a seaplane's hull (highlighted in the following picture). I suppose this is useful as it exists in all the seaplanes I know. It appears to be neither a ...
3
votes
1answer
135 views

Do aircraft engineers take into consideration engine placement to avoid ground strikes in a cross-wind landing?

On a multi-engine airplane with wing-mounted engines, do aircraft designers have a standard way of ensuring that the banked landings associated with cross-wind's do not cause a prop or engine-housing ...
8
votes
5answers
5k views

Has there ever been an airliner design involving reducing generator load by installing solar panels? [duplicate]

Has there ever been a trial/project/design, in which solar panels were incorporated in the design of a commerical airliner (e.g. on the wings), with the aim to reduce fuel consumption by lowering the ...
0
votes
2answers
57 views

How does Mass affect rate of turn?

After seeing effect of speed and bank angle on rate of turn, how would one mathematicly calculate the effect of changing mass. For example, in a 30 degree turn at 100 knots, how would the rate of ...
2
votes
1answer
186 views

Can airlines choose whether or not to enable MCAS on their fleets, and if so, have US airlines chosen to do so?

I've been told that, although all 737 Max aircraft are equipped with MCAS, the system can be deactivated by the individual airline. I've also heard that US airlines never activated MCAS in their 737 ...
0
votes
1answer
87 views

Airfoil- concave top and bottom [closed]

I remember building a radio controlled model in the early 90s with concave wing ribs/surfaces top and bottom...both sides of the wing were undercambered... It was a very great flying model...60" ...
2
votes
2answers
89 views

Can I use the load factor to estimate the lift?

If I have a fixed aircraft as the baseline, then I am not sure the specific flight condition, can I use the load factor to estimate the lift on the wing?
2
votes
3answers
277 views

Why aren’t there any lifting-canard airliners?

A lifting-canard aircraft, such as the Long-EZ, is an aircraft with the main wing at the back end of the fuselage and a pair of small, highly-loaded canards attached to the forward fuselage; the ...
16
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2answers
4k views

For airliners, what prevents wing strikes on landing in bad weather?

For any low-wing aircraft, particularly the MD-80 or some of the private jets, CRJ's, the wings appear about 5ft or less above the ground. It seems that just few degrees of roll before touchdown would ...
6
votes
4answers
2k views

Are taller landing gear bad for aircraft, particulary large airliners?

Buiding larger engines for larger aircraft as opposed to smaller but many engines has proved to result in more fuel efficiency. Having established one of the main drawbacks or impediments to building ...
0
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0answers
35 views

Bird strikes and engine protection [duplicate]

I am just wondering why the creators of aircraft cannot come up with some sort of high utility screens to mitigate bird.srikes. Thank you!
3
votes
3answers
154 views

Is there a general approach for designing a Trimmable Horizontal Stabilizer?

What is the general design flow when designing a Trimmable Horizontal Stabilizer (THS) and the attached elevator? I assume you would dimension the max. positive/negative deflections of the THS to ...