Linked Questions

98
votes
9answers
18k views

Is there a maximum possible size for an airplane?

Is there any theoretical or practical limit to the maximum number of passengers - and therefore size - one can build an airplane for?
39
votes
2answers
6k views

What type is this aircraft with “inverted” wings?

A friend of mine saw this plane at Tampa Bay International Airport recently: It has an odd combination of a negative dihedral and pylonless overwing engines, all traits I've seen individually but not ...
17
votes
4answers
4k views

Why does rudder cause roll?

In the few rudder incidents with the B737, rudder-freeze caused the airplane to roll. From what I know, the rudder causes yaw while the aileron causes roll. Why in the case of these accidents/...
14
votes
2answers
10k views

What is the reason for the poor low-speed characteristics of sweptback wings?

I know there are advantages of swept-back wings delaying shock-wave allowing a aircraft to fly faster. However, what are the disadvantages. I know one of them is that they have very poor low speed ...
13
votes
3answers
9k views

Why do low wing aircraft have higher dihedral than high wing aircraft?

I have noticed and read in books that low wing aircraft have higher dihedral than high wing aircraft. Dihedral is design feature for lateral stability so should be needed for both designs. So why is ...
11
votes
3answers
6k views

What are the pro/cons of polyhedral cranked wings?

Dihedral wings seems to be very common (almost if not all low-wing airliners, many modern gliders,...). Polyhedral seems to be less common and mainly found in relatively old aircraft (F4 Phatom, F4U ...
13
votes
5answers
3k views

Could a plane be constructed to be fly in fixed-stick roll-stable circles?

According to https://aviation.stackexchange.com/a/12511/973 it is not possible for a plane to aerodynamically recover from a roll disturbance. Is that an inherent limitation of how planes could be ...
12
votes
2answers
2k views

Why does the Falcon 900 have anhedral wings?

Why does it have anhedral wings and not "normal" wings? Many other similar aircraft with low-wing have dihedral wings. Source: DassaultFalcon.com Edit: This is about the Falcon 900, which apparently ...
4
votes
3answers
4k views

Why is the wing of large commercial jet aircraft usually located below the fuselage?

When the wing of an aircraft is located above the fuselage, the aircraft is generally considered more stable. When the wing of an aircraft is located below the majority of the fuselage, the aircraft ...
12
votes
1answer
2k views

In a slip or skid, how does one wing have a higher angle of attack and more lift?

I've discussed this with my instructor numerous times, and I have the concept memorized, but from an aerodynamic point of view, I can't see how the angle of relative wind to chord line is different ...
3
votes
2answers
3k views

What is the moderate dihedral angle for a low wing airplane?

An increase in dihedral results in a decrease of the total lift produced by the wings. I would like to know the moderate dihedral angle (in degrees) for a low wing airplane, especially the amature ...
4
votes
2answers
879 views

Does the dihedral effect happen during coordinated flight?

I have researched some about dihedral effect due to a question that I had, and I discovered that my question is essentially already answered, here and here, collectively. This has led me to a new ...
-2
votes
1answer
1k views

Is the Boeing AC-25A Banshee a real concept or a gimmick? [closed]

Could this be a feasible concept aircraft to replace the AC-130?
2
votes
5answers
552 views

Which way (if at all) do the ailerons need to be deflected in a full-rudder sideslip in a Cessna 152 or 172?

Do you typically have to maintain an aileron deflection in a constant-heading full-rudder sideslip in a Cessna 152 or 172? If so, in which direction? And why -- what is the source of the roll torque ...
5
votes
2answers
403 views

Why the Antonov AN-225 has negative dihedral wings combined with a positive dihedral horizontal stabilizer?

I know the reason why it has negative dihedral wings, but I do not really know why it is combined with a positive dihedral horizontal stabilzer, which are the benefits this configuration provides?