Linked Questions

19
votes
3answers
10k views

Why is the Tu-144 the only commercial airplane with canard configuration?

I understand the delta wing was chosen because of the supersonic cruise (like the Concorde), and canards were added to reduce the approach/landing speed. But canards may be used without delta wing (e....
16
votes
4answers
2k views

Do any airplane designs exist that don't involve a flight surface that provides downforce?

Most aircraft maintain longitudinal stability by balancing three forces: The down force acting through the center of gravity (CG) The lifting force acting through the center of lift The down force ...
21
votes
3answers
6k views

What does it mean for a plane to be aerodynamically stable?

I've heard that most planes (excepting fighter jets) are "aerodynamically stable." What does that mean? Let's say you're cursing around in a Cessna 172 without autopilot, and you take your hands off ...
6
votes
3answers
5k views

Why is managing CG (centre of gravity) important?

Why do people have to worry about CG? Is it primarily due to fuel penalty, or take-off and landing performance, or is it mostly just to keep the aircraft from tipping over during loading and unloading,...
10
votes
2answers
2k views

Why did moving the CG aft on the Wright Brother's plane improve handling?

In response to Peter Kämpf's answer to this question, why did moving the CG back on the Wright Flyer improve its stability?
12
votes
2answers
3k views

Is A380's center of gravity really too far back?

I have searched and even studied plans from Airbus itself, but I was not able to confirm the following and would like to ask if the information I have is correct. TLDR version so you don't have to ...
6
votes
3answers
1k views

Why can't planes use only flaps in the tail section instead of stabilizers?

I imagine plane having only four flaps in the back (one on top, bottom, left and right), similar to ailerons but longer and narrower. They can open from the fuselage to correct the plane's yaw or ...
9
votes
1answer
1k views

Are there any fly-by-wire airliners with negative or near-neutral pitch stability?

Are any modern commercial airliners with fly-by-wire flight control systems designed with negative or near-neutral pitch stability so that they can take advantage of the capability of such systems to ...
13
votes
1answer
1k views

Are birds aerodynamically stable?

This question is bordering between aviation and biology. I am posting it here, since it is really about aerodynamics. At first, one would think, that birds should be aerodynamically stable to save ...
4
votes
3answers
2k views

What advantages are provided by an unstable canard configuration for fighters?

Why are most canard fighter aircraft unstable? A stable design would let the canard provide lift. My guesses are: Increase pitch rate Decrease stability while supersonic (supersonic, the aircraft ...
1
vote
3answers
5k views

Why should the centre of mass be ahead of the centre of pressure?

Why is the centre of mass located ahead of the centre of pressure? And what would happen if centre of mass would be too close or too far away from the centre of pressure?
6
votes
1answer
1k views

Does the 787 gust alleviation system make a more comfortable ride or for a more stable aircraft?

The 787 active gust alleviation system, similar to the system used on the B-2 bomber, improves ride quality during turbulence. Ride quality in a B2 bomber means a more stable weapons platform. Ride ...
1
vote
2answers
636 views

Are there any airplanes with the Centre of Gravity behind the Centre of Pressure? [duplicate]

We are used to seeing a forward CG in all airplanes, from a small Cessna to a large Boeing. I wonder whether any airplane with CG behind wing CP exists in production? Is it even possible? If so, what ...
0
votes
2answers
627 views

Is the physical MAX8 design bad because software is required for the aircraft to stay airborne? [closed]

I'm not an aviator by any means, but one thing that has come up in recent conversations with friends is that the MAX8 is inherently unsafe because alone, unpowered, the craft is not 'aerodynamically ...
2
votes
4answers
243 views

Would the front rudder of the Wright brothers really have helped in recovering the glider from a stall?

I have found a paragraph in the 1904 British patent of the Wright brothers (see the citation below) and it seems, from what they explain, that the two inventors believed the front rudder could have ...