Linked Questions

29
votes
4answers
32k views

How do conventional and T-tails differ?

What design considerations go into the decision between conventional tails and T-tails? Functionally the horizontal stabilizer/stabilator are the same in both cases, providing negative lift, the ...
16
votes
3answers
32k views

Are there advantages when operating with CG near forward or aft limits?

If the center of gravity of an airplane is too far aft, it will become more unstable Iif the CG is too far forward, then drag will increase due to increased angle of attack. But what are the ...
9
votes
4answers
3k views

Do all aircraft need to have horizontal and vertical stabilizers?

Are (or were) there any operational aircraft that don't have horizontal and vertical stabilizers or canards? If so, what's the effect on how they fly?
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 ...
8
votes
5answers
3k views

Can a plane with 2 sets of shorter wings fly?

I am proposing a plane that has 2 short wings of the same size on either side of the fuselage (two in the front and two in the back). Rather than using the horizontal stabilizer to destroy lift, the ...
7
votes
2answers
1k views

Why does aircraft stability increase when it transitions from subsonic to supersonic flight?

I am puzzled why would the aircraft be more stable at high speed flight at high altitudes. Given that the Centre or Pressure moves gradually towards the 50% MAC region, once past Mcrit. Has this got ...
6
votes
3answers
11k views

Should the pitching moment be up or down?

I had a question regarding the direction of the pitching moment. To make sure we are on the same page, here is what I know so far (please correct me if I am wrong). Lift acts through center of ...
6
votes
3answers
7k views

What is the function of the tail section on a fixed-wing aircraft? [duplicate]

In a generic fixed-wing aircraft like a Cessna, what is the function of the tail section, i.e. the rudder and elevators?
6
votes
2answers
1k views

How to trim in level flight when speed increases?

What is required to happen to control surfaces and trim tabs to remain trimmed in straight and level flight, as speed increases? (for a GA propelled aircraft) My manual tells me that the elevator ...
6
votes
4answers
985 views

Do aerodynamic forces and moments change aircraft pitch and yaw in the same way?

Several questions on the Aviation SE site have dealt with the question: can the rudder alone turn the aircraft: This one, which was marked a duplicate of this one, which was itself marked as a ...
5
votes
3answers
959 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 ...
5
votes
3answers
2k views

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 ?
5
votes
1answer
12k views

Where is the best center of gravity?

I'm designing a plane, and I have a question. What is the best place for the center of gravity, relative to the center of lift? I've heard that it's best put just behind the center of lift, but I ...
4
votes
2answers
165 views

Calculate pitch balance of RC glider?

Today, I played with styrofoam gliders with my kids; I made an asymmetric wing, asymmetric horizontal tail, symmetric vertical tail, and attached these to one stick for the fuselage. I've had big ...
3
votes
5answers
640 views

Can thrust vectoring be used to enable the use of flaps on tailless delta-winged aircraft?

I'm considering flying wings as well as airplanes with only vertical stabilizer for their compact size, efficiency and high speed. As I can't find a working example of such scheme, theoretical ...

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