Linked Questions

15
votes
4answers
9k views

What are the advantages of a Trimmable Horizontal Stabilizer?

What are the advantages of a Trimmable Horizontal Stabilizer (THS)? For example, a THS is used on some Airbus and Embraer aircraft. What is the most important advantage, and why don't some other ...
14
votes
4answers
2k views

What are the reasons to evolve from trim tabs to moving the entire surface (e.g. stabilizer)?

Modern commercial aircraft use stabilizer to trim instead of trim tabs. What are the advantages and disadvantages of this design choice? Have aileron trim and rudder trim evolved in a similar way to ...
16
votes
4answers
3k views

Why are swept wings better for breaking the sound barrier?

I'm told that swept wings perform better when an aircraft is trying to break the sound barrier. I was wondering why that would be?
10
votes
2answers
1k views

Will control surfaces on a plane be less efficient at a higher altitude?

I may be wrong but I learned that control surfaces depends on the air flow to work properly, and that airliners have a higher cruise altitude because of the less dense atmosphere, improving the fuel ...
5
votes
1answer
8k views

What is the chord of a wing?

In the answer to this question the author mentions the chord of a wing. What exactly is that, and how is it used in wing design?
7
votes
1answer
1k views

Why are aircraft designed so that the wing stalls before the tail?

I read somewhere that conventional aircraft are designed so that the main wing always stalls before the tailplane. Why is that? My concern is that if the wing stalls, suddenly the tail will push the ...
9
votes
2answers
2k views

What are the pros/cons of all-moving rudder?

All-moving flight control surface (stabilator instead of a stabilisator+elevator) are common on supersonic aircrafts but this is usually used for pitch control only. For rudder, this design (one all-...
4
votes
1answer
2k views

Why most of the supersonic or fighter aircraft use all-moving control surfaces?

What are the advantages of using all-moving control surfaces? can someone give explanations based on aerodynamics?
4
votes
1answer
805 views

Is setting elevator to certain angle equal to trimming the horizontal stabilizer?

(I was trying to understand the longitudinal stability of aircraft and how it is related to elevator) If I pull the stick back by, say 2 inches, will it have the same affect as trimming the ...
3
votes
2answers
127 views

Is there any way to estimate the weight difference between a trimmable horizontal stabilizer and a fixed tailplane?

I am trying to estimate the benefits of using a trimmable horizontal stabilizer (THS) instead of a fixed tailplane. In my model I use a T-tail (Sh~30 m), and I can trim the aicraft in every condition ...