Linked Questions

0
votes
1answer
172 views

Is using flaps the same as increasing the AOA? [duplicate]

The purpose of trailing edge flaps is to give the aircraft more lift at lower speeds. But do simple flaps beneficent more than increasing the angle of attack? The image looks like part of the wing ...
11
votes
5answers
2k views

What is the point of making one control surface play the part of multiple control surfaces?

For example, flaperons (flaps + ailerons) and elevons (elevator + ailerons), are all individual control surfaces but play the roles of two different control surfaces. What is the point of making a ...
7
votes
4answers
2k views

Why are the wings of some planes changing width?

I was travelling recently in a Boeing 737 and I noticed one thing that I didn't understand. After the takeoff the wing flaps started retracting into/under the wing, making it narrower. The opposite ...
8
votes
4answers
3k views

Why are the wings of some modern gliders tadpole shaped?

Why are the wings of some modern gliders tadpole shaped, rather than teardrop shaped? An example is the Schleicher ASG 29. Or did they just add a flat plate at the trailing edge for the flaps and ...
7
votes
2answers
2k views

Do negative flaps increase glide ratio?

If I understand correctly, gliders uses negative flaps while crossing between 2 thermals, but I don't understand why. For me: positive flaps decrease sink rate but increase drag and thus worsen glide ...
8
votes
3answers
723 views

Aerodynamic advantage of blunt noses and WHY (subsonic)

Compared to a sharper conical nose, a blunter conical nose is aerodynamically superior in subsonic flight. My question is why. I've read a lot about this and allegedly: A blunter nose accepts a wider ...
4
votes
3answers
3k views

How do I choose the correct airfoil?

I am currently working on a personal single seat, piston aircraft that I would fly myself and I am currently in a bit of conundrum when it comes to my wing design. In this project, I assigned us in 2 ...
7
votes
2answers
1k views

Does the aerodynamic center move when flaps and slats are deployed?

Does the aerodynamic center of an aircraft move when flaps and slats are deployed? I am trying to figure out if the AC of an aicraft moves with landing and take-off configurations. I know Cl and Cm ...
3
votes
2answers
579 views

Why is the critical AoA of most flaps 40° when most airfoils stall at 15°?

A plain flap deflected 40 degrees is largely stalled (...) Flaps stall at 40° according to an answer on Quora, why is this so when typical airfoils stall at 15°?
5
votes
1answer
1k views

Why and how do flaps increase the curvature of the wing?

Why or how do flaps increase the curvature of the wing? Do they alter the curvature of the upper surface of the wing?
2
votes
4answers
748 views

How does setting takeoff flaps improve aircraft performance?

A study guide I recently found indicates that Vmc and aircraft performance improve with takeoff flaps set. The Vmc improvement makes sense but the performance improvement does not. At a basic level, ...
2
votes
1answer
2k views

How does leading edge flap increase camber?

From this post, I've learned that the leading edge flap works by increasing the camber of the airfoil. But how exactly does it work? Since it is a flap, I can guess it works by changing the chord line,...
3
votes
2answers
129 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 ...