Fly Lah!

yeah....the discussion's getting more interesting. If we read several books, we'll find out that this subject depends a lot on author him/her self. It would be a little bit different in their idea... well it is just a theory of flight. No hard false and true. Anybody in forum can still give his/her point of view or what they know more. The most important is understanding. That's it.

I try to be at the level of ATPL students on what we are teaching in a FTO.
Yes there are more advanced theories.
- Bernouilli theorem is working only at subsonic speed
-There is a "differential" Bernouilli equation working in transonic
- For supersonic you have to use "Lord Raleigh" equation
And above all, another mathematical concept of aerodynamic: the Joukowsky theory....(Which can explain why a golf ball is flying...)

For those who like mathematics:
http://en.wikipedia.org/wiki/Joukowsky_transform

mosumo wrote:yeah....the discussion's getting more interesting. If we read several books, we'll find out that this subject depends a lot on author him/her self. It would be a little bit different in their idea... well it is just a theory of flight. No hard false and true. Anybody in forum can still give his/her point of view or what they know more. The most important is understanding. That's it.

It can only be true or false. No two ways about it. Stick to what Terengganu01 posted, its almost a complete explanation about stall.

m732 wrote:
It can only be true or false. No two ways about it. Stick to what Terengganu01 posted, its almost a complete explanation about stall.

sorry for the inconvenience statement. What i mean is, sometime if you want to say something is false, you hard to say it because it may cause a conflict...that's what i mean. Same as if you want to say true, it may not be very true. To avoid confusion, books are the remedy

Air begin to burble over the top of the wing when the wing reaches a large angle of attack. This burbling distrups the flow of air over the wing, interfering with lift and hence causing a stall.The angle at which the air begins burbling followed by the wings stalling is known as the critical angle of attack.

Remember, according to Jacob Bernoulli, lower-velocity airflow over the wing produces less lift.All wings have a critical angle of attack (the angle varies slightly among airplanes). Beyond this angle, the wing and the wind dont work and play well together. This is the simple explanation, Terengganu01 post has the detailed one. All whispered theory in your heart wont overcome the laws of physics and aerodynamics. So dont defy them

mus_smart wrote:Air begin to burble over the top of the wing when the wing reaches a large angle of attack. This burbling distrups the flow of air over the wing, interfering with lift and hence causing a stall.The angle at which the air begins burbling followed by the wings stalling is known as the critical angle of attack.

Remember, according to Jacob Bernoulli, lower-velocity airflow over the wing produces less lift.All wings have a critical angle of attack (the angle varies slightly among airplanes). Beyond this angle, the wing and the wind dont work and play well together. This is the simple explanation, Terengganu01 post has the detailed one. All whispered theory in your heart wont overcome the laws of physics and aerodynamics. So dont defy them

yepp...i hear you friend... you say it twice already. nothing for me to worry about, because DCA wont ask me too much.. ehhe.

Eh guys,

The DCAT: yes, most of the questions are well known. But, aerodynamics/ principles of Flight are one of the core subjects you have to master in your professional life in order to understand what you are doing when you fly your aircraft. You are not working hard only for an exam, but mainly to acquire the fundamentals for your entire professional life.
Later on, in the simulator during the type rating, your Airline instructor will ask you some second level questions, if you do not have the foundations it will be difficult to answer ....
And soon the JAR exams.... a little more complex than DCAT.
Terrenganu01

But mostly of the plane starts to stall at the root of wing. If stalling starts at the wing tip, pilots will be trouble. Correct me if i'm wrong.

The way the wing stall depends on the Planform.
rectangular stall at the root first but elliptical wing (spitfire) the stall occurs on all the wing simultaneously.

But differnet aspects nds to be consider if the wing stalls at the tip or root. Nwadays commercial airplanes uses geometrically washout and aerodynamically washout to prevent aircraft stall at the wingtip. Becuse if aircraft stalls at wingtip, pilots will be in trouble of rolling the plane by moving the aileron. Correct if i nt mistaken.