Aerodynamics
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Aerodynamics
Tuesday, May 18, 2004 (9:50 AM)

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Posted by
WinZSoe (42)
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Aerodynamics
According to Aerodynamics Theory, the Airplane fly at a constant speed when Drag and Thrust acting on Airplane are equal.

I don't understand it. I think if Drag and Thrust equal , Airplane will stop, right? But Aerodynamics Theory states that Airplane will move in a constant speed, Why? What do you think of it ?


Posted by
hello (109)
Edit
RE: Aerodynamics
Posted: July 3, 2004 (11:30 PM)
It is called (aero) dynamics for a reason. There are other dynamics in this world.
In order for anything to start moving - it needs acceleration (a push).
When the object reaches any speed if acceleration stops (meaning that drag equals thrust) - object will remain at constant speed.
That's why they say when drag equal thrust - airplane will remain at constant speed.
If you apply extra drag - aircraft will start to decelerate to the point when drag equals thrust.
If you remove the thrust - aircraft eventually will stop (stall, crash etc.).

Take another example. Ask two of your friends to push you from both sides. If you remove one of them - you probably will fall. This is example of static, which converted to dynamics when you remove one of your friends.
Static and dynamic theories go side by side and very relative to each other.
Say you driving on a highway. If you going side by side with the other car - you go static relative to that car even though both of you could be doing 60 at the time. You are both dynamic relative to the highway and static to each other.
There are tons of examples and in many of them you need to use your imagination.
I hope it answers your question.

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