Help- How the values for tails will become after wing interaction

[lisamaverick]

Hello guys:

After the air flowing past the wing of an aircraft, the flow will hit the horizontal tail and vertical tail.

I am wandering how the angle of attack and free stream velocity will change? How much of the values I should use for the tails?

Thanks a lot.

Lisa

 

[israelkk]

This is why a wind tunnel is used to find interaction and the affect on air flow of the body on wings, tails etc. and vise versa. You could use a CFD analysis but at the end only wind tunnel tests will give the best results before final actual flying tests.

 

[KENAT]

Simplistically one factor is that the tail will effectively be operating in a downdraft, if I remember correctly from school!

A good mechanics of flight book may give some usefull info. Barnes McCormick I think is what we used.

KENAT, probably the least qualified checker you'll ever meet...

 

[lisamaverick]

israelkk, KENAT:

Thanks for your posts.

I am wondering if there are empirical factors for the changes.
Such as the angle of attack will be half, and the free stream velocity will probably keep constant.

Lisa

 

[KENAT]

Maybe take a look at model aircraft books or websites.

Mechanics of Flight in Wikipedia

http://en.wikipedia.org/wiki/Aircraft_flight_mechanics

KENAT, probably the least qualified checker you'll ever meet...

 

[KENAT]

http://en.wikipedia.org/wiki/Downwash

I can't remember if it's covered in Aircraft Design by Dan Raymer, may be a good place to look if you have a copy available.

It gives a lot of empirical factors for initial estimation of these types of things.

http://www.aircraftdesign.com/

Beware, if your username has anyting to do with working on missiles, I'm not sure it would give much directly relevant information as it deals with aircraft.

KENAT, probably the least qualified checker you'll ever meet...

 

[israelkk]

lisamaverick

What kind of aircraft are you dealing with? What is the MACH number of the aircraft. Fast aircraft beyond the sonic speed behave completely different for sub-sonic airplanes.

There is a series of 7 or 8 volume books from Dr. Jan Roskam dealing with airplane design maybe you can find something their.

 

[lisamaverick]

Hi Guys:

I am dealing with the normal commercial aircrafts. Especially A380, A320, B747 and B737.

KENAT, thanks for your information. I will go though them now.



Lisa