Try Simviation, FSX Military, Page 6. for FS2004/FSX Dassalt Mirage G8 Package Version 3,

Zip file:   Mirage_V8_G3.zip

Hit "L" for lights to get the after burner to glow.   

The wings oscillate from fast position to slow.

Have fun!    DB

if it matters i got the F-14 blue angels pack for FSX from this site

so if that helps?

yeah im pretty sure i have

its part of the effects and there should be an effects file with the plane you download that needs to be placed into the effects folder within FS.

I have noticed sometimes it links itself to the lights switch which it should not , and simply re-selecting the aircraft usually will reset the effect so as it just appears at full throttle and goes away when you back the throttle down a little (like less than say 80-100%)

looking at your question again, are you asing more for an explantion of what they are in real life ?   In effect they boost your power by a bunch but it cost alot of fuel , is really only used sparodically in combat , most Mil jets will have a "full military power" throttle setting which is with the afterburners off.

In real life , most Mil jets will operate at 500-650 knots without the after burner , though we are now seeing the F-22 which was designed to have a "super-cruise" capability to operate faster than this for longer distances than was traditionally the case.