posted on Dec, 13 2017 @ 02:17 PM
a reply to: Indrasweb
The system is doing two things. Its literally changing the direction of the exhaust stream coming out the engine nozzle. This allows for steering.
Its kinda like if turn on a hose of water and stick your thumb on the edge of the nozzle and the water squirts more to the left. In this case air is
acting like the thumb. If the exhaust is being pushed to the left the vector (line) of thrust is pushing more to the right which would in turn steer
the aircraft more to the left. So it functions like a rudder. This part of the BAE system is called Fluedic Thrust Vectoring. Because you are using
a fluid (air) to push the exhaust into a direction and via that vector the thrust. In other words the injected slower moving air on one side of the
exhaust nozzle creates resistance to the exhaust which will flow away from it and in a desired direction for steering.
The second part about the air on the wings is basically causing turbulance and drag by un even air flow to disrupt lift or increase it over certain
parts of the wing allowing banking the same way a flap or aileron on a aircrafts wing does.
Keep in mind a wing works by creating a difference in air pressure between the bottom and top of the wing. Air pressure is caused by the speed the
air flows. Faster moving air has less air pressure. Slower moving air has more. The wing is flat on bottom and curved on top. The wing is
travelling through the air at a certain rate of speed. The air travelling along the bottom where its flat goes a shorter distance than the air having
to take the curved path over the top which is a longer distance. The only way for the air to get over the top and make its way to the back at the
same time as the air on the bottom is to speed up thus lowering its air pressure compared to the air on the bottom. This creates a force pushing up
on the underside of the wing. A good example of this phenomena of air speed causing pressure differences is with your window. Close a window when
its windy outside. Cause the air outside is travellung faster than the air inside the house the still air inside has more pressure and it pushes out
on the window. So when a gust of wind blows past outside your window forcefully ushes out due to the sudden higher pressure inside and you hear that
familiar "thump!!" as the window bangs against its frame.
So with this BAE system:
Basically you have a smooth airflow going over the top or bottom of the wing. This system injects slower or faster moving air over a part of the
bottom of the wing disrupting the air pressure there by causing turbulance and that will cause that wing to loose a little bit of lift and drop down
making the plane bank in that direction.
Or it can do the opposite by injecting the air over the top of the wing and change the air pressure there and cause more lift on that wing causing it
to rise up making the plane bank the other way.
edit on 13-12-2017 by BASSPLYR because: (no reason given)