how dose an aircraft fly up sidedown?

Answer 1

First off, not all airplanes can do that safely. But acrobatic planes certainly can. Many others can FLY like that, but without the right engine, the engine is starved for oil when inverted. That would be bad.

While aircraft are optimized to work best right side up, you could actually fly sort of okay with slabs of wood for wings (if they were decently streamlined) as long as you have enough control authority in your aerilons and elevator (aka horizontal stablizer).

If the wing has an angle-of-attack of 5 to 15 degrees (depending on design), it will make enough lift to hold up the plane at manuevering speeds. In a high-speed cruise, a few degrees does it in some planes. At landing, a higher angle of attack of 20 to 25 degrees depending on the airfoil is used.

That is still all true upside down (but don't land that way!). The position of the elevator (that small horizontal wing on the tail) determines the angle of attack of the main wing.

So just like uninverted flight: The main wing generates lift equal to the wieght of the aircraft, the engine generates thrust equal to the drag of the aircraft. And the elevator maintains the main wings' angle of attack at a steady angle.

Or, more fundamentally: Even inverted, the air takes a longer path over the top of the wing and therefore goes faster. Faster air is lower pressure air (so sayth Bernoulli) and the difference between the high pressure air below versus lower pressure above provides the needed lift.

Answer 2

Just by rolling it over by moving the ailerons.
Ailerons are the control surfaces on the trailing edges of the large wings & moves in opposite direction to each other to make the aircraft roll. When the aircraft is inverted the pilot holds the elevator in downward position, with that position of elevator the aircraft goes downward when its in normal straight position.

Answer 3

Big planes usually can't fly "inverted" only smaller ones. To fly inverted, the nose must be "pitch" up a bit then use the aileron or wing surface to spin the aircraft upside-down holding position.

Answer 4

after going fast enough, some planes, jet fights, no longer act like plane a behave like rockets and do not need wings to stay in the air.

Answer 5

Principles of flight operate and apply the same way.
It's just inverted, that's all.

Answer 6

They use their ailerons.