Because the wings are shaped in such a way that lift is only created during forward motion. Look up the Bernoulli Principle.
When air or other media, like water, moves over a surface shaped in a way that allows the media to travel faster over the upper surface, producing lower pressure on the the opposite surface; the upper surface is pulled up, just like a wing or to the side, in the case of a special type of keel used on racing yachts.
Will not work going the other way.
Fly backwards
The Harrier Jump Jet
you cant
yes, a current of air forced backwards causes the air craft to move.
No, it can't go backwards
No because it cant be said the same way backwards 1936 backwards is 6391 ex: Hannah backwards is hannaH
Jay bird
Fly backwards.
Some military aircraft can truly fly backwards, most common examples would be the Harrier or Osprey. Some acrobatic aircraft can appear to fly backwards, usually by some form of controlled stall maneuver, but this does not actually fit the definition of "flying backwards".
does the clock go backwards
there is no reverse gear but ..... it has ... thrust reverser is equipped in the jet engine which moves the aircraft backwards even faster
yes that's why they cant swim backwards