To avoid the problem of vortices the above two solutions are given by the engineers. The first was to make long wing to completely avoid the airflow from lower to the upper wing. It was not a solution to be even considered. The second was to make a component that would separate the two different pressure regions. That was a great idea and was accepted.
Do all the airplanes have winglets now?
Well, it is now made compulsory for all the airplanes to have a winglet now.
You can test it too!
To test the importance of a curved end try to make an airplane. Make sure it has curved wings like shown in the picture above. You are going to witness such an incredible difference. You will notice that it flies longer than the place you made with straight wings.
