He not only just flew, Vlaicu, flying without ailerons, took the first place (for performing the smallest circle) in a competition with 42 participants (42 planes). This is quite important. His aeroplane, without ailerons, behaved better, in making tight turns, than the other 41 of various types. That man, Vlaicu, built a highly maneuverable airplane which was stable and perfectly steerable up, down, left, right.
For the early planes, ailerons were more a gadget than a necessity.