June 1912, a plane without ailerons won the first place in Aspern - Wien airshow (Austria) for flying the smallest circle (Jane's All The World's Aircraft)
As late as 1912 there still were inventors, plane builders, who did not use ailerons and their flying machines excelled in making tight turns.
So, in the early years of aviation, ailerons were not considered as important as it was claimed by the Wright brothers and their fans.
1) "VLAICU Monoplane.
Designed by Aurel Vlaicu. First shown at the Vienna Exhibition, 1911. Modified; it flew very well indeed at Aspern, June, 1912. The 1912 model is of entirely novel type, a tail first monoplane with a propeller either end of the main planes, and a triangular tail aft. Principal details are:
Length, 34-2/3 feet (10.50 m.)
Span, 30 feet (9.15 m.)
Height, 12 feet (3.65 m.)
Wing frame in three sections with gap between.
Motor, 50 h.p., Gnome chain driven.
Fuselage, old style; landing chassis on three wheels only, with a single ash skid in front.
Covered in engine driving the 31 foot propeller shaft for the 2 propellers.
Rear tail consists of 2 fixed planes, a triangular damping plane and a triangular keel plane.
Forward, an elevator and two semi-circular rudders (double faced).
From this combination remarkable results are achieved, and all gyrostatic effect from the propellers eliminated.
Control, horizontal wheel on column. Elevator depressed or otherwise by action on column.
Note.—At Vienna, 1912, this machine took first prize for the smallest circle and also for accurate bomb-dropping."
Source:
The Project Gutenberg eBook of Jane's All The World's Aircraft 1913, Edited by Fred T. Jane
2) "His (Aurel Vlaicu's) airplanes lacked ailerons, relying on just rudder and elevators for control" (Wikipedia)
Aurel Vlaicu's airplane that did not have ailerons