I-16 tip 4 and 5 models had flapperons (mixed flaps and ailerons) with fences running all wing long. Small 8.88 m wing span supported by two extra rigid khrome-molybdenium welded tubes spars.
From 1934, tests it took 1 -1.2 secunds only for a 360° barrel!!!
I've heard German pilots weren't allowed to get into a turning fight with them. Very few German pilots could match them in 109s in a turning fight. Most of the time they used hit and run attacks with the much faster 109s.