That makes it easy ------

My grandfather knew a man who dated the daughter of the designer - he told him from her as told by him that the ailerons were of the Frise design. It seems that they were all the rage at the time in the small town of Frise, Germany. All of the airplanes had to have them to be in style. It was a socially acceptable thing to do along with the fringes that were put around the bottom of the fuselage (they were supposed to reduce drag by half as a result of waving in the breeze, creating thrust vortexes).

Somebody actually tried to use a conventional aileron but soon found that the local air was so accustomed to reacting to the Frise type that the air didn't know what to do. Unfortunately they got so confused that they made the airplane pitch and it landed the unfortunate pilot into a hay loft.

To this day all of the airplanes in the town of Frise have always used the Frise aileron design.