Glenn Curtiss's 1912-1918 Model F biplane flying boat has large ailerons on the struts between the wings, not contiguous with any other flying surface. Did this aileron position have any advantage?
He knew about wing warping, so he knew the effectiveness of camber (hinging an aileron at a wing's trailing edge) as compared to just changing an airfoil's angle of attack. He knew how to make a hinge: this aircraft uses them at rudder and elevator.
He also knew about modern ailerons: in 1908 he flew an aircraft with them.
Maybe he chose such a large chord for the ailerons to try to increase their authority. Photos suggest that the airfoil was just a flat plate, which stalls at a deflection angle much less than that of a conventional aileron. But the drag from a stalled aileron that big would produce scary adverse yaw.