Where can I find pictures of "endplate"?
I seem to remember that wing end plates were sometimes used on Short Take Off and Landing(STOL) aircraft in the 1960's.

I found a few photos while doing an internet search but they seem to be much more prevalent on race car wings these days. 











Here is an explanation of why end plates are used on race cars: Analysis: Rear Wing Endplates


  The endplate has two functions, the primary reason for their shape is
  to control the wingtip vortices at the trailing edge of the wing as
  this reduces drag and also lift. The second reason is that they
  control how the airflow makes its way over, under or around the
  aerofoil device that is creating the downforce on the car, resulting
  in better airflow management and maximising the performance of the
  component.