Albert Einstein designed an airfoil!
It was based on Bernoulli's principle only, without understanding circulation. It was a very poor airfoil! It was called the "cat's back airfoil", and the theory was it would work like a venturi, and generate lift at zero angle of attack, without the other side or a plate down the axis of symmetry. The top was intended to generate suction, the bottom to generate pressure, all with low drag.
It was tested at Gottingen, and even flown. The flying characteristics were described as being like "a pregnant duck".
There are a few pages about it in this book, starting on Pg. 3 I think:
The coordinates were lost during bombing in WW2.
There is a good description in the "Enigma of the Airfoil", by David Bloor, which I got for Christmas. I've really enjoyed reading the book which goes through the entire history of the development of wing and and airfoil theory in Britian and Germany from the 1800's to 1930.