In article .com,
"Jack Linthicum" writes:
Avril Poisson wrote:
The Role of Lift Demons and Thrust Pixies in Heavier Than Air Flight
Publication Date: April 2005

Abstract: The role of Lift Demons in aeronautics was first explained
in 1994
by Mary Shafer (NASA). Since then, Shafer's work has been explored
and
revised. This paper summarises advances in Lift Demon technology over
the
last decade.
Then the explanation I got in 1959 that it involves mass hypnotism
isn't true?

That's part of the Special Rotorcraft supplement:
"Optical Illusions with Sound Effects", Sikorsky, Piasecki, Kamen,
Hiller, Bell, Ceirva, Focke and Breguet, 1940, the FM Press.

--
Pete Stickney

Without data, all you have are opinions