anyone know the name of an old sailplane short film

I wasn't even born when "The Sun Ship Game" came out and I still
think it's the best film about soaring ever made (and I've watched a
hell of a lot of them!). It's like "The Endless Summer" with wings.
If you get a renowned, prize winning documentary filmmaker interested
in soaring, get people to invest a few million dollars (knowing
they'll never get back more than a few percent of it) you could
probably produce a film as good as it today. The music, fashion and
the gliders would be different but the essence would be pretty much
the same.