[kach22i]

Originally Posted by freebeard

All wrong. Viktor Shauberger showed this:

I think perhaps they were attempting to describe an internal application of the Coanda Effect.

Just a guess.

EDIT: found this........................

http://blog.modernmechanix.com/junio...del-dirigible/

Junior High School Students Build This Model Dirigible

FLYING on a swivel under its own power, this model dirigible shown above was made by members of a class in aeronautics in Hamilton Junior high school, Long Beach, California.

A vacuum cleaner fan and motor were attached to the model and propel it about in a circle at a rapid rate of speed. It was made of wood and metal at a cost of $750 to the school.

The model demonstrates the newly dis- covered principle of aircraft propulsion invented by F. Slade Dale. The rapidly revolving blades of a centrifugal fan whirl the air away from the bow center. This causes a partial lowering of air pressure at the bow and the atmospheric pressure on the rear portions of the ship drive it forward.

The miniature dirigible was built under the supervision of John Hodgson, former engineer and aviator, now an instructor.

Related:
http://www.formula1-dictionary.net/coanda_effect.html

The Coanda- 1910, the world's first jet aircraft

Getting back to automobiles..........................
http://www.evilution.co.uk/830

However, with the tab in place you can kick the air up enough to reduce the Coanda effect.
This disturbance also causes a wake behind it which, using the Bernoulli effect,
collects other streams of air and pulls them up and away from the cabin too.