On Wed, 31 Dec 2008 17:54:44 +0000, Goofball_star_dot_etal
wrote:

"The work done by accelerating the mass of air downwards is exactly
equal to the work required to keep the aircraft aloft." - Roger Long

"Lift on any foil acting in a fluid (whether air, water, or any other
fluid) is totally depended on VISCOSITY. Without viscosity there can
be NO lift." - Rich H

"How Wings, Sails, Keels, and Rudders Really Work. "
http://forums.sbo.sailboatowners.com


I suppose that Goofball imagines that Roger Long is contradicted
by Rich H. That is not in fact the case.

On the one hand, Roger is not quite right, because some of the work
done in accelerating air downwards is lost to turbulence (i.e warming
the air mass):
on the other hand Rich H's assertion is much less insightful than it
sounds, because, strangely enough, EVERY fluid has some measure of
viscosity, same as they all have mass. (In fact substituting mass
in place of viscosity makes even more sense!)

In a word....Goofball's contrast reminds me strongly of Wilbur's
strident support for the sulfation spelling, in absolute ignorance of
the existence of the equivalent spelling sulphation. I don't suppose
Goofball is yet another puppet of Wilbur's is he?

BrianW