X-Mozilla-Keys:                                                                                 
Vance Jaqua wrote:

HEY! give them a break and take a second look - since we all agree that
negative pressure is a no no the integrated pressure area term on the
top of the air foil is a positive force downward - now if this is a rag
wing the inside of the wing is roughly static and higher than that
outside pressure - and indeed will try to lift the fabric off- However
looking at the foil alone (or solid) what they said is perfectly true -
the top is being pushed down, and the botom is being pushed up harder -
Vance ( not a usual NASA defender)

Well if you want to talk in terms of absolute pressure yes it is pushing
down. 

I think it would be easier to visulize for the average high school
student if he thought in terms of relative pressure.

They did a good job on this web site but I suspect the cost benefit
is not there given the number of highly paid people working on
it. I think a small private educational software publisher could have 
done equally well for far less money. Why is NASA doing this sort of
thing anyway? Are they the only people in the world that know how
an airfoil works? I don't think so.

We have plenty of less sexy problems in GA they are not working on.
Take the rotary engine or just the good old GA piston engine for 
an example. The diesel engine programs seem to be going nowhere.

Paul Lamar
 
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