Re: curve balls, airfoils, greenhouse effect

["Daniel L. MacIsaac" <Dan.MacIsaac@nau.edu>]

> I'm not ready to give up Bernoulli on airfoils yet either.  Again,
> calculations give reasonable numbers, and I really haven't heard or seen a
> description that negates Bernoulli as a _major_ factor in LOW SPEED
> airfoils--again such as those used with human-powered craft.  I also wonder
> about ultra-lights.  To be sure, I've always raised the question of how can
> airplanes fly upside-down with my classes and therefore get at attack
> angle, conservation of momentum contributions.
....you can also ask traditional bernouilli questions like the lift force 
on a roof with a wind blowing over it, or Torricelli questions derived 
from Bernouilli.  My students really like the lift force on roof-type questions.

Dan M