F.L. Whiteley wrote:
which?

"Jack Glendening" wrote in message
link.net...

My thanks to all who responded. I am going to use two of the diagrams,
one to illustrate soaring lift over a ridge and another to illustrate
dangers to aircraft downstream of a ridge.



One that Peter Deane sent to me outside RAS and one that I altered heavily
from the French version http://www.drjack.net/TEMP/ridgeflow.png