I don't think that wave lift is described as orthographic.

Wave is a gravity/compression phenomonon and ridge lift is just wind being
forced up hill.

Another distinction is that wave lift at mountaintop level is several miles
downwind of the mountain and ridge lift is upwind and immediately adjacent
to the lifting surface.

A great book on waves and soaring in them is Exploring the Monster which
chronicles the Sierra Wave Project in the 1950s.

Mike
MU-2


"Peter Duniho" wrote in message
...
"Mike Rapoport" wrote in message
nk.net...
I was thinking more about ridge lift. I know that ridge lift has been
used to fly 152s over Mt Kilimanjaro 19,000+'

Heh...I lump that in with wave. It's all orographic lifting, right?

I can see why some folks would prefer to not use the terms
interchangeably, or in a sub/superset relationship. I don't generally
make a distinction though; anywhere the wind is affected vertically by
topography, I refer to as "wave".

In any case, even if some meteorological phenomena was used (whatever one
might want to call it), it's still a pretty impressive demonstration.

Pete