First helicopter landing on Mt Everest

"Mike Rapoport" wrote in message
k.net...
I don't think that wave lift is described as orthographic.

That's "orographic".

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

Wave only happens as a result of orographic lifting. IMHO, the fact that
some of it occurs downwind of the hill is irrelevant to the fact that it's
part and parcel of the whole effect of the hill. The ridge lift is simply
the first bump in the whole wave.

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.

The wave lift downstream of the hill is just a single component of an entire
phenomenon. It's just an updraft portion of a complete wave system, a
system that starts upwind of the hill.

Pete