Question to Mxmanic
Anthony, you've got the issue of compressibility precisely backwards. No
surprise.
Rip
Mxsmanic wrote:
Rip writes:
I don't know, but I'm going to find out! I can envision an aircraft with
light wing loading, like a Cessna for instance, compressing the air
locally as it creates lift. After passage of the wing, the lift created
downwash would rebound upward, kind of like skipping a stone on the
water.
Virtually no compression occurs at the speeds of a Cessna. Compression is
only an issue at high speeds. At low speeds, air behaves very much like an
imcompressible fluid.
The end result is that the downwash stays at a constant altitude,
or sinks MUCH more slowly than theory would indicate.
The downwash does not stay at a constant altitude. It sinks. It has to,
otherwise the aircraft couldn't stay in the air.
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