Thread: Lift over foils
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JAXAshby
 
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Default Lift over foils

jim, the 'bernouli's" say the air is one unit at the leading edge of the wing,
and because it travels a shorter distance along the straight bottom surface
than the longer top surface it therefore means the air along the top *had to*
speed up to "catch up" with the air on the bottom, therefore less pressure.

This is not true. it does not HAVE to.

The most efficient wing surface out there is a thin sheet shaped into an "S",
with the top forward part of the "S" the leading edge and the bottom rear part
the trailing edge.

Indentical distances for air to travel and the most lift available for the
drag. (problem: andy particular "S" only works for one airspeed)

Instead of thinking of "low" pressure and "high" pressure, think of what low
and high means. high has more air molecules pressing against the surface at
higher molecular speeds. low has fewer molecules and/or lower molecular speed
of those molecules.

To create lift (by changing the momentum of the passing air)
there must be low pressure above the wing compared to the
pressure below the wing.


reword this using impact of molecules instead of low/high pressure and see what
happens.