Why isn't "static" pressure speed-dependent?
This is something that has always puzzled me and probably derives from an incomplete (or just incorrect!) understanding of Bernoulli's Theorem...
Why doesn't the pressure in an aircraft's static system vary significantly with speed? I'm thinking particularly of something like a C152 whose static port is flush with the side of the fuselage just in front of the left-hand door. According to my limited understanding, Bernoulli's Theorem says that the pressure exerted by a moving fluid will be less than that exerted by the same fluid at rest, because some of the fluid's energy has been transformed to kinetic energy.
Therefore, the pressure sensed by the static system should fall as the aircraft's speed increases. However, if that were really the case, I'd see my altitude dropping as I accelerated from rest on take-off! What's going on?
Any pointers appreciated!
Cheers,
cbl.