mah wrote:

Tarver Engineering wrote:


The sole reason for using a static port is so the guts can be removed from
the pitot tube, in order to improve reliability. A pitot port produces no
static pressure datum.


Just as an example, when the aircraft is sitting still on the ground -
airspeed = 0. Since the pitot and static ports are in the same state,
doesn't that imply that static pressure is present at the pitot port?

MAH

Sure it's there, but it's there only until the a/c starts to
move. It's then no longer 'static pressure' because it's been
raised by the ram effect of the movement.

That's why you now need a 'static port' to supply the static
pressure to use as a reference. Is it really that difficult to
see?!?
--

-Gord.