Altimeter Calibration Height

if you mount an altimeter at the 100' level of a 200' tower,
equiped it with a static tube 100' long,
that the altimeter will read the same regardless if end of the tube,
is stationed at the top or bottom of the tower.

That is a mostly true statement. Conditions inside the tube could
differ from ambient conditions, this would engender a teeny (but real)
difference in readings.

Jose
--
Get high on gasoline: fly an airplane.
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"Jose" wrote in message
. ..
if you mount an altimeter at the 100' level of a 200' tower,
equiped it with a static tube 100' long,
that the altimeter will read the same regardless if end of the tube,
is stationed at the top or bottom of the tower.

That is a mostly true statement. Conditions inside the tube could differ
from ambient conditions, this would engender a teeny (but real) difference
in readings.

Jose

You mean like pressure loss of the long length or something?

if you mount an altimeter at the 100' level of a 200' tower,
equiped it with a static tube 100' long,
that the altimeter will read the same regardless if end of the tube,
is stationed at the top or bottom of the tower.

That is a mostly true statement. Conditions inside the tube could
differ
from ambient conditions, this would engender a teeny (but real)
difference
in readings.

Jose

You mean like pressure loss of the long length or something?


Humidity or moisture content comes most readily to my mind.

Peter

You mean like pressure loss of the long length or something?

The conditions inside the tube are different from the conditions outside
the tube. I expect they'd be very similar, but given a very long, very
insulated tube, which starts out with (say) dry air, followed by the
passage of a moist front, there would be a difference.

Jose
--
Get high on gasoline: fly an airplane.
for Email, make the obvious change in the address.

"Jose" wrote in message
t...
You mean like pressure loss of the long length or something?

The conditions inside the tube are different from the conditions outside
the tube. I expect they'd be very similar, but given a very long, very
insulated tube, which starts out with (say) dry air, followed by the
passage of a moist front, there would be a difference.


Agreed, and even moisture would be a factor as Peter suggested.

By the tower example I was just trying to verify that the altimeter measured
presssure based on it's location, not the location of the static port, with
the exception of errors caused a longer or shorter length of hose to the
port.