On Thu, 26 Feb 2004 13:23:52 -0800, "Tarver Engineering"
wrote:


"Robert Moore" wrote in message
.7...
fudog50 wrote
IIRC, the only indicator that had both pitot and static inputs
was the VSI/Rate of climb indicator and the internal bellows in the
gauge performed the differential action. Airspeed has pitot inputs
only. Baro Alt. has static port input only. Wish I could draw you a
diagram on here, it would explain everything.

Ummmm.....I think that you definately DO NOT recall correctly!
Static Pressure feeds Altimeter, Airspeed, and VSI.
Pitot Pressure feeds only Airspeed.

The Pitot Pressure from the Pitot Tube is a combination of Static
and RAM pressure.

You remember wrong, as usual, Bob.

IAS is one pressure subtracted from the other.

Which is exactly what Robert said in the bit you snipped. To wit:

"The bellows inside the airspeed indicator uses the ambient static
pressure from the static port to cancel out the static component from
the Pitot Tube leaving only the RAM component to move the airspeed
needle."

Since the 1960s, large airliners have used a pitot port and a static port.

Please provide one reference for this.

The Bombardier GBX being a notable exception to modern pitot/static systems,
with it's prominent nose boom and pitot tube.

Ok...So a pitot tube only exists on a nose boom?

And Bombardier GBX? Are you referring to the Bombardier Global Express?
It's the closest I can find on their web site. If so I can't see a
prominent nose boom in the pictures there. Car to enlighten me?

Phil
--
Great Tarverisms #7

Pitot: French word meaning tube.

John

alt.disasters.aviation
25 February 2002