I've just added a static port system and a new altimeter model to
CVS.  Now, if you set the property

  /systems/static/serviceable

to false, the altimeter will freeze.  Otherwise, it displays the
altitude based on the difference between outside air pressure (with a
slight lag from the static port) and the altimeter setting, without
any direct knowledge of the actual aircraft altitude.

When I have a chance, I'll write a new VSI model, also connected to
the static port.  I'll also add a pitot system, then will write an ASI
connected both to it and the static system.  I need to know more about
the ram-air effects in the pitot tube first.

The static system itself needs a little more work, including support
for multiple static ports, sideslip errors, and alternate air (from
inside the cabin); those won't be hard to add, but if anyone (Alex?)
wants to take a look at src/System/static.[ch]xx and add them in
before I have a chance, feel free.  Note that any improvements to the
static system automatically propagate themselves to the instruments.


All the best,


David

-- 
David Megginson, [EMAIL PROTECTED], http://www.megginson.com/

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