[simpits-tech] Zero point on a two needle altimeter

[Matt Bailey]

It'd usually about at the 3 o'clock position, there is a knob on the
lower left of the altimeter that adjusts it. You set this window to read
the current atmospheric pressure (at sea level, I believe) which is
found by listening to ATIS, or checking weather, etc. This is so when
you are at 3,000ft your altimeter always reads 3,000ft regardless of
pressure variations (theoretically, anyway). I was saying that if you
used a pressure valve to adjust the pressure in the bellows to the
actual air pressure at the simulated plane's altitude, you would be able
to use the Coelsman window as it is used in real life, since you are
basically giving the altimeter the same input it gets in real life.

	-Matt Bailey

Craig Rochester wrote:
> 
> What is a Colesman window?
> 
> -----Original Message-----
> From:   simpits-tech-admin@simpits.org [mailto:simpits-tech-admin@simpits.org]
> On Behalf Of Matt Bailey
> Sent:   Saturday, October 26, 2002 8:44 PM
> To:     simpits-tech@simpits.org
> Subject:        Re: [simpits-tech] Zero point on a two needle altimeter
> 
> I thought about a pressure box, but that seens like it would be tricky
> to meter out exactly the right pressure to get a precise, accurate
> reading. It would be cool if you could make it work though, you could
> just output the atmospheric pressue in the sim...this would even allow
> the Colesman window to work.
> 
>         -Matt Bailey