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From: "colyncase on earthlink" <colyncase@earthlink.net>
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Subject: Re: [LML] Re: Airplane Construction Philosophy
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=20
Mike writes,

I think Chelton is better than most of the other "glass" out there.

I have a lot of respect for Chelton.  =20
I think you are referring to my comment that because I work on computers =
I don't have a Chelton EFIS in my cockpit.
I should have said "I don't have ANY PFD" on my panel.

You are right that SW is a big problem but I was actually talking about =
the HW. When we design digital computers we draw nice little SQUARE =
looking waves and talk about clock EDGES and how it is all supposed to =
work.   Then you get one of these things on a test bench and hook up an =
oscilliscope and look at what is really happening and you see all sorts =
of wiggles and signal ringing and jitter and you're pretty amazed it =
works at all.  Now throw in environmental factors, power isuues, static, =
 radio noise, and it gets more interesting.   Chelton has done a lot of =
work on all that.

It mostly works but I would say anyone who flies behind one of these =
things and doesn't positively plan on using the mechanical backups some =
day, is asking for trouble.     I thought about what transitioning to =
the backups IMC would feel like after, say, 700 hours of the PFD and I =
didn't like it.  This is not the same as having a 6-pack and subtituting =
another gyro in your scan.  It's not just a matter of looking 3 degrees =
to the left or right to use the other instrument.   It's getting your =
mind to process the information completely differently, now integrating =
information from 6 different gauges again. I might feel differently if I =
had more IMC time in on the 6-pack.   One day I may change my mind but =
at my experience level, which I consider relatively low at 850 hours, =
I'm going to stick with a standard 6 pack + backup gyros for now.

If I ever do put one of these in, it will likely be dual ahrs, dual =
power supply, muiltiple screen, and I'll still have some old gyros =
around.

In the meantime, don't let the smoke out of your avionics.  I hear they =
don't work too well after that.

Colyn


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<DIV>&nbsp;
<DIV><EM>Mike writes,</EM></DIV>
<DIV><EM></EM>&nbsp;</DIV>
<DIV><EM>I think Chelton is better than most of the other "glass" out=20
there.</EM></DIV>
<DIV><EM></EM>&nbsp;</DIV>
<DIV>I have a lot of respect for Chelton.&nbsp;&nbsp; </DIV>
<DIV>I think you are referring to my comment that because I work on =
computers I=20
don't have a Chelton EFIS in my cockpit.</DIV>
<DIV>I should have said "I don't have ANY PFD" on my panel.</DIV>
<DIV>&nbsp;</DIV>
<DIV>You are right that SW is a big problem but I was actually talking =
about the=20
HW. When we design digital computers we draw nice little SQUARE looking =
waves=20
and talk about clock EDGES and how it is all supposed to =
work.&nbsp;&nbsp; Then=20
you get one of these things on a test bench and hook up an oscilliscope =
and look=20
at what is really happening and you see all sorts of wiggles and signal =
ringing=20
and jitter and you're pretty amazed it works at all.&nbsp; Now throw in=20
environmental factors, power isuues,&nbsp;static, &nbsp;radio noise, and =
it gets=20
more interesting.&nbsp;&nbsp; Chelton has done a lot of work on all =
that.</DIV>
<DIV>&nbsp;</DIV>
<DIV>It mostly works but I would say anyone who flies behind one of =
these things=20
and doesn't positively plan on using the mechanical backups some day, is =
asking=20
for trouble.&nbsp;&nbsp;&nbsp;&nbsp; I thought about what transitioning =
to the=20
backups IMC would feel like after, say, 700 hours of the PFD and I =
didn't like=20
it.&nbsp;&nbsp;This is not the same as having a 6-pack =
and&nbsp;subtituting=20
another gyro&nbsp;in your scan. &nbsp;It's not just a matter of looking =
3=20
degrees to the left or right to use the other instrument.&nbsp;&nbsp; =
It's=20
getting your mind to process the information completely differently, now =

integrating information from 6 different gauges again.&nbsp;I might feel =

differently if I had more IMC time in on the 6-pack. &nbsp; One day I =
may change=20
my mind but at my experience level, which I consider relatively low at =
850=20
hours, I'm going to stick with a standard 6 pack + backup gyros for =
now.</DIV>
<DIV>&nbsp;</DIV>
<DIV>If I ever do put one of these in, it will likely be dual ahrs, dual =
power=20
supply, muiltiple screen, and I'll still have some old gyros =
around.</DIV>
<DIV>&nbsp;</DIV>
<DIV>In the meantime, don't let the smoke out of your avionics.&nbsp; I =
hear=20
they don't work too well after that.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Colyn</DIV>
<DIV>&nbsp;</DIV></DIV>
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