Soaring Avionics Archaeological Finds

We have been cleaning out our club's hangar's store room and are
finding all sorts of old and odd items, no doubt left over from some
old and odd members.

I was curious about two of the items and wondering if anyone can shed
some light.

- A clear bag containing two smaller clear bags. First bag is marked
"Netto" and contains what appears to be a very small brass valve with
~1/16" aluminum tubing coming out of each end. It might not be a
valve and might not be tubing. Second bag was labeled 0.003 (!)
stainless steel wire (almost thought the bag was empty at first). How
are these used in a Netto system?

- Cambridge Model AU-22 - Cigarette sized black aluminum box with a
speaker, two knobs, circuit board and a cable coming out of it.
Complete with a repair tag labeled Cambridge Aero Instruments, Warren-
Sugarbush Airport. I have never heard of this model number and
Google doesn't turn up any hits. Is this an early audio vario? What
does the connector connect to?

Thanks, John DeRosa

I believe the AU22 is the audio control on the CVS-50:
http://www.airtalk.org/cambridge-var...l-vt74218.html
http://www.bas.uk.net/docs/AU22.pdf

JP

On Monday, November 5, 2012 4:18:34 PM UTC-5, JohnDeRosa wrote:
We have been cleaning out our club's hangar's store room and are

finding all sorts of old and odd items, no doubt left over from some

old and odd members.



I was curious about two of the items and wondering if anyone can shed

some light.



- A clear bag containing two smaller clear bags. First bag is marked

"Netto" and contains what appears to be a very small brass valve with

~1/16" aluminum tubing coming out of each end. It might not be a

valve and might not be tubing. Second bag was labeled 0.003 (!)

stainless steel wire (almost thought the bag was empty at first). How

are these used in a Netto system?



- Cambridge Model AU-22 - Cigarette sized black aluminum box with a

speaker, two knobs, circuit board and a cable coming out of it.

Complete with a repair tag labeled Cambridge Aero Instruments, Warren-

Sugarbush Airport. I have never heard of this model number and

Google doesn't turn up any hits. Is this an early audio vario? What

does the connector connect to?



Thanks, John DeRosa

On Nov 5, 3:58*pm, Jp Stewart wrote:
I believe the AU22 is the audio control on the CVS-50:http://www.airtalk.org/cambridge-var.../docs/AU22.pdf

JP

The CVS-50 was the hint I needed. Thanks to Tim Mara for keeping this
old information available online.

http://www.wingsandwheels.com/pdf/au20%202.pdf
http://www.wingsandwheels.com/pdf/cvs40%2050%2060.pdf

Still trying to figure what the 0.003" SS wire is for.

Still trying to figure what the 0.003" SS wire is for.

IIRC, the wire is inserted into the tubing to calibrate the netto
device. One end of the netto is "T"d into the line between the vario
and the capacity bottle and the other end is connected to pitot, or--
depending on how the netto leak is calibrate--to static. It was easier
to change the effective resistance of the netto by moving the wire in
and out slightly than by trimming off tubing until, oops, you trimmed
too much.

This was in the days when nearly every vario (except for the Ball
series) had a 1/2 liter flask. And when the really fancy final glide
computers were plastic wheels instead of cardboard. And when real men
navigated with paper maps! And....

Chip Bearden
ASW 24 "JB"
USA

This was in the days when nearly every vario (except for the Ball

series) had a 1/2 liter flask. And when the really fancy final glide

computers were plastic wheels instead of cardboard. And when real men

navigated with paper maps! And....

no one had time to look outside while trying to figure out where they were on the map and if they could make it?

On 11/5/2012 3:36 PM, Tony wrote:
This was in the days when nearly every vario (except for the Ball

series) had a 1/2 liter flask. And when the really fancy final
glide

computers were plastic wheels instead of cardboard. And when real
men

navigated with paper maps! And....

no one had time to look outside while trying to figure out where they
were on the map and if they could make it?



It could be very time consuming figuring out where you were on the map,
then measure distances to your waypoint/airport, decide on a wind
component to use, twirl the "prayer wheel" to the right setting, and
finally discover your arrival altitude.

Shoot, just unfolding and folding the map and switching from one
sectional to the other was a big challenge! Electronic flight computers
eliminated almost all this distraction.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)

On Monday, November 5, 2012 4:18:34 PM UTC-5, JohnDeRosa wrote:
We have been cleaning out our club's hangar's store room and are
finding all sorts of old and odd items, no doubt left over from some
old and odd members.

I was curious about two of the items and wondering if anyone can shed
some light.

- A clear bag containing two smaller clear bags. First bag is marked
"Netto" and contains what appears to be a very small brass valve with
~1/16" aluminum tubing coming out of each end. It might not be a
valve and might not be tubing. Second bag was labeled 0.003 (!)
stainless steel wire (almost thought the bag was empty at first). How
are these used in a Netto system?

That's not wire, it is tubing, used to create a calibrated leak
for a netto. Perhaps valve turns netto leak on/off.


- Cambridge Model AU-22 - Cigarette sized black aluminum box with a
speaker, two knobs, circuit board and a cable coming out of it.
Complete with a repair tag labeled Cambridge Aero Instruments, Warren-
Sugarbush Airport. I have never heard of this model number and
Google doesn't turn up any hits. Is this an early audio vario? What
does the connector connect to?

Its an audio, hooks up to early Cambridge Variometer products.
Uses a unijunction oscillator !


You should see the stuff in my basement !
See ya, Dave "YO electric"

John, et al:
If you install the AU-22 in a glider with a metal instrument panel and have a problem with radio transmissions interfering with the vario, Dave Ellis had a mod:
Cut the -12V trace in the audio box that goes to the chassis.
Believe "That instrument was before my time at Cambridge" was in his explanation.
Also believe mine was an AU-20, the 22 may be sans built in ground loop.
Jim