On Sunday, December 17, 2017 at 2:40:15 PM UTC-5, Kiwi User wrote:
On Sun, 17 Dec 2017 09:23:17 -0800, JS wrote:

Linking a couple of recent threads: Connecting multiple varios and how
to change ASI markings....

I discovered the reason for a flight computer's inconsistent readings
was the bezel on the ASI not being tight enough to seal. Snugging it up
resulted in a more accurate ASI and flight computer.
Checking each instrument is a good winter project. Techniques are
described in the back of Reichmann's "Cross-Country Soaring".
Jim

There is a good description of how to prevent interference between varios
sharing the same TE probe he http://www.borgeltinstruments.com/
and select "Articles" from the menu bar and then "Installation" from the
menu on the left.

In summary, there is no chance of interference if all devices sharing the
probe are modern pressure sensing instruments, otherwise locate the
splitter as near the TE probe as possible and never just behind the panel.

================

Semi-related supplementary question: some of the older electronic varios,
e.g the Cambridge Mk 4 used capacity bottles, so were obviously, like
mechanical varios, flow-sensing instruments. What I'd like to know is how
did they measure the flow? Did they use a hot wire sensor or something
more exotic?


--
Martin | martin at
Gregorie | gregorie
| dot org

Cambridge varios used 2 thermistors in line to sense flow.
UH