Cambridge 302 problem..HELP Please

On Jun 25, 8:50*am, T8 wrote:
On Jun 24, 10:45*pm, David Prather

wrote:
I have the same problem-- tremendous "lift" starting at 80 kts. I am
trying to share the TE connection with a mechanical Winter vario that
works with a capacity flask. Does anyone else share TE between a
mechanical vario and the 302?

-David Prather

David -

302 works best with dedicated TE and static ports. *Excess volumes in
the systems (capacity vario, asi, altimiter) play hell with pressure
transducer instruments like 302. *TE can be shared, with some loss of
performance. *As previously noted, the closer the "tee" is to the
probe, the better. *I would suggest test flying with dedicated ports,
then work from there to a compromise that works for you. *Pitot may be
shared with asi.

As far as anomalous "lift" indications in cruise, obvious things to
check were covered -- correct connections, no leaks (including probe
socket o-rings), correct polar in 302, correct ias showing on 302.

Electronic compensation is fraught with difficulties (chiefly that is
extremely sensitive to *small* pneumatic errors in both magnitude and
timing) and never recommended as a preferred approach.

-Evan Ludeman / T8

Edit: "TE can be shared with a capacity type vario, with some loss of
performance". But don't put the tee close to the instruments if you
do this!

All ports may be shared with other pressure transducer type
instruments, without loss of performance. Tee location not critical
in this case.

-T8