WTB E-Vario

On Tuesday, September 29, 2015 at 9:30:30 AM UTC-4, wrote:
I suspect you're right, T8. Would that also apply to the LNAV itself? That might make me finally address the issue of sharing a triple probe TE with my Winter backup vario, which has been the case since the glider was new in 1992. The biggest sin, I imagine, is using a "T" connection immediately behind the instrument panel rather than a "Y" farther back in the fuselage. Question: would you expect both varios to benefit from this, or just my LNAV?

Chip Bearden
ASW 24 "JB"
U.S.A.

I haven't played with an LNav in a long time. I think that's a flask/flow type instrument and those always seemed more tolerant of sharing TE with a mechanical.

We really started seeing problems when guys tee'd their new 302s in line with Winter & Sage varios. Didn't affect the mechanical, but the 302 acted lobotomized.

Whether splitting the TE line helps probably depends on the impedance of your probe. I've got one of those oldie but goodie venturi type triple probes and the venturi is mounted at the end of a rather small capillary. The impedance is high and I gave up trying to get a mechanical to play nice with a 302... solution was replace Winter with B400 for backup (pressure transducer instruments can share pneumatic sources, no issues here).

The other thing that can work is running your fancy primary vario off pitot + static with "electronic" compensation and leave the probe for your mechanical. In this case, the pitot and static need to be *really* good (fin mount triple probe) and not shared with mechanical instruments.

best,

Evan Ludeman

The other thing that can work is running your fancy primary vario off pitot + static with "electronic" compensation and leave the probe for your mechanical. In this case, the pitot and static need to be *really* good (fin mount triple probe) and not shared with mechanical instruments.

Yes, the LNAV is a flask/flow vario. I do notice what could be some minor transient cross talk between it and the Winter but I'm used to it.

In my previous glider, I had two identical older Cambridge varios (IIRC, something called a Mark II, but pre MNAV) on completely separate pneumatic (and battery) systems: one on a Schuemann TE compensator connected to pitot and fuselage statics and the other on a venturi with a homemade netto capillary connected to forward fuselage statics. After flying around with loops of instrument tubing in my lap one day changing the length of tubing on the Schuemann and the number of hypodermic needle restrictors on the homemade netto, they both read nearly identically during pull ups and pushovers. I had a Cambridge audio for which Raouf Ismail graciously made up a special switch that I could toggle from one vario to the other if I needed. I loved that system!

I confess that I did look at other varios in the past with the objective of getting electronic TE that would provide that 100% independence I had in my previous panel. I have lost primary varios several times over the years and it's an unsettling feeling.

Chip Bearden
ASW 24 "JB"
U.S.A.

On Tuesday, July 28, 2015 at 7:04:38 PM UTC-7, wrote:
E-Vario required/wanted.

What you got?

Really thought you'd accept JJs offer, or pick up Tom's 302.

Perhaps it's possible to take the pro out of procrastination...
A Borgelt B40 was just listed on Wings And Wheels.

Yes it's expensive, but comes with a free ASW27. Talk to Fidel.
Jim

I was told yesterday that the '27 in Fidel's care has been sold.

On 9/29/2015 8:09 PM, JS wrote:
On Tuesday, July 28, 2015 at 7:04:38 PM UTC-7, wrote:
E-Vario required/wanted.

What you got?
Really thought you'd accept JJs offer, or pick up Tom's 302.

Perhaps it's possible to take the pro out of procrastination...
A Borgelt B40 was just listed on Wings And Wheels.

Yes it's expensive, but comes with a free ASW27. Talk to Fidel.
Jim

--
Dan, 5J

On Tuesday, September 29, 2015 at 9:30:16 AM UTC-5, Tango Eight wrote:

The other thing that can work is running your fancy primary vario off pitot + static with "electronic" compensation and leave the probe for your mechanical. In this case, the pitot and static need to be *really* good (fin mount triple probe) and not shared with mechanical instruments.

That is my approach - my SN10 gets fed by a nice Ilec TE probe, and my other vario is the really nice electronic TE Westerboer 1020, which works just fine using the aircraft pitot and vario statics.

No concerns with TE probe leaks, cross talk, etc...

Mechanical varios are so last century....

Kirk
66

It's been a while since I did the research. What are the logical choices for a reliable vario (to use as a backup) with electronic TE? Include used.

Chip Bearden
ASW 24 "JB"
U.S.A.

On Wednesday, September 30, 2015 at 9:29:01 AM UTC-6, Dan Marotta wrote:
I was told yesterday that the '27 in Fidel's care has been sold.




On 9/29/2015 8:09 PM, JS wrote:



On Tuesday, July 28, 2015 at 7:04:38 PM UTC-7, wrote:


E-Vario required/wanted.

What you got?


Really thought you'd accept JJs offer, or pick up Tom's 302.

Perhaps it's possible to take the pro out of procrastination...
A Borgelt B40 was just listed on Wings And Wheels.

Yes it's expensive, but comes with a free ASW27. Talk to Fidel.
Jim





--

Dan, 5J

Just one correction...The 27 discussed, in Fidel's care at Moriarty, has NOT been sold. I just confirmed this with him 2 minutes ago. It is still available!
Thanks - Renny

On Wednesday, September 30, 2015 at 3:42:25 PM UTC-4, wrote:
It's been a while since I did the research. What are the logical choices for a reliable vario (to use as a backup) with electronic TE? Include used.

Chip Bearden
ASW 24 "JB"
U.S.A.

Used Cambridge 302 with GPS date bug. Good, electronic TE capable, cheap.

best,
Evan

On Wednesday, September 30, 2015 at 2:42:25 PM UTC-5, wrote:
It's been a while since I did the research. What are the logical choices for a reliable vario (to use as a backup) with electronic TE? Include used.

Chip, the Westerboer VW1020 can be setup to use either a TE probe or electronic compensation, via Pitot and Static. I've used several Westerboers and really like them.

http://wingsandwheels.com/westerboer-vw1020.html

Kirk
66

On Wednesday, July 29, 2015 at 8:37:55 AM UTC-8, Craig Funston wrote:
On Wednesday, July 29, 2015 at 7:34:00 AM UTC-7, wrote:
Hey Giles. I'm just looking for the vario 57mm or 80mm

Thank you for,your reply.

Steve

I have an old 80mm Cambridge electric vario. No audio. Is that the end of the spectrum you're looking for? $30 and it's yours.

Craig
7Q

Hi Craig 7Q, Please let me know if you still have an "old 80mm Cambridge electric vario" for sale? Andre