Wanted: Cambridge Mark IV Vario and Flight Director with Audio

[miln...@yahoo.com]

Looking for an old, working, Mark IV with internal TE compensation for a motor glider that does not have a TE probe line installed. Dave Milner at milnerdv at yahoo.com

[Ben Coleman]

There's a MkIV here:
http://glidersales.com.au/instruments.php

I don't know about the compensation though (just saw it when browsing there).

Cheers Ben

[Greg Delp]

On Thursday, May 19, 2016 at 5:52:52 PM UTC-4, miln...@yahoo.com wrote:
> Looking for an old, working, Mark IV with internal TE compensation for a motor glider that does not have a TE probe line installed. Dave Milner at milnerdv at yahoo.com

I've got both that I pulled out of a Grob 104 when I installed a newer Digital smart vario. If you're interested send me a message and I can send pics.

[miln...@yahoo.com]

I contacted the seller and it was sold a long time ago. It seems like no modern vario's have internal TE compensation because every new glider in the past 20 years or more is built with the plumbing for a TE probe at the factory. Some higher end vario's from the 70's had electronic TE compensation built into them. My guess is because they were being retrofitted into gliders that did not have the plumbing already. The other option is to find a Schuemann "Magic Box" pneumatic compensator.

I have a Westerboer VW910 and VW921 currently but it doesn't really work for the Vivat as you have to select from a few pre-programmed glide polars and they are all much higher performance than the Vivat.

Dave

[Ben Coleman]

I think most of the new electronic varios have non-TE compensation options. Definately LX and Clearnav. Or are you after a backup?

Cheers Ben

[Tim Taylor]

302 also has a non-TE configuration. It works nearly as well as the TE option.