AA Butterfly versus CNv LCD wind calculation

On Sunday, September 25, 2016 at 11:15:12 PM UTC-7, krasw wrote:
On Monday, 26 September 2016 04:25:15 UTC+3, Sean wrote:
LXNav S10 backup this spring for my new panel. I do not think the butterfly is worth the price...

SMF
7T

What are you backing up with S10? Don't you have mechanical vario?

No need for a mechanical backup the S10 has an internal backup battery for 3 hrs of use.

Richard
www.craggyaero.com

On Monday, 26 September 2016 17:24:02 UTC+3, Richard wrote:
On Sunday, September 25, 2016 at 11:15:12 PM UTC-7, krasw wrote:
On Monday, 26 September 2016 04:25:15 UTC+3, Sean wrote:
LXNav S10 backup this spring for my new panel. I do not think the butterfly is worth the price...

SMF
7T

What are you backing up with S10? Don't you have mechanical vario?

No need for a mechanical backup the S10 has an internal backup battery for 3 hrs of use.

Richard
www.craggyaero.com

Never heard of anyone not having a mechanical vario in glider.

On Sunday, September 25, 2016 at 6:25:15 PM UTC-7, Sean wrote:
I agree with you that the Butterfly is the best "all in one" on wind from the marketing on the product and the reports from the pilots. I was ageeing that my question was "indirectly" answered in terms of concensus that a fixed compass integrated with a vario is going to be faster, better, more accurate in a straight line...

I hope that clears me.

I'm just not sold yet on the importance of the hyper accurate wind data. Im way to busy looking out the window and usually only listen to the speed to fly. Maybe a special been for significant wind change would be useful to hint to the pilot that therre is something of value to check? Cross referencing for wind changes in a thermal, street, sheer line or wave or something like that is interesting, but I certainly am not doing it often at current.

I like to try and feel with my rear as much as possible while cross referencing with my ears and the vario. I also generally have not flown with the Butterly. I only played with one for 1 week at a contest. Not enough time to master it and ultimately chose a ClearNav Vario and a LXNav S10 backup this spring for my new panel. I do not think the butterfly is worth the price...

SMF
7T

Once you have (and use) the instantaneous wind information, you begin to understand how useful it is. The Butterfly seems to be about the same price as the LX product, similarly configured. S100 + compass module + AHRS to get to the Butterfly spec., and still no inertial wind or VAM.

On Monday, September 26, 2016 at 8:35:58 AM UTC-7, krasw wrote:
On Monday, 26 September 2016 17:24:02 UTC+3, Richard wrote:
On Sunday, September 25, 2016 at 11:15:12 PM UTC-7, krasw wrote:
On Monday, 26 September 2016 04:25:15 UTC+3, Sean wrote:
LXNav S10 backup this spring for my new panel. I do not think the butterfly is worth the price...

SMF
7T

What are you backing up with S10? Don't you have mechanical vario?

No need for a mechanical backup the S10 has an internal backup battery for 3 hrs of use.

Richard
www.craggyaero.com

Never heard of anyone not having a mechanical vario in glider.

I don't.

On Monday, September 26, 2016 at 8:35:58 AM UTC-7, krasw wrote:
On Monday, 26 September 2016 17:24:02 UTC+3, Richard wrote:
On Sunday, September 25, 2016 at 11:15:12 PM UTC-7, krasw wrote:
On Monday, 26 September 2016 04:25:15 UTC+3, Sean wrote:
LXNav S10 backup this spring for my new panel. I do not think the butterfly is worth the price...

SMF
7T

What are you backing up with S10? Don't you have mechanical vario?

No need for a mechanical backup the S10 has an internal backup battery for 3 hrs of use.

Richard
www.craggyaero.com

Never heard of anyone not having a mechanical vario in glider.

The two varios mentioned in the OP are all I have. The mechanical vario went away a long time ago, as did the mechanical compass.
Jim

I have a CNv-XC-digital as primary, LX S3 secondary. If they fail, I have the seat of my pants...

On Monday, September 26, 2016 at 11:35:58 AM UTC-4, krasw wrote:

Never heard of anyone not having a mechanical vario in glider.

I haven't had a mechanical in years. I have a B400 for backup (with AA back up battery pack) but it hasn't been switched on for more than a functional check in about 4 years (the last time I got out to the airport and discovered my batteries hadn't come with me).

Mechanical varios don't play well with modern pressure transducer type varios and should not share TE sources with them.

Evan Ludeman / T8

On Monday, September 26, 2016 at 10:35:58 AM UTC-5, krasw wrote:

Never heard of anyone not having a mechanical vario in glider.

Really? I havn't had a mechanical vario in my glider (LS6) since 2001. Gave the Sage that came with it to a good friend (who likes mechanicals) and have used an SN10 and a Westerboer since then.

Carefully designed electrical system with two independent batteries. Never had a complete failure.

I have lost one vario due to a leak in my TE probe - nice that my backup has electronic TE, so I still had a fully functions system, with audio, netto, etc..

Now, tell me again why I would want a mechanical vario?

Kirk
66

Mechanical varios don't play well with modern pressure transducer type varios and should not share TE sources with them.

Evan Ludeman / T8

A practice many seem to ignore. Do you think there is any advantage to using a fin mounted Prandtl tube versus fuselage pitot/static ports? Do you prefer mechanical or electronic TE? How do you "plumb" your CNvXC and B400?

On 9/26/2016 10:15 AM, Tango Eight wrote:
snip
Mechanical varios don't play well with modern pressure transducer type varios and should not share TE sources with them.

Evan Ludeman / T8

I have a 57 mm Winter mechanical and a CNvXC connected to the triple
probe in my Stemme. The needles on each track perfectly with each
other. The Winter is in my line of sight and I moved the CNvXC to the
right side of the panel for my wife to use. I still use the CN's audio
and occasionally glance at the averager and STF displays. BTW, the
speed ring on the Winter and the STF on the CN also track quite
closely. Some day, if/when I upgrade my panel, I'll probably replace
the Winter with one of the fine new electronic varios but, for now, what
I have works just great.

--
Dan, 5J