AA Butterfly versus CNv LCD wind calculation

On Monday, September 19, 2016 at 10:57:42 AM UTC-4, Dan Marotta wrote:
I think without that, the wind calculation is really a best
guess based on the assumption that you're flying a circle.

That is incorrect for any decent wind calculation algorithm;
certainly precise circles are not required. With SN10 you will
often have estimated wind before you are off of tow...

TAS and GPS are sufficient to determine
headwind / tailwind component flying in a
straight line.

To get crosswind component, you need a
compass to supply heading, then apply
that to the GPS track.

Whichever one you like better "must" be the most accurate.

On 9/18/2016 9:39 PM, wrote:
On Friday, September 16, 2016 at 4:23:48 PM UTC-4, wrote:
If anyone has experience using both varios at the same time, please share your opinions.
When you have 2 or more systems how can you possibly know which wind reading is more accurate?
Without flying in a giant laboratory with controlled winds how do you know what the truth is to compare each system to?
I would imagine each system needs to average the data over some time period, so unless you can set them to be the same how can you tell?
If you make note of the in flight wind indications then reviewed that part of the flight in SeeYou would that be useful?

Chris

--
Dan, 5J

Reminds me of my Father, 'it isn't what it is, it is what I call it, that matters". Found out this meant a pipe can be a hammer

So the "best Vario" is the one you think is the best.


On Monday, September 19, 2016 at 7:50:48 AM UTC-7, Dan Marotta wrote:
Whichever one you like better "must" be the most accurate.

On Friday, September 16, 2016 at 4:23:48 PM UTC-4, wrote:
The Air Avionics Butterfly has developed an outstanding reputation as having a competitive advantage for its ability to "instantaneously" calculate wind direction.

Does the CNv (with latest 3.3.3899 or beta 3.4.4089) calculate wind as quickly as the Butterfly?

T8, what is the wind direction update rate of the CNv?

If anyone has experience using both varios at the same time, please share your opinions.

Thread hijacking: Does anyone have experience with the CNv in wave? What settings do you use? What screen?

On 9/23/2016 1:56 PM, Dan Daly wrote:
Thread hijacking: Does anyone have experience with the CNv in wave? What settings do you use? What screen?

I have used my CNvXC in wave and I set it exactly as I do for thermal
soaring. It's my Streak/XCSoar that gets set up differently. On the
Streak, I zoom in way in, maybe 2 mile or less range and then I can see
the line of best lift and navigate quickly to it following an upwind
reversal turn. As altitude increases the leg length also (generally)
increases.

Wave will be upon us soon!

--
Dan, 5J

On Friday, September 23, 2016 at 6:42:17 PM UTC-4, Dan Marotta wrote:
On 9/23/2016 1:56 PM, Dan Daly wrote:
Thread hijacking: Does anyone have experience with the CNv in wave? What settings do you use? What screen?

I have used my CNvXC in wave and I set it exactly as I do for thermal
soaring. It's my Streak/XCSoar that gets set up differently. On the
Streak, I zoom in way in, maybe 2 mile or less range and then I can see
the line of best lift and navigate quickly to it following an upwind
reversal turn. As altitude increases the leg length also (generally)
increases.

Wave will be upon us soon!

--
Dan, 5J

Thanks! I do that with XCSoar on my Oudie Lite. On the CNv, I assume you don't use Thermal Assistant, just the snail trail?

The club Pawnee goes to Lake Placid today.

Dan, 2D

I've got the mechanical CNv so no snail trail or thermal assistant. Had
the LCD version been available at the time, I likely would have gotten one.

On 9/24/2016 5:41 AM, Dan Daly wrote:
On Friday, September 23, 2016 at 6:42:17 PM UTC-4, Dan Marotta wrote:
On 9/23/2016 1:56 PM, Dan Daly wrote:
Thread hijacking: Does anyone have experience with the CNv in wave? What settings do you use? What screen?
I have used my CNvXC in wave and I set it exactly as I do for thermal
soaring. It's my Streak/XCSoar that gets set up differently. On the
Streak, I zoom in way in, maybe 2 mile or less range and then I can see
the line of best lift and navigate quickly to it following an upwind
reversal turn. As altitude increases the leg length also (generally)
increases.

Wave will be upon us soon!

--
Dan, 5J
Thanks! I do that with XCSoar on my Oudie Lite. On the CNv, I assume you don't use Thermal Assistant, just the snail trail?

The club Pawnee goes to Lake Placid today.

Dan, 2D

--
Dan, 5J

The mechanical vario and compass may have disappeared from your consciousness, but I bet they are still on the required equipment list from your glider's manufacturer. Something to remember at your next annual inspection. Just sayin'

In the ASG-29 a vario is minimum equipment for France, but does not specify electric or mechanical. USA required ASI, ALT, Compass 9which I am not sure why i need as I have two gyro compasses.


On Monday, September 26, 2016 at 6:17:06 PM UTC-7, wrote:
The mechanical vario and compass may have disappeared from your consciousness, but I bet they are still on the required equipment list from your glider's manufacturer. Something to remember at your next annual inspection. Just sayin'