On 4/30/2021 12:43 AM, John Galloway wrote:
On Friday, 30 April 2021 at 05:14:26 UTC+1, Eric Greenwell wrote:
On 4/29/2021 3:15 PM, jfitch wrote:
It does not sound like an inertial solution, but rather a more sophisticated pneumatic and magnetic calculation. It will be interesting to compare it to a Butterfly. In their paper, they erroneously claim that no instant wind calculation method existed before theirs - marketing I guess.
On Tuesday, April 27, 2021 at 10:27:19 AM UTC-7, wrote:
Has anyone any experience yet with the new Lxnav Hawk Wind program? Sounds superficially to me like it might be an alternative to the Butterfly wind solution which is no longer readily available. And this program seems to avoid some of the Butterfly installation challenges?
I don't think it uses magnetic sensing, as it does not require the optional
compass. So, it's all inertial and GPS, and I think doing it without a compass
was an important goal. 990eur for wind equal to the Butterfly, and a AHRS, is at
reasonable price for me. A separate AHRS is in the $800-$1000 range, so I'd bet
getting the Hawk features for about $200-$400 dollars with the Hawk/AHRS.
--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

The HAWK article referenced on the LXNAV website makes it very clear that it doesn't use magnetic sensing and why:

https://gliding.lxnav.com/news/segel...magazines-eng/

Except for people with a Butterfly vario already installed that vario is now history so for the rest of us there isn't much value in comparing the two systems.

There is for me: I have a new glider ordered, and I considered keeping the
Butterfly vario that's in my current glider. Now, I'm willing to let it go with
the current glider when I sell it.

It should also be a useful comparison for people that want a vario with a fast
wind update, and now know there is something that may be as good (or maybe even
better) than the now unavailable Butterfly.

--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1