On 5/5/2021 1:38 PM, krasw wrote:
On Wednesday, 5 May 2021 at 01:35:20 UTC+3, Aldo Cernezzi wrote:

When flying in the mountains, instant wind vector display is an absolute advantage. In the flatland, an averaged calculation may be satisfactory. I used to be a big Zander fan (magnetic compass interface, almost completely free from the unsolvable problems created by flux-gate compasses). Now I'm happy to see a new generation of promising devices.


Aldo Cernezzi
www.voloavela.it

The vector math of calculating instant wind from TAS/GS difference with corresponding flight track is pretty simple. What I don't understand is how to do this unless you have consecutive wind vectors from different directions. Thus Hawk cannot update wind reading unless glider is in circling flight. Yes there is no problems with compass, but there is no way of determining wind by flying to one direction.

Have you read their paper? They are certain they can determine wind without
circling or a compass. I don't pretend to understand the paper, but this portion
from the paper describes how it might be possible:

"The mathematical system theory also answers the question under what conditions
a wind estimation is possible. In the case of a borderline case of an exact
straight flight movement and completely calm air, this is not possible. All
triangles are identical. We (Huang and Meyr) could show, however, that the
random changes in the air movement are sufficient to make the system
"observable.” "

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