"Lars P. Hansen" wrote:

OK, here we go: Could devices like this not also be used to detect
thermals?

Robert Ehrlich wrote:
disbelief that the sensors could work as described

I wrote an explanation of how they can work snipped

"F.L. Whiteley" wrote in message
...

Still illegal under the rules IIRC, unless there's been a quiet change.

Frank Whiteley


When I first looked at this, I would have agreed with you. But as
described, it gives just gives airspeed along all three axes.
Now, if you added a forward looking pair of beams with a longer focal length
to see any differences between the extremely local airmass and the slightly
further away airmass, _that's_ probably against contest rules.

Tim Ward