On Thursday, July 26, 2012 8:32:41 AM UTC-7, John Galloway wrote:
At 13:34 26 July 2012, JohnDeRosa wrote:
>On Jul 26, 3:33=A0am, John Galloway wrote:
>> Flarm themselves have made the same point since the
>> beginning. =A0See their PP presentation from 2005:
>>
>> http://www.flarm.com/files/basic_presentation_en.ppt
>>
>> At 22:22 25 July 2012, John Trezise wrote:
>>
>> >On Jul 25, 11:14=3DA0am, Darryl Ramm =A0wrote:
>> >> And if I was religious I'd thank God G made it out
OK.
>>
>> >> Darryl
>>
>> >Having with at a "flarm mandatory" club for over 4
years,
>> my view is
>> >that flarm is of little use where there are a significant
>> number of
>> >gliders in a gaggle (ie contest/regatta situation) as
the
>> alarms are
>> >set of very frequently, but there is not the time to
>> identify whether
>> >the cause is the glider you can see or someone else.
>>
>> >John
>
>Slide numbers that seem to relate to gaggling; 12, 17
>
>I might be wrong but I don't see that the FLARM PPT
mentions anything
>if their device is good, bad or indifferent during gaggling.
>
>Did I miss something?
>
>- John
>

The diagrams in Slide 12, "Situation in Gliding", indicate
the scenarios in which Flarm was predicted to give
improvement on See and Avoid and the one that it can't -
i.e. "identical circling".

John G.

As I think "Flarm" (Urs?) is already trying to say in this thread. This may well change with use of the second flarm antenna in PowerFLARM -- if it is mounted to the rear/underside of the glider. We'll need to see how many owners do that with PowerFLARM and how it works out in practice.

My personal worst scare in a thermal was a clueless pilot entering the thermal in the opposite direction, coming straight at me while I was busy with a few other gliders above and below me, something I expect flarm would have totally alerted me to before I saw him. OTOH there are probably lots of times I was aware of other gliders thermalling close by in the same direction and never saw them.

We all need to remember that saying: perfection is the enemy of good. We don't need to be seeking perfection, but no argument that understanding practical limitations is important.

Darryl