At 06:20 PM 29/03/06, you wrote:
I can't comment on the display when thermalling. In practice, I totally
ignore Flarm in a gaggle - I'm too busy looking out the window, and I tend
to turn the volume down so as to not be distracted by the rare alarm -
However, the algorithm is so good that it doesn't trigger an alarm unless
someone re-centres aggressively, even with quite a few gliders present.
It has proven useful when I start to thermal alone, and within a few seconds
I get several contacts at 1-3k, at this point, they do seem to be coming
from the direction the unit predicts.
What the guy who posted on the FLARM forum was talking about (and
nobody seems to have answered him) is that when one or both of the
gliders in a potential collision pair are accelerating - circling is
continuous acceleration towards the center of the circle - the
relative bearing of the glider that is going to hit you keeps
changing until the collision. This can happen quite quickly where in
gliders you can go from the other glider being no threat in the one
thirty position, extending, to collision from the ten thirty
position in less than 15 seconds. If the FLARM sounds the alarm as
soon as the projected collison situation occurs the forum poster
says FLARM will tell you the threat is in the ten thirty position
right away. However that threat glider isn't actually there yet. It
is still moving from the one thirty position around to that position,
maybe under the nose of your glider. He seemes to want the threat to
be tracked so he can identify it sooner. This would seem to be possible.
This isn't necessarily a problem but users should understand how the
alarm system works lest they think they have a false alarm as there
doesn't appear to be a threat from the indicated position at the
moment the alarm sounds.
From your experience it seems that the *contacts* vs *threats*
algorithms and indications may work slightly differently.
Your first statement appears to be a little contradictory. If the
algorithm is so good why do you totally ignore FLARM in a gaggle and
turn the volume down?
Mike
Borgelt Instruments - manufacturers of quality soaring instruments
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
Int'l + 61 429 355784
email: [EMAIL PROTECTED]
website: www.borgeltinstruments.com
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