PowerFLARM leeching comments

On Wednesday, October 24, 2012 12:26:44 PM UTC+2, Chris Nicholas wrote:
Just in case this too is not obvious, bear in mind that if you are in high speed wave or ridge, and fly into wind slower than the wind speed, you will go backwards. So Flarm’s “12 o’clock” is behind you, in your visual 6 o’clock. Bearings/azimuth to other contacts will be related to that..

That is true. The effect is also an issue with crosswind. Flarm may show you a 10 o clock alert for an 11 o clock target.
- Folken

Where have you seen a 10 o clock alert in flarm?
Which display have you seen, from Flarm, showing a 10 o clock field?


"folken" wrote in message
...

On Wednesday, October 24, 2012 12:26:44 PM UTC+2, Chris Nicholas wrote:
Just in case this too is not obvious, bear in mind that if you are in high
speed wave or ridge, and fly into wind slower than the wind speed, you
will go backwards. So Flarm’s “12 o’clock” is behind you, in your visual 6
o’clock. Bearings/azimuth to other contacts will be related to that.

That is true. The effect is also an issue with crosswind. Flarm may show you
a 10 o clock alert for an 11 o clock target.
- Folken

On Fri, 26 Oct 2012 18:53:56 +0200, pcool wrote:

Where have you seen a 10 o clock alert in flarm?
Which display have you seen, from Flarm, showing a 10 o clock field?

I think Folken is referring to what the original small 'ring of LEDs'
FLARM display shows you. Its angular resolution is pretty coarse and the
vertical resolution ('above you' or 'below you) is even coarser. As a
result, I tend to scan a fairly wide sky segment (maybe 45 degrees wide
and high) to pick up the bandit. This is probably a wide enough scan to
allow for the difference between heading and track under most thermal
conditions.

I haven't (yet) used FLARM for ridge or wave soaring, which is when the
difference between heading and track could be much larger.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
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