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Traffic warning, aircraft following, towing gliders


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Blaufranky
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Posts: 5, Visits: 4
Dear all,
I am using SkyDemon with SkyEcho II, FLARM-license and iPhone as a traffic screen and I could not be happier with this setup. Works like a charm. Thank you very much.

There is only one issue that I like to report for consideration:
I am flying the tow-aircraft in a glider club and with SkyEcho II + FLARM I get a much better overview on where all these gliders are.
But the glider behind the tow aircraft is generating multiple traffic warnings like "glider behind, following, same level".
I do not want to silence these warnings, because the glider will soon be released and becomes a potential thread.

Is there a work around for this issue, that I have not found so far.

Or can it be considered not to warn, if a target is following constantly on "almost same distance and same level" or from ground onwards.

Or more in general: an aircraft behind the own aircraft should not be a potential thread unless it gets into the half-sphere from approximately 90° ... 150° right to left or has much higher speed so that it obviously caches up.

Thank you again and very best regards
Frank

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Hamish Mead
Hamish Mead
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Group: Forum Members
Posts: 19, Visits: 97
Tim,
I appreciate the 'selectively ignore it if we think you're towing it' approach would be dangerous.

Instead, might it be possible to implement a 'selectively silenced until beyond range' approach?

Here's how it might operate:
SD continues to silently monitor a glider under tow for which alerts have been selectively silenced by the tug pilot,
Reversion to normal alerting is automatically triggered when the glider releases, by the combined logic:
- Cessation of the (silenced) alerts AND
- The glider exceeding some distance from the tug beyond the length of the tow rope – such an additional test may be necessary for the logic of the first test alone to not result in a false negative; say when a glider is still under tow and performs boxing manoeuvres. (Apologies if I'm talking bollocks - my understanding of FLARM's full capabilities is limited.)

If it could be made to work, it would mitigate the two safety concerns @Blaufranky raised:
- The need to go 'heads-down' in order to manually un-ignore alerts following glider release, and
- The distracting nature of the nuisance alerts of an otherwise known threat.

As an ex-tuggy I can fully see Blaufranky's concerns.

GO

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Threaded View
Blaufranky - 4/15/2021 6:42:11 PM
efrenken - 4/15/2021 9:15:02 PM
Blaufranky - 4/16/2021 6:25:38 AM
Tim Dawson - 4/16/2021 9:08:02 AM
Blaufranky - 4/16/2021 12:42:24 PM
Raphael_A - 4/17/2021 3:09:01 PM
Sky Painter - 4/18/2021 9:58:58 AM
hairy_kiwi - 5/9/2021 12:41:08 AM
Tim Dawson - 5/10/2021 9:47:48 AM
hairy_kiwi - 5/10/2021 11:25:14 AM
Blaufranky - 5/10/2021 11:31:03 AM
Blaufranky - 5/30/2021 7:57:57 PM
Tim Dawson - 6/1/2021 9:05:50 AM

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