At 08:39 PM 29/04/2012, you wrote:
That said a better system would appear to be a compromise with similar
systems being used across GA, RAAus and Gliding, good luck with that!
It is called ADSB. A suitable Mode S (also works for Mode A/C)
transponder and a GPS make the ADSB OUT part.
A suitable receiver gives you ADSB IN and you can see all the other
ADSB OUT traffic.
It is a "short range system" - it only goes to the local horizon :-)
Much of the heavy metal flying around nowadays is ADSB OUT equipped
and gradually the regional airliners flying doc etc.
A reasonable compromise right now is to install a Mode S transponder
and a Zaon MRX. TCAS equipped aircraft can see you and you'll
get warning there's someone else around if they have a Mode A/C or S
transponder and you're in radar coverage.
Flarm as it exists right now is a nice "proof of concept" device. It
badly needs more rf power which means a licensed dedicated frequency.
This is difficult to organise.
If it was mandated in all aircraft it would likely come with a
requirement to be installed by a qualified installer and be checked
at least every 2 years etc etc. It certainly wouldn't be a Euro 750
device for you.
Adrian and I looked at a Flarm like device in 2000 and got as far as
deciding how often to transmit and what information would be
transmitted. Adrian's son who is also in the instrument field but
with much more rf expertise suggested we go to 2.4 GHz for a proof
of concept device and we figured about 6 devices would do this but
with a maximum range of 5Km we thought a proof of concept was all it
would be and it wasn't going to prove much anyway as we knew it
would work. Getting a better frequency with more power seemed too
difficult as did getting enough aircraft fitted to make a difference.
I'll repeat what I said a few days ago. There was another Flarm on
Flarm midair with both Flarms apparently working recently. Flarm
doesn't prevent mid airs - at best it lets you know there's another
Flarm equipped aircraft nearby.
PowerFlarm may still have some issues going by what happened at the
US Seniors recently.
Mike
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Peter
Stephenson (Internode)
Sent: Sunday, 29 April 2012 5:48 PM
To: [email protected]
Subject: Re: [Aus-soaring] Mid Air collision risk
Having been involved with two near hits in the last 10 years, both of which
would have been prevented by a Flarm, it seems bloody stupid not have a 750
Euro unit not installed in *every* aircraft.
PeterS
On 22/04/2012 12:29 PM, S Smith wrote:
> Greetings
>
> If you look in the following database,
>
> http://aviation-safety.net/index.php
>
> which is a wiki and lists aircraft crashes around the world back to
> 1920's
>
> you will find very very very very few mid-airs.
>
>
> So far this year, for 896 recorded accidents there are the following
> only;
>
> 3 - military, training mid-airs 2 were combat jets / 1 was
helicopters
>
> 1- GA, R22 helicopter vs Beechcraft in USA - both landed
safely.
>
> That's it.
> For the whole world.
>
> Now I accept this database is not a complete listing,
>
> and let's remember how many millions of flights there have been in
> that time,
>
> but as a percentage, just 1 GA mid-air out of 896 reported accidents in
last 6 months - a pretty reasonable sample size.
>
> Maybe we should think about the causes of the other 890 too !
>
> and get a sense of proportion.
>
> regards
> Stu
> _______________________________________________
> Aus-soaring mailing list
> [email protected]
> To check or change subscription details, visit:
> http://lists.internode.on.net/mailman/listinfo/aus-soaring
>
_______________________________________________
Aus-soaring mailing list
[email protected]
To check or change subscription details, visit:
http://lists.internode.on.net/mailman/listinfo/aus-soaring
_______________________________________________
Aus-soaring mailing list
[email protected]
To check or change subscription details, visit:
http://lists.internode.on.net/mailman/listinfo/aus-soaring
Borgelt Instruments - design & manufacture of quality soaring
instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
_______________________________________________
Aus-soaring mailing list
[email protected]
To check or change subscription details, visit:
http://lists.internode.on.net/mailman/listinfo/aus-soaring
