At 06:50 AM 5/11/2009, you wrote:
Yes after a quick scan through I thought a lot of the figures were
familiar (changed the old Hawk to an F18, though).
And further to Wombat's third paragraph the BASI report came out at
a time, if my memory is somewhat correct, when there was a change in
radio procedures and a greater reliability on radio separation was
being recommended by BASI/CASA or whoever they were at the time.
There was some small controversy at the time and I admit that I was
on the side of "see and avoid" trumps radio. Even recall having
arguments with at least one local aeroclub pilot.
I notice since that report originally came out though, "see and
avoid" has morphed into "unalerted see and avoid". This was due, I
think, to the disparaging that "see and avoid" got from this
particular report and the subsequent reliability on radio _alone_
which followed in the subsequent years.
Note also that I am not saying that the report is factually wrong,
it is a good collection of research and does show some real
limitations of human vision. The problem was that, at the time, it
was used as a sledge hammer and the alternate reliance on radio also
had significant limitations which, just as Wombat noted, were never
acknowledged.
Regards
SWK
Yeah Steve,
Another article with an agenda to do with the November 1993 changes
to airspace procedures.
Much like the absolute garbage about climate change in the media like
the Kilamanjaro article in the Australian yesterday. Yes the snow on
Kilamajaro is disappearing and it is caused by people but it is due
to land clearing in the surrounding areas, which means less
evapo-transpiration and drier air being carried up the mountain by
upslope winds hence less snow so the removal rate by sublimation
exceeds the deposition rate, not CO2 induced (or any other kind of)
warming. This has been well known for years.
Macca, get your eyes checked. You obviously missed the numbers down
the left of the graph.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since 1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email: [email protected]
website: www.borgeltinstruments.com
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