נמצא קשר בין מהירות טיסת ד-2 למינרי למעוף ציפורים
מצ"ב קטע שפורסם ב SCAT לפיו הצליל שטיסן LDA יוצר במהלך השיגור מושך אליו שקנאים ותאורת הלדים המצנצת עשויה לגרום להפלות...
יש גם הצעה להגביל את מהירות השיגור .....
בשורה לטיסנאי הגומי והמנוע - טיסני ג2 ו-מ2 לא מפריעים לשקנאים
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Fellow Fliers,
It was clear that after an incident at Lost Hills this year that we have a
potential environmental time-bomb on our hands.
I think it was the PanAm flyoff for F1A when the pod of pelicans came over.
And rather nice they were as well, however, i become clear that their
flight path was being affected by the models launching and I wondered why.
With some help from a consultancy doing acoustics simulations for the
company I work for, and also getting in contact with old friends at the
Birdstrike Avoidance Team (BAT) at Sand Hutton, GB, it is now clear to me
that the sounds being made by the new low drag A2s is affecting these
animals.
My friends at BAT, most of them are ornithologists, (I worked with them
years back on aircraft impact studies) have a lot of data on birds and have
a database on the sonic frequencies most susceptible to which species. I
played them the video of work done by Van Wallane and others at Delft
University (see Facebook for details) and the ?whistling? model and the
confirmed that this frequency is slap bang in the middle of the pelican?s
hearing frequency. In simple terms, LDAs being launched have and will
continue to attract birds, generally pelicans, as they are being launched
at high speed.Those watching the flyoff and noting how the birds changed
direction as first one then another model was launched may have thought
this was coincidence, I did, but it would seem the models noise literally
?attract? the birds. This is not good news at the Brown Pelican is
protected by the Migratory Bird Treaty Act of 1918 and so any disturbance
is a federal offence in the US.
I also asked the BAT team about strobe lights and they almost went
ashen-faced. They suggested we stopped using them immediately in the main
migration season as a minimum as they can cause miss-carriages.
We need to do something about this but without too much advertising. Maybe
the guys at Delft know how to reduce the LDA sound signature (anti-noise
perhaps ?) but it is clear in the short term that launch velocities need to
be limited so that the critical frequency is not reached, and that strobes
are even banned. Perhaps we can tie in some sort of speed meter to the
timer systems, like the energy limiters in F1Q, and make these mandatory
from 2013 ?The risk I fear otherwise is that we find that all flying is
banned until research proves we are not a problem ? and you know how long
that can take.
I did also play the ornithologists recordings of F1B and F1C but apparently
these aren?t a problem.
I write this to elicit a suitable response from the flyers worldwide and
hope that there may be some experts out there that can help us before it is
too late.
EoB
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