I've done a bit more research on this subject since my previous post. Most
modern jet airliner engines are designed to withstand several bird strikes -
the blades these days tend to be carbon fibre or other modern material and
they are incredibly strong. However, no jet engine will withstand multiple
simultaneous or near simultaneous strikes that you get from a collision with
a flock of birds.
Paul Dodd
Docklands, Victoria
-----Original Message-----
From:
On Behalf Of Paul Dodd
Sent: Saturday, 20 June 2009 9:16 PM
To: 'Greg Little'; 'Tony Russell'; 'Chris Sanderson'; 'Carl Clifford';
'Birding-Aus (Forum)'
Subject: Canada Goose Cull
Greg, Tony,
Whilst this idea sounds good, it is impractical really. The minimum speed
for most modern jet airliners is around 140-150 knots (280-300km/h). Within
a short time after takeoff (or before landing) the planes are probably
travelling at something like 180-200 knots (360-400 km/h). When a bird
weighing 3-4kg hits anything at 360-400 km/h it does an incredible amount of
damage. Hitting mesh in front of an engine will most likely result in both
the bird and the mesh entering the engine intake - which will cause more
damage than the bird alone.
Experiments have been made with mesh, but mostly to allow tactical jet
fighters to operate from "rough" strips (read grass runways). They have
never proved to be useful for anything like preventing a duck, swan or goose
from entering a jet intake.
Paul Dodd
Docklands, Victoria
-----Original Message-----
From:
On Behalf Of Greg Little
Sent: Saturday, 20 June 2009 3:22 PM
To: 'Tony Russell'; 'Chris Sanderson'; 'Carl Clifford'; 'Birding-Aus
(Forum)'
Subject: Canada Goose Cull
Tony
When on a flight interstate recently I thought exactly the same thing.
Why couldn't a sturdy mesh cone or grid of some sort be fitted over the
front of the engine intake to deflect birds, at least above a certain
size? Surely the experts must have thought of this? Maybe there are good
reasons why it is not feasible.
Greg Little
Greg Little - Principal Consultant
General Flora and Fauna
PO Box 526
Wallsend, NSW, 2287, Australia
Ph 02 49 556609
Fx 02 49 556671
www.gff.com.au
-----Original Message-----
From:
On Behalf Of Tony Russell
Sent: Saturday, 20 June 2009 2:23 PM
To: 'Chris Sanderson'; 'Carl Clifford'; 'Birding-Aus (Forum)'
Subject: Canada Goose Cull
In the same way as we stop spam and viruses getting through into our PCs
airliners should have bird filters fitted to the engine intakes.
-----Original Message-----
From:
On Behalf Of Chris Sanderson
Sent: Saturday, June 20, 2009 1:07 PM
To: Carl Clifford; Birding-Aus (Forum)
Subject: Canada Goose Cull
While in no way defending the cull (which I also think is ridiculous),
I'd like to point out that if airlines could avoid bird strikes they
would. A single White Ibis strike on the Gold Coast a few years back
was estimated to have cost Qantas about $3 million dollars, and any
strike where a bird is ingested into engines is heinously expensive, not
just in terms of mechanical repairs, but lost staff and flight time,
replacement aircraft, and reworking logistics. Believe me when I say if
this were as simple as putting money into it, the problem would have
been solved years ago.
Regards,
Chris
On Sat, Jun 20, 2009 at 1:03 PM, Carl Clifford
<>wrote:
> Most major bird strikes such as the recent one in New York, don't
> happen within the precincts of an airport, so how do the airlines
> expect the airports to control birds there? I believe there have been
> bird strikes recorded at altitudes of between 6-10,000 metres, and an
> aircraft has been recorded as hitting a Rüppells Vulture at 11,000+
> Metres over Africa. I think it is about time the airlines faced up to
> their responsibilities. But then they cost money, don't they.
>
> Carl Clifford
>
>
> On 20/06/2009, at 12:41 PM, Stephen Ambrose wrote:
>
> the major airline companies take an alternative point of view. Their
> view is that they pay the airport authorities a lot of money to land,
> depart and "park" their planes at airports. Therefore, they believe it
> is the responsibility of the airports to provide a safe environment
> (air-space around the airport) when planes are taking off or coming
into
> land.
>
>
> Stephen Ambrose
> Ryde, NSW
>
>
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