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Aeroplane 'vroops'
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markrkingston1Offline
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Joined: 04 Aug 2007
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PostPosted: 13-05-2014 14:15    Post subject: Reply with quote

rynner2 wrote:
markrkingston1 wrote:
I think that it is more common in warmer (warm, still) weather but I could not say for sure.

You'll get a chance to test this in the next few days, as a high pressure system is expected to settle over Britain, with light winds and warmer temperatures.


Fingers crossed. Smile
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pornosonic1975Offline
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PostPosted: 27-05-2014 19:24    Post subject: Reply with quote

I'm certain that it's just the autothrottle and a an increase/decrease in airflow into the engine.

It's a hardly worthy of a 'It happened to me'.
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markrkingston1Offline
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PostPosted: 28-05-2014 05:36    Post subject: Reply with quote

pornosonic1975 wrote:
I'm certain that it's just the autothrottle and a an increase/decrease in airflow into the engine.

It's a hardly worthy of a 'It happened to me'.


It's not on a par with, say, an alien invasion but it's nevertheless of Fortean interest in my opinion. Wink

Update: I've been keeping an ear out for them but no vroops recently that I've heard.
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skinnyOffline
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PostPosted: 28-05-2014 09:11    Post subject: Reply with quote

I really like the thread title. Great word. Vroops.

We're on a hillside near the top of a valley, so the sound wave travelling across that landscape may contribute to some of the very clear Vroooops we hear. In other areas I only recall the regular doppler.
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markrkingston1Offline
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PostPosted: 28-05-2014 15:35    Post subject: Reply with quote

skinny wrote:
I really like the thread title. Great word. Vroops.


Yes, it's very onomatopoeic!
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milk23Offline
will ye parlez??
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PostPosted: 28-05-2014 18:49    Post subject: Reply with quote

Quote:
It's a hardly worthy of a 'It happened to me'.


But it did happen to me. I experienced an inexplicable vroop.

Is there a more specific criteria I am unaware of for this section? I don't think the right form of investigative pluck is being employed when we discount such a thing as

Quote:
I'm certain that it's just the autothrottle and a an increase/decrease in airflow into the engine.


You're 'certain' it's something or something else?
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bunnymousekittOffline
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PostPosted: 11-07-2014 10:45    Post subject: Reply with quote

The other day, the family and I were taking a walk though the neighborhood when we heard this terrible moaning sound emerging (apparently) from the dry creek bed next to the road. It increased in volume briefly then ended in a distinct "vroop". Sure enough, seconds later we could hear the sound of a plane high overhead. The creek bed had caught the echo somehow and made that god-awful noise.

If I hadn't remebered this thread, we'd probably be having some sleepless nights, wondering what was lurking in that creek! Laughing
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markrkingston1Offline
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PostPosted: 11-07-2014 14:43    Post subject: Reply with quote

Still no vroops here, sorry, but have been listening.
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drbatesOffline
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PostPosted: 12-07-2014 17:51    Post subject: Reply with quote

bunnymousekitt wrote:
The other day, the family and I were taking a walk though the neighborhood when we heard this terrible moaning sound emerging (apparently) from the dry creek bed next to the road. It increased in volume briefly then ended in a distinct "vroop". Sure enough, seconds later we could hear the sound of a plane high overhead. The creek bed had caught the echo somehow and made that god-awful noise.

If I hadn't remebered this thread, we'd probably be having some sleepless nights, wondering what was lurking in that creek! Laughing


Something, obviously, that heard the plane before you did and was discouraged from attacking by it for some reason.
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markrkingston1Offline
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PostPosted: 31-07-2014 12:42    Post subject: A vroop, a vroop! Reply with quote

At last, a vroop has occurred!

Ok, here is what I can tell you. I was in an upstairs bedroom in my house in north
west London when I heard an aircraft flying overhead. There is nothing unusual
(this location is under the flight path into Heathrow) but this time it
emitted a vroop. First one I've heard for ages. I checked the time and
it was 12:39.

For clarity, a "vroop" in my experience is a kind of loud groaning noise, with a rising
and falling part, but short in duration (usually less than a second). If I remember
correctly, this one was actually a double-vroop: It has two rising and falling parts,
one immediately following the other.

I had a choice of rushing to the garden to see the aircraft or rushing to the
computer to check Flightradar24 and I chose the computer.

I reached the computer at 12:41 and it was clear which aircraft was
responsible: It was a British Airways Boeing 767-336(ER), flight BA903, flying
from Frankfurt to Heathrow, descending and decelerating rapidly on its
approach into Heathrow.

I believe the "descending and decelerating rapidly" is key to the
production of vroops.

Using FL24's backtrack feature I was able to estimate that at 12:39 when
the aircraft was closest to me it was at 6050 feet, 253 knots, -896 fpm
vertical speed, on a 99 deg heading.

Just two minutes later when the screenshot below was produced (12:41)
it was at 4275 feet, 178 knots, -256 fpm vertical speed, and on a
232 deg course.

As you can see, both descent and forward deceleration were indeed rapid.

I hope this has been informative. Smile

http://www.signal100.com/markr/misc/vroop/BA903_track_20140731_1141.jpg

A couple of notes:
(1) The time on FR24 is UTC, so 12:39 local time is 11:39 UTC.
(2) My location is under the aircraft track, on the A5 and roughly
1.5 miles south east of the Welsh Harp reservoir and the start
of the M1. I know the Welsh Harp and the A5 are not labelled
on this map but I'm sure you can manage to find them with
Google's help. Wink
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