Oggy

Joined: 26th December 2008

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Oggy
karma mechanic wrote:
Official Boeing 747-400 cruising speed - 567 mph (Mach 0.85) from: http://www.boeing.com/commercial/747family/pf/pf_400_prod.html
Other sources give Mach 0.855 with a max of 0.92.

Still doesn't shed much light on what the object is though
Indeed not.

As I ran through the figures I was surprised how similar the angular velocities were. I have seen the space station twice and my perception was that it was significantly faster.

I am convinced what I saw was a balloon of some sort. Unfortunately I have lost most of my contacts in the aircraft industry so I could not find out any more.

Comment by Oggy posted on What in the world is this "thing"? at 23/03/2011 - 22:18

Oggy
The perceived rate of transition is a function of groundspeed ie airspeed + the component of wind acting parallel to the track of the aircraft. Assume there is no wind then first example you quote comes out at around Mach 0.9 and the second about Mach 0.85.

I do not remember commercials being that fast.

Comment by Oggy posted on What in the world is this "thing"? at 23/03/2011 - 19:54

Oggy
600mph for a commercial would require a bit of a tailwind.

Comment by Oggy posted on What in the world is this "thing"? at 23/03/2011 - 19:10

Oggy
When I saw the ISS, it was travelling somewhat faster than an airliner (about 19000mph :shock and it has a gold colour.

Comment by Oggy posted on What in the world is this "thing"? at 23/03/2011 - 17:20

Oggy
Hi Ian

I was about 7 when I went to my first airshow and was the only one in my age group standing there with a big grin as the Lightning roared down the runway and pitched 85deg nose up. Everyone else was bawling their eyes out. I was in the RAF for a while and have done 20 years in flight simulation, so I claim some spotter points as well.

I have had a look at Google images and the nearest I can find to what I saw is this(go to page three).

Don - wise man.

Comment by Oggy posted on What in the world is this "thing"? at 23/03/2011 - 13:25

Oggy
Since there is nothing else in the picture it is impossible to tell how big it is as you have no reference. The circle of confusion is therefore irrelevant.

I used my eyes to reference the size against a known object (a 747).

Welcome back Anvh

Comment by Oggy posted on What in the world is this "thing"? at 22/03/2011 - 20:48

Oggy
Last attempt -

[IMG]http://i217.photobucket.com/albums/cc222/Oggy3323/IMGP0365a.jpg[/IMG]

Comment by Oggy posted on What in the world is this "thing"? at 22/03/2011 - 20:08

Oggy
Gwyn wrote:
...Of course the clocks change at the weekend...
Whoohoo!! Barbeque season.

Comment by Oggy posted on Another pointless thread at 22/03/2011 - 20:07

Oggy
thoughton wrote:
Oggy your one looks a lot like the lunar module reentering the earth, with the triple balloon above it. What year did you say you took this photo again?
May 2009, and it's over Sussex (probably in the middle of Gatwick controlled airspace :shock, so probably not. I'll have another go at PPing it when I get home and see if I can do a better job.

Comment by Oggy posted on What in the world is this "thing"? at 22/03/2011 - 15:44

Oggy
Just to put my sighting in context, comparing it to a to a 747 in the sky I would estimate it at something around 200ft tall.

Chinese lantern - no.

Comment by Oggy posted on What in the world is this "thing"? at 22/03/2011 - 12:29

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