At T+2:55 in the GPS III, the two views show a stuttering or stroboscopic effect.
<URL:https://youtu.be/QJXxVtp3KqI?t=1364>
If just the booster camera did this, I'd guess a signal issue, but you can see in 2nd stage camera, below the MVac, that there's actually a flashing, apparently illumination of the 1st stage by the exhaust.
I haven't seen this before. Does anyone know more about it? The MVac view shows the exhaust as mist before this, but the exhaust is nearly clear as the flashing occurs, so any stuttering of the exhaust would be hard to see.
On Saturday, Snidely yelped out that:
At T+2:55 in the GPS III, the two views show a stuttering or stroboscopic
effect.
<URL:https://youtu.be/QJXxVtp3KqI?t=1364>
On 2021-07-04 19:50, Snidely wrote:
On Saturday, Snidely yelped out that:
At T+2:55 in the GPS III, the two views show a stuttering or stroboscopic >>> effect.
<URL:https://youtu.be/QJXxVtp3KqI?t=1364>
1- not sure that the 2 camera s are time synchronized in the live feed.[...]
Having said this, at 2:46, you can see bright light get bigger on left,
At 2:48, the bright light diminishes just as the grey cloud out of stage
2 engine bell diminishes.
My take: exhaus from stage 2 collected into the stage 1 cavity and
burned there with unclean burn (orange glow).
JF Mezei is guilty of <emsEI.33017$NP.22203@fx42.iad> as of 7/4/2021 5:27:54 PM
On 2021-07-04 19:50, Snidely wrote:[...]
On Saturday, Snidely yelped out that:
At T+2:55 in the GPS III, the two views show a stuttering or stroboscopic >>>> effect.
<URL:https://youtu.be/QJXxVtp3KqI?t=1364>
1- not sure that the 2 camera s are time synchronized in the live feed.
Having said this, at 2:46, you can see bright light get bigger on left,
At 2:48, the bright light diminishes just as the grey cloud out of stage
2 engine bell diminishes.
For which video?
[...]
My take: exhaus from stage 2 collected into the stage 1 cavity and
burned there with unclean burn (orange glow).
I'm am not sure that all the samples show the orange glow being restricted to /inside/ the interstage. I require more convincing of this explanation.
<URL:https://youtu.be/QJXxVtp3KqI?t=1364>
I'm am not sure that all the samples show the orange glow being
restricted to /inside/ the interstage.
On 2021-07-05 17:14, Snidely wrote:
<URL:https://youtu.be/QJXxVtp3KqI?t=1364>
I'm am not sure that all the samples show the orange glow being
restricted to /inside/ the interstage.
Well, the shape of the orange glow matches the area at the top of the
Falcon 9, an area that is the forward edge of the interstage.
There are also a couple of frames after the first very bright light
where you see orange glow in the "metal" part on the lower portion of
the image on left. This part is definitely near camera and definitely
inside the interstage.
If you look at the initial "bright light", only the inside cylinder
lights up to fuill white, while that metal part in lower portion of
image does not change colour.
Then, as the second stage engine bell ceases to create itense light,
yuou start to see orange colouring of the metal part at bottom of left
image AS well as one small part of the piole in middle of cyclinder.
And that point, the image from stage 1 shows stage 1 interstage is dark.
But 2 frames later, the stage 1 view has orange that spreads quickly and brightens to white. At that point on stage 2 camera, you see the orange
glow spread from about 2'oclose position in the falcon 9, to dark, then almost full orange, with, if you look carefully, the middle pole and
"tripod" visible. (so this indicates that the glow is from behind that tripad/pole in interstage).
Also, at that point, that lower "metal" portion on left image is mostly normal cllour, except for rightmost part that has bright orange glow.
Eventually, looking at image fro stage 2, you see flashing of the
orange glow. On the Stage 1 camera on left, this is likely affected by rolling shutter artifact.
Rolling shutter: a camera's CCD doesn't campute the 12 megapixels (or
whateer resilution) all at once. Each pixel is sensed serially. This
takes time.
Consider you going in a car at speed and having camera pointed to the
side and you take picture of a tree. If the CCD goes from top to bottom,
the tree will appear to lean forward. This is because you moved between
the time the topmost pixels were registered and when the bottom pixels
were done.
In this case, the cameas scan from bottom to top (at least in the orientattion presented to us). My guess is that there were a succession
of very short flashes/explosions of O2/kerosene. The camera's CCD was
slow enough that it would capture a flahs on only a portion of image and
by the time the CCD was finished scanning a frame, the flash had ceased
and you could see more normally.
For the stage 1 camera, this represents full field of vision. For stage
2, at that point, the end of flaacon 9 from which the orange glow is
emitted represents only a small part of its fiueld of vision, so the CCD
scan of the part of image covering the falcon 9 takes far less time
compared to CCD scan of the full frame.
Also of note: initially before stage 2 ignites, you see only the loose
wires that have just been severed. At the end, before they cut to
another camera, the left camera also shows a wider strap flappiong about.
So it looks to me that there was stuff from stage2 engine beel being
thrown at the interstage area, and it ignited at first on larger bursts
and then very short burst and then quiet.
But it seems to me that there was "wind" in the interstage to cause the
wires to move that way and for a flap to later show up.
But it seems to me that there was "wind" in the interstage to cause the
wires to move that way and for a flap to later show up.
But it seems to me that there was "wind" in the interstage to cause the
wires to move that way and for a flap to later show up.
JF Mezei noted that:
But it seems to me that there was "wind" in the interstage to cause the
wires to move that way and for a flap to later show up.
Since I've been watching recent EVAs, I've seen plenty of lines flapping outside the ISS. No wind, just an impulse imparted through an anchor point.
JF Mezei is guilty of <emsEI.33017$NP.22203@fx42.iad> as of 7/4/2021 5:27:54 PM
On 2021-07-04 19:50, Snidely wrote:[...]
On Saturday, Snidely yelped out that:
At T+2:55 in the GPS III, the two views show a stuttering or stroboscopic >>>> effect.
<URL:https://youtu.be/QJXxVtp3KqI?t=1364>
1- not sure that the 2 camera s are time synchronized in the live feed.
Having said this, at 2:46, you can see bright light get bigger on left,
At 2:48, the bright light diminishes just as the grey cloud out of stage
2 engine bell diminishes.
For which video?
[...]
My take: exhaus from stage 2 collected into the stage 1 cavity and
burned there with unclean burn (orange glow).
I'm am not sure that all the samples show the orange glow being restricted to /inside/ the interstage. I require more convincing of this explanation.
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