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Skylon

By Skylon
in Science & Spaceflight

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darthgently

darthgently

Posted
Posted
1 hour ago, tater said:

Except it's crappy with an ad blocker to the point of uselessness at this point.

I forgot about that being on premium.  But yeah, the entire YouTube interface has so many annoyances.  Why isn’t add to watch later available for shorts?  Why do some browse screens label vids as being in your watch queue already and other screens do not?  What happened to the very popular sort queue by duration?

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AckSed

AckSed

Posted
Posted (edited)

I blipped through NSF's stream and an interesting detail is that while Blue Ghost is going for TLI and orbit, arriving in 45 days, ispace's Resilience is heading for Earth-Luna-Sun L1 with several flybys, and will take 4-5 months to reach the moon.

Edited by AckSed
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Ultimate Steve

Ultimate Steve

Posted
Posted

I cannot confirm or deny this, but I have also heard that it could be flight 4 due to the internal arrangement, but I have also heard people say that the hot spots match up with the flaps removed from flight 6. I have not double checked either of these claims, so who knows.

Also while that is certainly not acceptable for an operational vehicle, we don't know the exposure settings of the camera, and some cameras pick up a little infrared as they are imperfect - So it might not be quite as bad as the picture suggests.

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darthgently

darthgently

Posted
Posted
1 hour ago, Ultimate Steve said:

I cannot confirm or deny this, but I have also heard that it could be flight 4 due to the internal arrangement, but I have also heard people say that the hot spots match up with the flaps removed from flight 6. I have not double checked either of these claims, so who knows.

Also while that is certainly not acceptable for an operational vehicle, we don't know the exposure settings of the camera, and some cameras pick up a little infrared as they are imperfect - So it might not be quite as bad as the picture suggests.

Not to mention that the camera itself is getting a bit warm at that point so I’m wondering if the image sensor and other electronics may be running a bit out of spec also.  It certainly wasn’t doing any image stabilization if it was supposed to be doing so (or the vibrations were just too high frequency for the frame rate)

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darthgently

darthgently

Posted
Posted
2 hours ago, JoeSchmuckatelli said:

Might not be all that warm - air is a good insulator 

Not sure.   Radiant heat  from a bonfire caught my boot sole on fire a couple of feet away when I was a kid sitting on the ground.  The wood had really caught and it was a dense bright flame.

If the air is convecting in a closed space you have a convection oven.  Given the heating of the prograde side, it would have been convecting.  As the drag created G force pulling contents prograde (to the hot side), cooler denser air would have “sunk” toward the hot side pushing the lighter heated air toward the camera.

I’m just saying that I think the camera could have gotten fairly hot, not that air isn’t good insulator; I do get your point

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Entropian

Entropian

Posted
Posted
10 hours ago, darthgently said:

Not to mention that the camera itself is getting a bit warm at that point so I’m wondering if the image sensor and other electronics may be running a bit out of spec also.

The primary consequence of warm sensors is a higher read noise across the entire sensor (which, keep in mind, is tiny) and less so local artifacting on parts of the sensor.  If there's any frames available with a completely dark environment at the same exposure, you can do a field subtraction to eliminate some of the noise.  I think that this is largely a nonissue at least compared to the wildly out-of-focus image, which is causing far more data loss than read noise.

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magnemoe

magnemoe

Posted
Posted
5 hours ago, darthgently said:

Not sure.   Radiant heat  from a bonfire caught my boot sole on fire a couple of feet away when I was a kid sitting on the ground.  The wood had really caught and it was a dense bright flame.

If the air is convecting in a closed space you have a convection oven.  Given the heating of the prograde side, it would have been convecting.  As the drag created G force pulling contents prograde (to the hot side), cooler denser air would have “sunk” toward the hot side pushing the lighter heated air toward the camera.

I’m just saying that I think the camera could have gotten fairly hot, not that air isn’t good insulator; I do get your point

I agree except they should be to high to be close to even 0.1 bar at this point. 
But warming your feet with an bonefire while wearing heavy boots is not that smart. Heard of people melting ski boots so the can not put on the skis afterward. 

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darthgently

darthgently

Posted
Posted
14 minutes ago, magnemoe said:

I agree except they should be to high to be close to even 0.1 bar at this point. 
But warming your feet with an bonefire while wearing heavy boots is not that smart. Heard of people melting ski boots so the can not put on the skis afterward. 

I wasn’t the smartest kid, I was the coldest kid on my first winter camp in trip in the Rockies! :)

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