Perseverance Launch & Cruise |
Perseverance Launch & Cruise |
Jul 22 2020, 06:29 PM
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#1
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Word today that the MMRTG has been installed on the rover, so seems like a good time to start the launch thread. Launch currently scheduled for 30 Jul, 2-hr window opening at 1150 GMT.
GO PERSEVERANCE!!! -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Nov 19 2020, 02:38 AM
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#2
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Member Group: Members Posts: 316 Joined: 1-October 06 Member No.: 1206 |
I thought these cruise shots were illuminated by an LED, but I could be wrong.
P |
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Nov 24 2020, 07:20 PM
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#3
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
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Nov 25 2020, 12:50 AM
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#4
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Member Group: Members Posts: 706 Joined: 22-April 05 Member No.: 351 |
There's no LED illumination out the back of the rover. That illumination is coming through gaps in the backshell Obviously this isn't true, but I would have thought that gaps would allow super heated gasses to enter the backshell during entry. -------------------- |
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Nov 25 2020, 04:04 AM
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#5
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Member Group: Members Posts: 611 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
Obviously this isn't true, but I would have thought that gaps would allow super heated gasses to enter the backshell during entry. It's perhaps surprising, but there is a vent hole in the backshell - you have to let the air escape during launch to avoid a pressure differential that could cause structural failure. The same hole (the ~30cm dark circle you can see on backshell images, but there is some sort of wire mesh/filter, so the effective area is only 600cm2 or so) allows the aeroshell to repressurize during entry/descent, but this is slower. Attention is paid to avoid sensitive items being exposed to that repressurization flow, but it is relatively slow (effectively it just sips at the wake, it isnt exposed to the dynamic pressure on the heat shield). I managed to put together some info on this sort of venting in a recent paper (email me if you can't access) https://arc.aiaa.org/doi/abs/10.2514/1.A34861 |
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