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MSL Cruise Phase
elakdawalla
post Jun 19 2012, 12:16 AM
Post #181


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Folks, I will be hosting a "Cosmoquest Science Hangout" Wednesday at 1600 PDT/2300 UTC, with guest Ravi Prakash of the MSL EDL team. I'll ask him to explain EDL in detail with particular emphasis on the parts that are different from MER (and why they're different from MER). The Hangout will go straight to Youtube so if you can't watch live you'll be able to watch the recording right away. Post here if you have any burning questions you'd like me to ask him. My hope for this Hangout is to produce a video that we can point people to if they have lots of questions about EDL and why they're doing this crazy Skycrane thing.

http://www.planetary.org/blogs/emily-lakda...vi-prakash.html


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brellis
post Jun 19 2012, 01:05 AM
Post #182


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The 'presentation' in pospa's Post #166 has an excellent graph on page 4 comparing the vertical+horizontal velocities of various spacecraft that made it successfully to the surface of Mars. Wow! In comparison, Beagle and the MERs look like they're bouncing a very long way!

Question: in case something goes even slightly awry during the SkyCrane phase of landing, how much more velocity can MSL take than the 0.75 vertical or 0.5 horizontal 'requirements' referred to in the presentation? Can it take a Viking level of velocity in the drop to the surface? btw, the more time I spend rereading this thread, the less worried I become! smile.gif
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ElkGroveDan
post Jun 19 2012, 01:52 AM
Post #183


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Emily you might ask him to also compare and contrast Viking and MPL/Phoenix as well since they have the powered final descent in common.


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djellison
post Jun 19 2012, 04:56 AM
Post #184


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The MSL descent stage MLE's are infact derived from Viking engines, but with a monolithic single large nozzle rather than a cluster of many smaller nozzles.

The Phoenix descent engines were derived from large RCS thrusters I believe (hence the pulse, not throttle) and were stolen from the '01 lander to be the orbit insertion engines for MRO and had to be replaced on PHX.

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Astro0
post Jun 23 2012, 10:45 AM
Post #185


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Not only 7 Minutes of Terror but another 13 minutes and 48 seconds until the signal gets back to Earth ( to CanberraDSN btw) and we know that the terror is over.
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SteveM
post Jun 23 2012, 05:10 PM
Post #186


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About 20 seconds in as the narrator discusses how everything has to go perfectly, the image displays the text: "500,000 LINES OF COD3". Beautiful. laugh.gif
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nprev
post Jun 23 2012, 05:35 PM
Post #187


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Well, it's been a great cruise phase! The approach phase begins on 23 June; please post all relevant comments here.


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