ExoMars |
ExoMars |
Guest_Sunspot_* |
Aug 25 2005, 11:22 AM
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#501
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http://news.bbc.co.uk/1/hi/sci/tech/4180840.stm
Europe has fixed on a concept for its next mission to land on the Red Planet. It aims to send a single robot rover to the Martian surface along with another, stationary, science package. |
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Aug 11 2019, 06:30 AM
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#502
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
I think the complexity comes from the fact that neither ESA nor RSA have flown a successful very large Martian 'chute before, so I can understand the desire to 'stage' them with something small and tough, followed by something larger that doesn't have to be strong enough to handle the supersonic deployment. The LDSD deployment used that balute first as a drogue, to then pull out the main (but had two failures of the mains)
I'm at a loss as to how they got to the Drogue-1st Stage Main-Drogue 2-2nd Stage Main four chute design. I'm sure they're not doing it for fun. The ExoMars EDM had a Disk-Gap-Band canopy of 12m.....but they're not re-using that flight proven design at all (it would make sense as a 1st Stage Main chute - instead they've developed a new 15m chute) The final Rover EDL chute is for some reason, 35m across. That's more than 50% larger than the MSL 19.7m parachute despite being a lighter entry vehicle. This was a concern I had about the EDM being so close to the rover mission....there simply isn't the time to take the lessons learned from EDM and then apply those to the design of the rover EDL. |
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Aug 12 2019, 07:59 AM
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#503
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Member Group: Members Posts: 611 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
I'm at a loss as to how they got to the Drogue-1st Stage Main-Drogue 2-2nd Stage Main four chute design. I'm sure they're not doing it for fun. I had the same reaction - in a comment at IPPW I described this design as 'baroque'. Introducing an extra serial step introduces another failure point - the tradeoff presumably being the ability to nudge all of the elements in the chain further from operating environments (Mach, q, Re etc.) in which they are known to fail..... |
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