Re: nasa-celebrates-successful-mars-landing

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#133

From: Grant Edwards
Date: Tue, 07 Aug 2012 14:07

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On 2012-08-07, Sylvia Else <sylvia@not.here.invalid> wrote:
> On 7/08/2012 8:56 AM, Grant Edwards wrote:

>> The commentators kept yammering on about how there was "zero margin
>> for error", and how "absolutely everything has to work right".
>>
>> Really?  A design with _zero_ safety margin?  Who signs off on a
>> system design or mission plan like that?
>>
>> I'm pretty sure that the "absolutely everything has to work right" is
>> also bullshit.  I heard several people who seemd know know which way
>> was up talking about redundancy in the hardware design, the software
>> design, and in the mission planning itself.
>
> Even the animated video of the skycrane clearly shows the rockets in 
> pairs, with only one of each pair in use.

Same for the attitude thrusters on descent stage used to steer during
the pre-parachute entry phase.

-- 
Grant Edwards               grant.b.edwards        Yow! I'm pretending I'm
                                  at               pulling in a TROUT!  Am I
                              gmail.com            doing it correctly??

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From: Grant Edwards <invalid@invalid.invalid>
Newsgroups: sci.electronics.design,aus.electronics,comp.arch.embedded
Subject: Re: nasa-celebrates-successful-mars-landing
Date: Tue, 7 Aug 2012 14:07:20 +0000 (UTC)
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