[Ground-station] pop quiz!

[Douglas Quagliana]

Friends,

Even if you know the history, you might not have seen the actual blueprints, and you still have to find it in the blueprints. 

Regards,
Douglas

> On Jun 11, 2018, at 6:59 AM, Michelle Thompson via Ground-Station <ground-station at lists.openresearch.institute> wrote:
> 
> Good question - post with a generous spoiler alert style header. Cc Phil for a faster reply.
> 
>> On Mon, Jun 11, 2018, 04:52 Zach Leffke via Ground-Station <ground-station at lists.openresearch.institute> wrote:
>> Do you want answers (or attempts at answers) on the list or direct to you?
>> 
>> 
>> -Zach, KJ4QLP
>> Research Associate
>> Aerospace Systems Lab
>> Ted & Karyn Hume Center for National Security & Technology
>> Virginia Polytechnic Institute & State University
>> Work Phone: 540-231-4174
>> Cell Phone: 540-808-6305
>>> On 6/8/2018 10:36 PM, Michelle Thompson via Ground-Station wrote:
>>> Phil Karn KA9Q has been working on something fun for us. If you enjoy this quiz, please feel free to share it and let him know!
>>> 
>>> Given the documents that you can find at: https://github.com/phase4space/AO-10-blueprints
>>> 
>>> Quiz for fans of the AMSAT Phase IIIB/AO-10 blueprints
>>> Phil Karn, KA9Q
>>> 
>>> Question 1: AO-10 carried a 400-newton kick (rocket) motor that used hypergolic propellants. It was fired only once, but the burn duration was 1.68 times longer than planned. Why? (Note: the burn did *not* end because of propellant depletion.)
>>> 
>>> The cause can be discerned from the prints; i.e., it was a hardware problem, not a software bug or operational mistake.
>>> 
>>> Optional hint 1: The burn was timed in hardware.
>>> 
>>> Question 2: The ground test of the hardware consisted of successfully executing a maximal length burn. What tests could have revealed it?
>>> 
>>> Question 3: Although the first burn did not deplete the propellants, it was not possible to fire the engine again because of insufficient helium pressure. Why? (Hint: the cause was not insufficient helium loading before launch.)
>>> 
>>> 
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>> 
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