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Why jettison the data recorders in the Orion AA2 abort test?

Why no parachutes in the Orion AA2 abort test?What is the purpose of the Dream Chaser carry test?Why is SpaceX testing Pad Abort at LC-40 (CCAFS) but Max-Q abort at Vandenberg?Did Orion do a pad abort test? A live fire abort test?Are the Orion and the CST-100 basically the same spacecraft?Why will SpaceX do Pad Abort test from a truss, not a real first and second stage?How has the Dragon v2 been tested before its launch pad abort test?Why does SpaceX have a launch window for a pad abort test?Why is the SpaceX Pad Abort test starting at ground level?What Dragon was used in May 2015 Pad Abort test?Why no parachutes in the Orion AA2 abort test?

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3

$begingroup$

This answer states parameters were transmitted in real time.

Thus, why was it needed to record them onboard into (perhaps complex) data recorder that are then jettisoned (with a probability of failure for each ejection)?

I think it should have been easier to either only record onboard on data recorder that are then recovered (like in any aircraft crash, technology already widely used and tested) or either only transmit in real time to ground site (like for any telemetry widely used for orbital launch).

testing orion-spacecraft

share|improve this question

edited Jul 4 at 8:26

DrSheldon

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asked Jul 4 at 8:20

Manu HManu H

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$endgroup$

add a comment | 

3

$begingroup$

This answer states parameters were transmitted in real time.

Thus, why was it needed to record them onboard into (perhaps complex) data recorder that are then jettisoned (with a probability of failure for each ejection)?

I think it should have been easier to either only record onboard on data recorder that are then recovered (like in any aircraft crash, technology already widely used and tested) or either only transmit in real time to ground site (like for any telemetry widely used for orbital launch).

testing orion-spacecraft

share|improve this question

edited Jul 4 at 8:26

DrSheldon

10.1k22 gold badges3737 silver badges9393 bronze badges

asked Jul 4 at 8:20

Manu HManu H

1,3901313 silver badges3030 bronze badges

$endgroup$

add a comment | 

$begingroup$

This answer states parameters were transmitted in real time.

Thus, why was it needed to record them onboard into (perhaps complex) data recorder that are then jettisoned (with a probability of failure for each ejection)?

I think it should have been easier to either only record onboard on data recorder that are then recovered (like in any aircraft crash, technology already widely used and tested) or either only transmit in real time to ground site (like for any telemetry widely used for orbital launch).

testing orion-spacecraft

share|improve this question

edited Jul 4 at 8:26

DrSheldon

10.1k22 gold badges3737 silver badges9393 bronze badges

asked Jul 4 at 8:20

Manu HManu H

1,3901313 silver badges3030 bronze badges

$endgroup$

share|improve this question

edited Jul 4 at 8:26

DrSheldon

10.1k22 gold badges3737 silver badges9393 bronze badges

asked Jul 4 at 8:20

Manu HManu H

1,3901313 silver badges3030 bronze badges

share|improve this question

edited Jul 4 at 8:26

DrSheldon

10.1k22 gold badges3737 silver badges9393 bronze badges

asked Jul 4 at 8:20

Manu HManu H

1,3901313 silver badges3030 bronze badges

edited Jul 4 at 8:26

DrSheldon

10.1k22 gold badges3737 silver badges9393 bronze badges

edited Jul 4 at 8:26

DrSheldon

10.1k22 gold badges3737 silver badges9393 bronze badges

asked Jul 4 at 8:20

Manu HManu H

1,3901313 silver badges3030 bronze badges

asked Jul 4 at 8:20

Manu HManu H

1,3901313 silver badges3030 bronze badges

2 Answers
2

active

oldest

votes

5

$begingroup$

They are trying to get as much test data back as possible in all cases, including (especially) if the capsule suddenly decided to turn into a fireball.

Yes they transmit as much telemetry as they can bandwidth allowing, but the internal recorders will be store a lot more data points at much higher resolution. Ejecting multiple data recorders increases there chances that at least one of them is found, and therefore their chances of getting the full high resolution data that they are unable to transmit live.

share|improve this answer

answered Jul 4 at 9:42

PeteBlackerThe3rdPeteBlackerThe3rd

31411 silver badge44 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I fail to how the capsule could turn into fireball. I understand it was basically an inert weight with sensors and data recorder, nothing more. Unless this is an expression to say "loss the capsule in a dramatic unforeseen event such as those the rocket science (KSP-science?) can produce".
  $endgroup$
  – Manu H
  Jul 4 at 11:34
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The capsule was inert, but it did have a large solid rocket motor bolted onto it. The point is you always want to be thinking about the worst case scenario, and planning for that.
  $endgroup$
  – PeteBlackerThe3rd
  Jul 4 at 12:08
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Even without fireball, there's still a much greater chance of recovering at least one item if they're small and spread out, rather than all slamming into the same large mass.
  $endgroup$
  – OrangeDog
  Jul 4 at 17:04
  

  
  
  
  

add a comment | 

4

$begingroup$

Telemetry can fail, in which case you must recover the recorders:

1. The capsule simulator was going to hit the water at high velocity, it would have been expensive and an engineering challenge to build recorders that would have survived that impact


2. The capsule would sink to the bottom of the ocean, perhaps in pieces, requiring sea recovery, which is expensive and slow


3. Even the most survivable recorders would be damaged by the impact, soft landing the recorders would mean they'd likely be available for future tests, saving taxpayer money

share|improve this answer

answered Jul 4 at 12:32

GdDGdD

11.5k33 gold badges3636 silver badges5050 bronze badges

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Could you expand the recorder soft-landing part or give links for further reading? (I didn't know they were designed to soft-land)
  $endgroup$
  – Manu H
  Jul 4 at 12:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  If you look at CourageousPotato's answer to your linked question there's details on the recorders @ManuH
  $endgroup$
  – GdD
  Jul 4 at 13:00
  

  
  
  
  

add a comment | 

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5

$begingroup$

They are trying to get as much test data back as possible in all cases, including (especially) if the capsule suddenly decided to turn into a fireball.

Yes they transmit as much telemetry as they can bandwidth allowing, but the internal recorders will be store a lot more data points at much higher resolution. Ejecting multiple data recorders increases there chances that at least one of them is found, and therefore their chances of getting the full high resolution data that they are unable to transmit live.

share|improve this answer

answered Jul 4 at 9:42

PeteBlackerThe3rdPeteBlackerThe3rd

31411 silver badge44 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I fail to how the capsule could turn into fireball. I understand it was basically an inert weight with sensors and data recorder, nothing more. Unless this is an expression to say "loss the capsule in a dramatic unforeseen event such as those the rocket science (KSP-science?) can produce".
  $endgroup$
  – Manu H
  Jul 4 at 11:34
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The capsule was inert, but it did have a large solid rocket motor bolted onto it. The point is you always want to be thinking about the worst case scenario, and planning for that.
  $endgroup$
  – PeteBlackerThe3rd
  Jul 4 at 12:08
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Even without fireball, there's still a much greater chance of recovering at least one item if they're small and spread out, rather than all slamming into the same large mass.
  $endgroup$
  – OrangeDog
  Jul 4 at 17:04
  

  
  
  
  

add a comment | 

5

$begingroup$

They are trying to get as much test data back as possible in all cases, including (especially) if the capsule suddenly decided to turn into a fireball.

Yes they transmit as much telemetry as they can bandwidth allowing, but the internal recorders will be store a lot more data points at much higher resolution. Ejecting multiple data recorders increases there chances that at least one of them is found, and therefore their chances of getting the full high resolution data that they are unable to transmit live.

share|improve this answer

answered Jul 4 at 9:42

PeteBlackerThe3rdPeteBlackerThe3rd

31411 silver badge44 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I fail to how the capsule could turn into fireball. I understand it was basically an inert weight with sensors and data recorder, nothing more. Unless this is an expression to say "loss the capsule in a dramatic unforeseen event such as those the rocket science (KSP-science?) can produce".
  $endgroup$
  – Manu H
  Jul 4 at 11:34
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  The capsule was inert, but it did have a large solid rocket motor bolted onto it. The point is you always want to be thinking about the worst case scenario, and planning for that.
  $endgroup$
  – PeteBlackerThe3rd
  Jul 4 at 12:08
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Even without fireball, there's still a much greater chance of recovering at least one item if they're small and spread out, rather than all slamming into the same large mass.
  $endgroup$
  – OrangeDog
  Jul 4 at 17:04
  

  
  
  
  

add a comment | 

$begingroup$

They are trying to get as much test data back as possible in all cases, including (especially) if the capsule suddenly decided to turn into a fireball.

Yes they transmit as much telemetry as they can bandwidth allowing, but the internal recorders will be store a lot more data points at much higher resolution. Ejecting multiple data recorders increases there chances that at least one of them is found, and therefore their chances of getting the full high resolution data that they are unable to transmit live.

share|improve this answer

answered Jul 4 at 9:42

PeteBlackerThe3rdPeteBlackerThe3rd

31411 silver badge44 bronze badges

$endgroup$

share|improve this answer

answered Jul 4 at 9:42

PeteBlackerThe3rdPeteBlackerThe3rd

31411 silver badge44 bronze badges

answered Jul 4 at 9:42

PeteBlackerThe3rdPeteBlackerThe3rd

31411 silver badge44 bronze badges

answered Jul 4 at 9:42

PeteBlackerThe3rdPeteBlackerThe3rd

31411 silver badge44 bronze badges

4

$begingroup$

Telemetry can fail, in which case you must recover the recorders:

1. The capsule simulator was going to hit the water at high velocity, it would have been expensive and an engineering challenge to build recorders that would have survived that impact


2. The capsule would sink to the bottom of the ocean, perhaps in pieces, requiring sea recovery, which is expensive and slow


3. Even the most survivable recorders would be damaged by the impact, soft landing the recorders would mean they'd likely be available for future tests, saving taxpayer money

share|improve this answer

answered Jul 4 at 12:32

GdDGdD

11.5k33 gold badges3636 silver badges5050 bronze badges

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Could you expand the recorder soft-landing part or give links for further reading? (I didn't know they were designed to soft-land)
  $endgroup$
  – Manu H
  Jul 4 at 12:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  If you look at CourageousPotato's answer to your linked question there's details on the recorders @ManuH
  $endgroup$
  – GdD
  Jul 4 at 13:00
  

  
  
  
  

add a comment | 

4

$begingroup$

Telemetry can fail, in which case you must recover the recorders:

1. The capsule simulator was going to hit the water at high velocity, it would have been expensive and an engineering challenge to build recorders that would have survived that impact


2. The capsule would sink to the bottom of the ocean, perhaps in pieces, requiring sea recovery, which is expensive and slow


3. Even the most survivable recorders would be damaged by the impact, soft landing the recorders would mean they'd likely be available for future tests, saving taxpayer money

share|improve this answer

answered Jul 4 at 12:32

GdDGdD

11.5k33 gold badges3636 silver badges5050 bronze badges

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Could you expand the recorder soft-landing part or give links for further reading? (I didn't know they were designed to soft-land)
  $endgroup$
  – Manu H
  Jul 4 at 12:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  If you look at CourageousPotato's answer to your linked question there's details on the recorders @ManuH
  $endgroup$
  – GdD
  Jul 4 at 13:00
  

  
  
  
  

add a comment | 

$begingroup$

Telemetry can fail, in which case you must recover the recorders:

1. The capsule simulator was going to hit the water at high velocity, it would have been expensive and an engineering challenge to build recorders that would have survived that impact


2. The capsule would sink to the bottom of the ocean, perhaps in pieces, requiring sea recovery, which is expensive and slow


3. Even the most survivable recorders would be damaged by the impact, soft landing the recorders would mean they'd likely be available for future tests, saving taxpayer money

share|improve this answer

answered Jul 4 at 12:32

GdDGdD

11.5k33 gold badges3636 silver badges5050 bronze badges

$endgroup$

share|improve this answer

answered Jul 4 at 12:32

GdDGdD

11.5k33 gold badges3636 silver badges5050 bronze badges

answered Jul 4 at 12:32

GdDGdD

11.5k33 gold badges3636 silver badges5050 bronze badges

answered Jul 4 at 12:32

GdDGdD

11.5k33 gold badges3636 silver badges5050 bronze badges