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  • Atmosphere at time of Falcon separation

    From JF Mezei@21:1/5 to All on Sun Jun 6 21:51:42 2021
    Sanity check:

    At time of first stage separation for Falcon 9 and lighting of stage 2,
    we can see the foil "blanket" that is higher up from the engine bell on
    stage 2 move.

    Is this movement due to wind at that altitude/speed (about 100km) or
    just the blanket moving due to ship accelerating?

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  • From Sylvia Else@21:1/5 to JF Mezei on Mon Jun 7 12:48:09 2021
    On 07-Jun-21 11:51 am, JF Mezei wrote:
    Sanity check:

    At time of first stage separation for Falcon 9 and lighting of stage 2,
    we can see the foil "blanket" that is higher up from the engine bell on
    stage 2 move.

    Is this movement due to wind at that altitude/speed (about 100km) or
    just the blanket moving due to ship accelerating?



    Effect of changing acceleration (as the fuel is depleted) in combination
    with vibration.

    Sylvia.

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Snidely@21:1/5 to All on Mon Jun 7 03:55:46 2021
    on 6/6/2021, Sylvia Else supposed :
    On 07-Jun-21 11:51 am, JF Mezei wrote:
    Sanity check:

    At time of first stage separation for Falcon 9 and lighting of stage 2,
    we can see the foil "blanket" that is higher up from the engine bell on
    stage 2 move.

    Is this movement due to wind at that altitude/speed (about 100km) or
    just the blanket moving due to ship accelerating?



    Effect of changing acceleration (as the fuel is depleted) in combination with vibration.

    I figured it was a side effect of pressurizing the feed lines.

    Does that engine gimbal or do they depend only on thrusters for 2nd
    stage guidance?

    /dps

    --
    "That’s where I end with this kind of conversation: Language is
    crucial, and yet not the answer."
    Jonathan Rosa, sociocultural and linguistic anthropologist,
    Stanford.,2020

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  • From Snidely@21:1/5 to After serious thinking Snidely on Sun Jul 4 01:39:55 2021
    After serious thinking Snidely wrote :
    on 6/6/2021, Sylvia Else supposed :
    On 07-Jun-21 11:51 am, JF Mezei wrote:
    Sanity check:

    At time of first stage separation for Falcon 9 and lighting of stage 2,
    we can see the foil "blanket" that is higher up from the engine bell on
    stage 2 move.

    Is this movement due to wind at that altitude/speed (about 100km) or
    just the blanket moving due to ship accelerating?



    Effect of changing acceleration (as the fuel is depleted) in combination
    with vibration.

    I figured it was a side effect of pressurizing the feed lines.

    Does that engine gimbal or do they depend only on thrusters for 2nd stage guidance?

    Pre-launch, the 2nd stage did an engine wiggle test, so I guess it
    gimbals.

    /dps

    --
    "First thing in the morning, before I have coffee, I read the obits, If
    I'm not in it, I'll have breakfast." -- Carl Reiner, to CBS News in
    2015.

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