Estes #1969 Saturn V: A cautionary tale

Discussion in '[Unrestricted] Staging, Airstarts & Clusters' started by ebruce1361, Jan 7, 2020.

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  1. Jan 24, 2020 #31

    ebruce1361

    ebruce1361

    ebruce1361

    The man with the plan. And some duct tape.

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    I managed to sim it in Openrocket decently well, but the design didn't include the fairings around the fins which increased drag in the tail because I couldn't figure out how to get the shape right. On top of that, I would run a flight simulation on a set of motors and get 850ft or more for predicted altitude, and then run the same configuration again and get less than 200ft. Half the time I had the CG showing up right on top of the motors and it wouldn't move even if I added a pound of weight to the nose.

    Ultimately, I did do the old reliable swing test and the rocket held up just fine. On top of that, it flew beautifully until the motor mixup caused the early deployment. So, even with it coming up to be heavier than my travel thermos full of six cups of coffee, (I know, a cup weighs about 8 ounces, but it definitely FEELS heavier) it was over stable and flew amazingly.
     
  2. Jan 25, 2020 #32

    DuaneW

    DuaneW

    DuaneW

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    Robert DeHate at AMW had a run of D11-Ps awhile ago. You might check there.
     
  3. Jan 25, 2020 #33

    Blast it Tom!

    Blast it Tom!

    Blast it Tom!

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    850 ft I could believe - straight up without drag I estimated 1950 ft - drag can really get you down! Does Open Rocket spit out the CdA or just the coefficent of drag? Even without fairings I'll bet it's pretty close.
     
  4. Jan 25, 2020 #34

    William Dieckmann

    William Dieckmann

    William Dieckmann

    Machinedr

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    Off subject
    Tom where in the burg
     
  5. Jan 25, 2020 #35

    Blast it Tom!

    Blast it Tom!

    Blast it Tom!

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    Right across the river from Ambridge. You?
     
  6. Jan 25, 2020 #36

    William Dieckmann

    William Dieckmann

    William Dieckmann

    Machinedr

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    Hi
    i built one where i use 12 volts for all
    put a 1K resistor in series with LED for continuity test then by pass this for blast off . one battery for all
    works great have launch key to kill all, arm switches which shows continuity, fire switch for launch
     
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  7. Jan 25, 2020 #37

    William Dieckmann

    William Dieckmann

    William Dieckmann

    Machinedr

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    i live in bentwood i fly at trax farms on first Sunday of the month should be starting up in April or May LOW power
    South Hills Area Rocketry Klub (SHARK) #809
    Contact:
    Gregory Moore
    3735 Grant St., Pittsburgh, PA 15234
    (412) 583-5438
     

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