What did you do rocket wise today?

Discussion in 'The Watering Hole' started by BeerorKid, Jan 31, 2013.

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  1. Feb 17, 2020 #24,451

    Charles_McG

    Charles_McG

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    Yes, but wind so light that the sustainer landed between the pads and launch table negated the benefit.
     
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  2. Feb 17, 2020 #24,452

    crossfire

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    It was a great day at the Bong.
     
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  3. Feb 17, 2020 #24,453

    John Kemker

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    That's what Tommy Chong said...
     
  4. Feb 17, 2020 #24,454

    jeffjblack

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    Published yesterdays adventure:
    This rocket is rolled out of cardboard from cases of Michelob Ultra. 101mm in diameter, 127cm long, nearly 800 grams. This is an impressive mid power flyer on these Aerotech F67-4 and G79-4 motors. Join the fun!
    #ModelRocketry #MichelobUltra #Aerotech
     
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  5. Feb 17, 2020 #24,455

    prfesser

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    A little strange. The El-Cheapo brand (US Composites) laminating epoxy resin I bought at least 5 years ago is still just fine. It was stored at room temperature, which may make a difference. The slow curative is unchanged, and the resin itself works well with OLD (10-15 years) Fiberglast curative, at the same ratio as the can says.

    Best -- Terry
     
  6. Feb 17, 2020 #24,456

    rharshberger

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    Love my US Composites 635 and 150 epoxy resins, a gallon typically takes me 2-3 years to use, stored year around in an insulted garage so it sees about a 40-50°F temp swing.
     
  7. Feb 17, 2020 #24,457

    SeanW78

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    Awesome! Any chance you documented the process? I maaaaay be able to do something similar out of Miller Lite cases. If I start saving them now, I could have a flyer by, say, early March? :eggnog:
     
  8. Feb 18, 2020 #24,458

    Tobor

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    Nice. Did you fly solo at Bong? Never mind.
     
    Last edited: Feb 18, 2020
  9. Feb 18, 2020 #24,459

    Charles_McG

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    I have - but not this time.
     
  10. Feb 18, 2020 #24,460

    Speaknoevil

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    Injecting internal fillets on my Rocketman Miss Riley.
    P_20200218_100714_vHDR_Auto~2.jpg
     
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  11. Feb 18, 2020 #24,461

    jeffjblack

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    This covers most of it:
     
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  12. Feb 18, 2020 #24,462

    Charles_McG

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    So, I'm having fun this morning looking at the flight data v. the sim data.

    flight.png
    Red and blue lines are the acceleration and the velocity, red from sim, blue from the Proton.
    Green and purple lines are altitude, purple from sim, upper green from Proton baro, lower green from Proton accelerometer.

    The Velocity curves seem to match really well, considering the thrust difference.
    And I think the sim Altitude and Proton AltAccel would match nicely, if corrected for the thrust difference.
    But that flaky high baro altitude reading is a puzzler. I still think it's because my vented avbay pins are mucking up the airflow.
    The baro/accelerometer difference is -sort of- proportional to velocity.
    difference.png
    Well, actually the square of the velocity is a better fit. And I think that makes sense.
    (First 1.5sec of data, quadratic fit)
    fit.png
     
  13. Feb 18, 2020 #24,463

    mbeels

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    What was the thrust difference between the sim and actual? Do you know why the Proton velocity data has a discontinuity?
     
  14. Feb 18, 2020 #24,464

    Charles_McG

    Charles_McG

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    Simmed at 12G boost. Measured was just over 9G.
    -Edit-
    I figured out that my boosted dart sim had the weight wrong (from switching motors). The New sim is just over 11G boost. And I'm thinking that the weight is still wrong, because I used longer casing and spacers for both booster and sustainer. Which would bring the sim closer still.

    I don't pay -too- much attention to the discontinuities. In this case, the timing is at the stage separation event, so I assume the brief G spike put an offset the curve.
     
    Last edited: Feb 18, 2020
  15. Feb 18, 2020 #24,465

    Mick Kelly

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    Are you now using the compression foam for your core and skinning with 2 layers per side of carbon?
     
  16. Feb 18, 2020 #24,466

    Mick Kelly

    Mick Kelly

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    View attachment 406940
    For Sale: Madcow 5.5" Fiberglass Nike-Tomahawk kit.
    $550.00 Includes shipping in the CONUS only.
    If you live close enough for local pick up contact me for pricing.
    Independence, MO 64055
     
    Last edited: Feb 18, 2020
  17. Feb 18, 2020 #24,467

    kuririn

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    Mick, should be in the Yard Sale/Wanted forum.
     
  18. Feb 18, 2020 #24,468

    conman13

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    No compression foam involved! The cores are G10 fiberglass and they will be reinforced with carbon on each side. The purpose is to prevent de-lamination of the hand laminations during the high velocity flight.
     

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  19. Feb 18, 2020 #24,469

    Mick Kelly

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    Okay, Thanks
     
  20. Feb 18, 2020 #24,470

    us185damiani

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    Finished the paint on my 2 Cobra 1500’s
    Original style is in traditional yellow/White
    My up sized version is Copper/Red
     

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  21. Feb 18, 2020 #24,471

    kuririn

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    Wonder why the Cobra 1500 never took off and the Mean Machine did.
    Maybe the name and graphics?
     
  22. Feb 18, 2020 #24,472

    Jay Dub 4009

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    after lusting after a featherweight gps setup for awhile now, pulled the trigger and have a ship notice already!
     
  23. Feb 19, 2020 #24,473

    lakeroadster

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    Got rid of some pine... to make room for some lead...

    001.JPG
     
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  24. Feb 19, 2020 #24,474

    Greg Furtman

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    :(
     
  25. Feb 19, 2020 #24,475

    Greg Furtman

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    I applied Stickershock23 decals to my scratch built Arapahoe E. I then airbrushed on a couple of clear coats, Pledge Revive It Gloss Polish. It's an acrylic and works well with acrylic paints. It's ready to fly on the weekend. :)
     

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  26. Feb 19, 2020 #24,476

    dhbarr

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    Got some li'l fellers in.
    IMG_20200218_181509~2.jpg
     
  27. Feb 19, 2020 #24,477

    mbeels

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    Whoa, cool, 18mm EX? You'll have to post some details and results somewhere, those look neat!
     
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  28. Feb 19, 2020 #24,478

    SCooke123

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    I worked on the fillets on my Flutter-by and Goblin. Started on a Semroc Mark II
     
  29. Feb 19, 2020 #24,479

    SeanW78

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    I finally received the Pro38 hardware I ordered in December. 3G and 6G casings, 2 spacers and a delay trimmer. Bring on L1 and L2 certs and many, many flights.
     
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  30. Feb 19, 2020 #24,480

    Jay Dub 4009

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    Got the red on my iris along with first clear on the nose cone and grey on the upper payload. Learned a lesson I should have done that first and then done the roll pattern. I missed slightly taping it off and there is a small gap. I’ll have to do a touch up by hand IMG_3418.jpg
     
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