X1.4: A 24mm MD prototype story.

Discussion in 'High Power Rocketry (HPR)' started by Andrew_ASC, Aug 17, 2018.

  1. Sep 12, 2018 #241

    Andrew_ASC

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    Bought a three pack of Aerotech D-15T-7 for the RMS24-40. Figured 1,400ft may be enough to test deployment system before stepping it up to a G-145. Still mulling over whether or not I want to risk fins on an LPR motor. Also bought another CTI G-145. Looool. Apogee darn it get some more in stock!
     
    Last edited: Sep 12, 2018
  2. Sep 12, 2018 #242

    boatgeek

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    If you're concerned about fins staying on, you could make an extra-wide tape thrust ring so your D hangs out a ways and will hit first. You'll have to figure retention, but that shouldn't be awful.
     
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  3. Sep 12, 2018 #243

    Andrew_ASC

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    29D47578-55E3-4125-8A19-5615CC39922D.jpeg Thanks to EstesBasher. Cramming for exams and no time for rocket right now.
     
  4. Sep 12, 2018 #244

    OverTheTop

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    Gotta love matrices :)
     
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  5. Sep 13, 2018 #245

    Andrew_ASC

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    Filed intent to graduate.
     
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  6. Sep 13, 2018 #246

    Andrew_ASC

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    The chutes and more shock cord are predicted to arrive Friday. Motors shipped yesterday. Antenna shipped today.
     
  7. Sep 14, 2018 #247

    Andrew_ASC

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    78F7FFA4-11A6-42E5-8F60-286F36D91D4A.jpeg Chutes came in the mail today.
     
  8. Sep 14, 2018 #248

    Andrew_ASC

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    EB6A70ED-5B6B-4714-9648-4AF87BDDBA86.jpeg 210F932D-8567-403E-9C6F-C037C5538BE5.jpeg AFA1F0F6-7586-4FF2-8656-E31E9BC212E5.jpeg
    These top flight thin mill 12” chute fit wonderfully. And I was suprised that 10ft of #500 also fit.
     
  9. Sep 14, 2018 #249

    markkoelsch

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  10. Sep 14, 2018 #250

    Andrew_ASC

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    978B1C4A-3565-403A-B99B-FB3A9BBC5663.jpeg 9B5B86A1-81E7-4F78-B3E7-A402725739EF.jpeg I just retested it with the nomex and coupler from estesbasher and that fit also.
     
  11. Sep 14, 2018 #251

    timbucktoo

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    Hey Andrew are you flying that from a tower?
     
  12. Sep 14, 2018 #252

    Andrew_ASC

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    From a 1010 compatible FaRG.
     
  13. Sep 14, 2018 #253

    Andrew_ASC

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    64D38BC7-555D-4C48-8C2E-D703E6B1FF61.jpeg Epoxying cord to the coupler and tied two alpine butterfly knots.
     
  14. Sep 14, 2018 #254

    markkoelsch

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    A farg is ok, but a tower would really be the way to go for this.
     
  15. Sep 14, 2018 #255

    Andrew_ASC

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    I decided in favor of FARG for economy. It also works with everyone else’s 1010 rail wherever I go to launch this thing. Less equipment to pack. I’ve done towers before for multistage comps, this rocket is for fun lol.
     
  16. Sep 14, 2018 #256

    Andrew_ASC

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    Sara at Apogee says they have not tested these 24mm egglofter FARG with CTI G-145. ROFL. She called it a big motor oh my. That’s funny. Maybe I should look at alternate FARG?
     
  17. Sep 14, 2018 #257

    Andrew_ASC

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    960EEF0E-0947-40BA-97C3-7EE848AD0C98.jpeg Coupler tube epoxied into internally sanded airframe.
     
  18. Sep 15, 2018 #258

    timbucktoo

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    Can you still fit your nose cone in it? What about the G145?
     
  19. Sep 15, 2018 #259

    Andrew_ASC

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    G-145 fits fine I slid that in first. Tested everything before epoxy. I’ll report back in six hours or so. BSI epoxy still wet lol.
     
  20. Sep 15, 2018 #260

    Andrew_ASC

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    818A961E-3737-4419-BF72-759B338CC2D8.jpeg See it fits. Holy F*** it got tight with that coupler. I may need to use Estes wadding like Jim said. Trimming the second butterfly loop off.
     
  21. Sep 15, 2018 #261

    rharshberger

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    I still use Estes wadding, usually a single sheet as a "shot cup" to hold a ball of dog barf.
     
  22. Sep 15, 2018 #262

    Andrew_ASC

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    59459F9C-D822-4104-ABBE-F20A42E6AE26.jpeg Trimming off second butterfly loop did it. Man it really needs a good chute rolling.
     
  23. Sep 15, 2018 #263

    Eric

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    Are you going to wet sand the hole thing to a mirror gloss? What is your final weight, minus motor?
     
  24. Sep 15, 2018 #264

    Andrew_ASC

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    135 grams with chutes, shock cord, nomex, battery and Telemini. I plan to wetsand but not today.
     
    Last edited: Sep 15, 2018
  25. Sep 15, 2018 #265

    Andrew_ASC

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    7749C923-0DBB-4621-AF6A-D819E44D3CD2.png
    Spare G-145 reload in transit.
     
  26. Sep 16, 2018 #266

    OverTheTop

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    What's predicted accel on this? Might be worth applying some CA adhesive to hold the beeper and terminal blocks onto the PCB a little more solidly.
     
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  27. Sep 16, 2018 #267

    Andrew_ASC

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    93.27 G’s. Hence ditching the GPS and going to old school radio beacon. Motor eject.
     
  28. Sep 16, 2018 #268

    Andrew_ASC

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    649B19D4-45CB-4CF8-B1CD-949B6DE05434.jpeg I do worry about the dinky FARG under 77 pound force of thrust.
     
  29. Sep 16, 2018 #269

    Eric

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    And I would have those FARG's seated all the way against the fins. And they still might explode.
     
  30. Sep 16, 2018 #270

    Andrew_ASC

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    I stomped on one and it failed where the Elmer’s wood glue touched the outer beams on one outer beam. The wood didn’t split though: only a fail at a glue joint. Not all that confidence inspiring. This rocket might just need its own tower. Lol. Apogee wouldn’t give me a maximum motor they tested it with.​
     

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