Building the Estes Little Joe II: Tips, Tricks, and Modifications

Discussion in 'Low Power Rocketry (LPR)' started by James Duffy, Jan 28, 2016.

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  1. Apr 27, 2019 #301

    srfrich

    srfrich

    srfrich

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    If no progress on the stand yet, I contacted a small laser shop in San Diego (FLB Laser), and for a quantity of 6 or more, it would be $50 per stand, including materials (premium 1/4" Baltic Birch ply), sanding and cleaning of the finished cut pieces. Shipping and handling would be extra of course. But this may be a way to go forward on this. My question is, would this be an improper use of Daniel's file, if these stands are sold at cost?
     
  2. May 5, 2019 #302

    rocketguy101

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    I forwarded email addresses of folks who expressed interest in the stand to my friend at work that cut mine for me. He was going to experiment with different materials to see which would provide the best cut (the Luan he used for mine charred quite a bit, and some of the inner plies chipped out on the tiny crossbeams). He has been slammed at work with a hot project, and had some other laser home projects that had priority. He was going to get back on these, and is trying to figure out how to setup a payment system. I have been on vacation, and will check on progress this week.

    Meanwhile, I am posting the FB link to the original file, as I'm not comfortable re-posting the file itself here without the creator's permission... https://www.facebook.com/groups/2255560886/permalink/10154885315670887/
     
  3. May 29, 2019 #303

    srfrich

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  4. Jul 14, 2019 at 4:20 PM #304

    VonRecktofen

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    I built my kit stock with all of the helpful hints here, and it will fly this coming Saturday for the 50th Anniversary Apollo 11 launch...
    I'm planning on using a D-12-3 for a sort 300ft hop, where should the balance point be? My model weighs in at 7.60oz empty and 9.20oz with the motor....
    I used the 2 1/2 pats of clay in the nose tube, and the other 2 1/2 pats in the nosecone itself...
    Any suggestions would be appreciated!
     
  5. Jul 14, 2019 at 8:59 PM #305

    Mike Haberer

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    Read this thread to estimate it...https://www.rocketryforum.com/threads/cg-center-of-gravity.10546/

    My Rocksim places the CP at 16.7 inches from the top of the escape tower. A rocket width of 2.5 inches places the CG at about 14" from the top. That said, my rocket may be simming out differently because I overbuild the fin can and thus added BB's and epoxy to the escape tower vs. the clay pats (so mine is heavier). If you follow the instructions in the thread above you should be able to determine the CP and CG for your build. The only issue in figuring it out m=now is that if it's unstable, where do you add more weight?
     
  6. Jul 14, 2019 at 10:20 PM #306

    rocketguy101

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    The instructions clearly state where the balance point should be. Load it up like it will actually fly (motor, wadding, recovery, etc.) and check your balance point.
     

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  7. Jul 14, 2019 at 10:42 PM #307

    VonRecktofen

    VonRecktofen

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    That's interesting, my instruction sheet doesn't have that diagram that you posted....Hmmm, I wonder why?
    Thanks for posting your copy though!
     
  8. Jul 14, 2019 at 11:01 PM #308

    VonRecktofen

    VonRecktofen

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    Ah Ha! Found it! Very sneaky! It's an extra page, not folded together with the rest of the instructions!

    Thanks again for pointing this out!
     
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  9. Jul 14, 2019 at 11:26 PM #309

    rocketguy101

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    The printed set that came with my kit were in German!!! I had to download the English version from the Estes website :D
     
  10. Jul 14, 2019 at 11:38 PM #310

    kuririn

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    Instructions in most Estes kits now come in multiple languages. There should be an English/Spanish/French set in your kit in addition to the German/Italian(?) set. I usually cut out any templates, guides, and shock cord anchors from the set I'm not going to use before discarding it, so as to keep my English instruction set in one piece. (And to have backup template copies).
     

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