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  1. #31
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
    Posts
    2,306
    A 29mm coupler version would be nice too... I have an extra RW Mongoose 29 that's just waiting for something like this. The jury-rigged tracker NC sled that I did isn't nearly as nice as this one.


  2. #32
    Join Date
    22nd February 2013
    Location
    Garland, TX
    Posts
    3,136
    Quote Originally Posted by cerving View Post
    A 29mm coupler version would be nice too... I have an extra RW Mongoose 29 that's just waiting for something like this. The jury-rigged tracker NC sled that I did isn't nearly as nice as this one.
    What is the ID of the NC coupler on that one to xx.x mm accuracy?

    So much of my rocket building time has been diverted toward my "other hobby": Race Timing

  3. #33
    Join Date
    25th January 2009
    Location
    Glennville, GA
    Posts
    17,806
    Concur with 29mm version.
    -----------------------
    Chuck Haislip
    NAR/Tripoli Level 3
    Formerly a Prefect of ICBM - TRA #60

    Level 1 - LOC Minie Magg; Level 2 - PR Broken Arrow;
    Level 3 - 10 inch Nike Smoke
    2015 Ns for Year: 1315 Newtons
    My rockets usually fly naked. If they survive, they earn their paint.

    Come fly with ROSCo or ICBM in Camden SC => http://rocketrysouthcarolina.org

  4. #34
    Join Date
    22nd February 2013
    Location
    Garland, TX
    Posts
    3,136
    OK, so I think this is the 38mm version. I see making an adapter collar that could be put in 54 and 75 NCs to allow the same sled to be used. In these heavier cases the sled would have none of the NC load. The 29mm version will require a major redesign...in time.

    The 38mm kit would include 3 parts along with M4 set screws.

    1) Sled
    2) Aft "bulkhead"
    3) Drill Guide

    You would supply an eye bolt and (lock)nut (M6 pictured, but hole is meant for 1/4-20 as that is what the stock bulkhead is drilled for), and the kit parts of course.



    To assemble you use the drill guide to locate the holes that are drilled with a 1/8" bit. I recommend that you tap these holes for M4. With that the coupler is prepared.



    The attachment of the EF-mini is self explanatory, and the battery can be held in place with up to 3 zip ties. The sled includes a capture for a 1/4-20 nut (M6 shown here which is why it appears loose). The stock fiberglass bulkhead is then sandwiched between the aft "bulkhead" and the sled and screwed together with the bolt. The purpose for leaving the stock bulkhead in the system is to provide an extra stiff layer, and there by keep the printed parts "in compression" between the set screws and the fiberglass plate when the NC hits the end of the shock cord. The Eyebolt is also recessed into the "aft bulkhead" to save some space in the main recovery bay.



    When it is time to fly just plug in the battery, slide the sled sandwich into the NC and put in the set screws (making sure to get them deep enough that the NC coupler will slide freely in the body tube). I'm showing this one with the NC unglued for clarity, but it doesn't need to be that way.



    The entire NC with hardware, tracker and battery is 7 oz. I put 75 lbs of force on the eyebolt without any sign of damage upon disassembly...if you have more than a 150G shock at the end of your cord something went very wrong.

    Also, I received a suggestion to make these more visible than purple, so I have orange PETG in hand for producing these.

    Thoughts?
    Last edited by Cl(VII); 18th June 2017 at 02:12 AM.
    So much of my rocket building time has been diverted toward my "other hobby": Race Timing

  5. #35
    Join Date
    30th January 2016
    Location
    US > OK > NE
    Posts
    2,492
    Very cool! I can send you a 29mm GD NC to play with if that's useful :-)

  6. #36
    Join Date
    10th July 2007
    Location
    Melbourne, Australia
    Posts
    660
    Nice job
    TRA 13430, Level 3

    "Everybody's simulation model is guilty until proven innocent" (Thomas H. Lawrence 1994)

  7. #37
    Join Date
    15th July 2015
    Location
    Tidewater area of Virginia
    Posts
    1,354
    Awesome. I want 2.
    ATCS(AW) Tom Keith, USN, ret. _____NAR 99781 L1_____MDRA 212
    SEVRA, NAR 621http://www.sevra.org/ Tripoli East North Carolina (Bayboro), TRA #65, http://ncrockets.org/, MDRA http://www.mdrocketry.org/
    LVL 1 24 October 2015, Leviathan, CTI H133, 2469 ft, Bayboro
    LVL 2 Soon, Super DX3, AT J420 Redline, est 3500 ft, Bayboro or MDRA

  8. #38
    Join Date
    22nd February 2013
    Location
    Garland, TX
    Posts
    3,136
    Can anyone give me dimensions on the 38mm polycarbonate cone like the one Wildman sells?

    I need coupler ID, OD and depth from the aft end of the coupler to the NC inside tip.
    So much of my rocket building time has been diverted toward my "other hobby": Race Timing

  9. #39
    Join Date
    3rd December 2010
    Posts
    2
    Has anyone come up with a workable idea for a 3D printed sled/av-bay without needing all thread? I've been having thoughts about running a Kevlar line through, but I'm not sure that would be enough. Could save some weight (and RF interference for transmitters).

  10. #40
    Join Date
    10th July 2007
    Location
    Melbourne, Australia
    Posts
    660
    Done it with a slab of G10 inside a 3D printed NC (4")
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    Last edited by OverTheTop; 20th June 2017 at 07:33 AM.
    TRA 13430, Level 3

    "Everybody's simulation model is guilty until proven innocent" (Thomas H. Lawrence 1994)

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