"Starship" - L3 Build Thread

Discussion in 'High Power Rocketry (HPR)' started by Ben Martin, Mar 4, 2019.

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  1. Apr 11, 2019 #91

    Nytrunner

    Nytrunner

    Nytrunner

    Master of Rivets

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    Ask around your club or school team.

    Worst case scenario, get familiar with the manual programming feature.
     
  2. Apr 11, 2019 #92

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

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    Yeah I don't think it should be too big of a deal. Just looking forward to finally receiving them and setting up the electronics bay. One step closer to launch.
     
  3. Apr 16, 2019 #93

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

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    Update #17:

    Received the 2 Stratologger CFs and battery clips that I ordered last week.

    Photo #1: Test fit all of the bulkhead hardware. Tomorrow I will be epoxying the ubolt and charge holders to seal and secure them.

    Photo #2: Back view of the bulkhead. Shows the through bulkhead terminals and the ubolt backplate.

    Photo #3: Soldered JST connectors to the switches. There is not a polarity to my knowledge when it comes to screwing it into the altimeter terminals. If there is, please let me know.

    Photo #4: Temporary mounting of Stratologger CFs. Once I start wiring the electronics bay I will clean it all up with padded zipties instead of hastily applied tape. I may consider moving the Stratologgers closer to the center of the sled but it would make wiring a bit tight.

    Photo #5: View of the entire electronics bay. I will be working on the wiring tomorrow. I plan on hooking up the ejection charge wires and battery connectors.

    Photo #6: Bulkheads and sled attached to coupler. They fit very nicely, I'm happy with how they turned out thus far.

    Looking forward to working more on the wiring tomorrow in addition to epoxying the threaded rod into the nosecone and securing the bulkhead hardware. Progress is being made! 20190415_225602.jpeg 20190415_225613.jpeg 20190415_225712.jpeg 20190415_235039.jpeg 20190415_235230.jpeg 20190415_235436.jpeg
     
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  4. Apr 16, 2019 #94

    Bat-mite

    Bat-mite

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    Looking good!
     
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  5. Apr 17, 2019 #95

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

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    Update #18:

    Worked on wiring the electronics bay.

    Photo #1: Overhead view of the electronics sled, bulkheads, and the coupler.

    Photo #2: Side view

    Photo #3: Close up of the sled.

    Photo #4: View from the other side. Shows the bulkhead and the wiring.

    Now that I have everything connected I will be cleaning up the electronics bay and securing the bulkhead hardware. I was able to purchase the USB transfer cord for the Stratologgers so the electronics bay should be correctly configured soon. 20190416_224108.jpeg 20190416_224123.jpeg 20190416_224132.jpeg 20190416_224152.jpeg
     
  6. Apr 17, 2019 #96

    Steve Shannon

    Steve Shannon

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    One thing you should do is to twist each of those red-black pairs of wires to reject interference.
     
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  7. Apr 17, 2019 #97

    jqavins

    jqavins

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    It's also good practice to keep wires short. Not tight, but short enough to avoid unnecessarily large loops, though long enough to allow (only a little) movement. And try to designate wire pathways, as if they are running in imaginary pieces of conduit. I realize that runs counter to keeping them short, but you find a compromise. In other words, keep it neat. That leads to multiple pairs running together over some of their length*, and you can use those areas to apply tie-downs.

    And now the other side of the coin. I did write "unnecessarily large loops." Now and then, a large loop is necessary, and so be it. How do you plan to put the while assembly into the coupler? Since there are wires fixed to both bulkheads, you need to be able to break one of them away, and put it back together with the bulkheads prepositioned, which means you need access to a connector in between. The connector just to the left of the sled in the first picture looks like it would be really hard if not impossible to reach in that situation. Maybe you've got this covered; maybe I'm full of hot air. If not, then it looks to me like you need more length between the sled and that connector to allow for final assembly. Less length between the connector and the bulkhead could go along, but no matter what it will need more slack than the other wires in the setup. (If it were me, I'd make that last connection accessible through a hatch in the side of the rocket, but I do tend to overthink things.)

    * Some may observe that running wires parallel like this increases interference/cross talk. True, but simply using twisted pairs will be sufficient mitigation, since none of these wires are carrying low level signals.
     
  8. Apr 17, 2019 #98

    Ben Martin

    Ben Martin

    Ben Martin

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    I wish that I could center the sled more but I can't due to the switch placement. I'm going to work on cleaning up the wiring and twisting the wires. I plan on sliding the sled with the left bulkhead on first then putting on the right bulkhead due to the connections being closer.
     
  9. Apr 20, 2019 at 5:02 PM #99

    Lukun7

    Lukun7

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    I apologize for not asking earlier, but how did you install the MMT without the aft CR on and still have it become straight enough?
     
  10. Apr 20, 2019 at 5:59 PM #100

    Ben Martin

    Ben Martin

    Ben Martin

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    I epoxied the front centering rings into the body tube using the rear centering ring and retainer (not epoxied) to align it. 20190307_173154.jpeg
     
  11. Apr 21, 2019 at 5:01 AM #101

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

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    Update #19:

    Photo #1: Drilled 4 vent holes in the coupler. Turns out that the switch mounts are not perfect on the sled so I'll have to make some modification.

    Photo #2: Organized the electronics sled, twisting and tying down the wires. 20190420_213839.jpeg 20190420_214021.jpeg
     
  12. Apr 21, 2019 at 7:07 AM #102

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

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    After fiddling around with it, I found two holes that align with the switches perfectly. I'm picking up some Duracell 9V soon to begin testing. Only thing left to do is to order the recovery system and get to testing.
     

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