"Starship" - L3 Build Thread

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

Help Support The Rocketry Forum by donating:

  1. Apr 11, 2019 #91

    Nytrunner

    Nytrunner

    Nytrunner

    Master of Rivets

    Joined:
    Oct 15, 2016
    Messages:
    4,366
    Likes Received:
    775
    Gender:
    Male
    Location:
    Huntsville AL
    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"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    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"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    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
     
    Tim51 likes this.
  4. Apr 16, 2019 #94

    Bat-mite

    Bat-mite

    Bat-mite

    Rocketeer in MD

    Joined:
    Dec 5, 2013
    Messages:
    9,637
    Likes Received:
    807
    Gender:
    Male
    Location:
    Maryland
    Looking good!
     
    Ben Martin likes this.
  5. Apr 17, 2019 #95

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    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

    Steve Shannon

    Well-Known Member

    Joined:
    Jul 23, 2011
    Messages:
    4,818
    Likes Received:
    1,115
    Location:
    Butte, Montana
    One thing you should do is to twist each of those red-black pairs of wires to reject interference.
     
    pondman and Ben Martin like this.
  7. Apr 17, 2019 #97

    jqavins

    jqavins

    jqavins

    Joseph Avins

    Joined:
    Sep 29, 2011
    Messages:
    1,613
    Likes Received:
    260
    Gender:
    Male
    Location:
    Bath, NY
    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

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    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 #99

    Lukun7

    Lukun7

    Lukun7

    Active Member

    Joined:
    Apr 16, 2019
    Messages:
    43
    Likes Received:
    5
    Gender:
    Male
    Location:
    The Woodlands, Texas (Near Houston)
    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 #100

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    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 #101

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    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
     
    Steve Shannon likes this.
  12. Apr 21, 2019 #102

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    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.
     
  13. Apr 27, 2019 #103

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    I picked up some Duracell Quantum batteries for the altimeters. I assume these are built the same as the normally Duracell? Have any of you used them?
     
  14. Apr 29, 2019 #104

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    Update #20:

    It's been a bit...

    Picture #1: Installed batteries. The fit is incredible, very impressed by this sled. I tested the altimeters to make sure my soldering job works, they powered on and did the normal beeps so it is all looking good.

    Picture #2: Sealing connections through the bulkhead with tack, I plan on epoxying the ubolt on and sealing around the ejection charge holders. This should ensure that the vent holes are the only openings.

    I will post pictures of the sealing method I am using for the 1/4in rods tomorrow. It involves a neoprene washer, stainless washer, lock washer, and a normal stainless nut. 20190428_225258.jpeg 20190428_225333.jpeg
     
    jd2cylman likes this.
  15. Apr 29, 2019 #105

    Banzai88

    Banzai88

    Banzai88

    Lvl 1,Wallet....Destroyed

    Joined:
    Jul 15, 2015
    Messages:
    1,932
    Likes Received:
    217
    If you're that worried about ejection gas blow through, a little dab of RTV would be much more effective long term. I see most folks just put a dab of 5 min epoxy to keep any hardware from backing out, which seals, too. Either way, not ever seen any issues from simple screw holes.
     
  16. Apr 29, 2019 #106

    Dave A

    Dave A

    Dave A

    Lifetime Supporter TRF Lifetime Supporter

    Joined:
    Jan 22, 2013
    Messages:
    1,081
    Likes Received:
    80
    Use them all the time. After a weekend, they still have 9.2 volts.
     
    Ben Martin likes this.
  17. Apr 29, 2019 #107

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    Yeah I'm probably being a bit over cautious. I'll probably just end up epoxying them as you mentioned when I'm sealing the rest of it.
     
  18. Apr 29, 2019 #108

    boatgeek

    boatgeek

    boatgeek

    Well-Known Member

    Joined:
    Dec 27, 2014
    Messages:
    1,749
    Likes Received:
    367
    Do you have anything planned to keep the batteries from sliding to the right as shown in your pictures?
     
  19. Apr 29, 2019 #109

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    Yes, there are covers that screw on. Just noticed I don't have a photo of them installed so I'll make sure to include one during the next update. The batteries are very secure with the covers on. Battery_Cover_Standard_large.jpeg
     
    boatgeek likes this.
  20. May 2, 2019 #110

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    Sealing the 1/4in rods with a neoprene washer, stainless washer, stainless lock washer, and stainless nut. Provides a very secure connection and seals the hole. 20190502_034939.jpeg
     
  21. May 12, 2019 #111

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    Update #21:

    Changed the parachute combination to an 9ft and 2ft Rocketman Standard Parachute.

    Photo #1: Drilled and tapped 6 holes for 2-56 shear pins. I bought a pack of 100 2-56 nylon screws from Amazon for only $4. (https://www.amazon.com/dp/B00137KXGA/ref=cm_sw_r_cp_apa_i_blj2CbASDKP9H)

    Photo #2: Close up of the tapped threads. Used tap and t-handle from Amazon.

    Tap: https://www.amazon.com/dp/B00N3ZJNIE/ref=cm_sw_r_cp_apa_i_umj2CbD123TJD

    T-handle: https://www.amazon.com/dp/B0002YUVSA/ref=cm_sw_r_cp_apa_i_5mj2Cb0SQG60E

    I will be ordering the parachutes and shock cord within the next week. Calling around to local stores to see if they have FFFFG black powder for ejection charges, heard it can be hard to find. After that, only thing left to do is ground testing then maiden flight! Looking forward to it. 20190511_005624.jpeg 20190511_033515.jpeg
     
  22. May 13, 2019 #112

    Nytrunner

    Nytrunner

    Nytrunner

    Master of Rivets

    Joined:
    Oct 15, 2016
    Messages:
    4,366
    Likes Received:
    775
    Gender:
    Male
    Location:
    Huntsville AL
    Try Bass Pro shops. May have to call a store specifically to inquire, their website is not overly helpful in determining where it is in stock since they won't sell online.
     
    Ben Martin likes this.
  23. May 13, 2019 #113

    Banzai88

    Banzai88

    Banzai88

    Lvl 1,Wallet....Destroyed

    Joined:
    Jul 15, 2015
    Messages:
    1,932
    Likes Received:
    217
    Usually smaller, independant gun shops that cater to the muzzleloader crowd are going to have BP. NONE of the corporate box stores in 250 miles of my area (Tidewater VA) carry it.
     
  24. May 15, 2019 #114

    blackjack2564

    blackjack2564

    blackjack2564

    Crazy Jim's Gone Banana's

    Joined:
    Jan 18, 2009
    Messages:
    8,711
    Likes Received:
    813
    Location:
    Savannah Ga
    Chris Short and ken Allan both have 4f if you ever fly where they vend.
     
  25. May 18, 2019 #115

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    I plan on using the threaded rod in the nosecone for adjustable noseweight but this would impact the T3 GPS tracking system. Some ideas I had were externally mounting the antenna through the nosecone bulkhead, using fiberglass threaded rod, or mounting the T3 on the shock cord but I'm not sure which one would be the best option. What are your opinions on these options?
     
  26. May 18, 2019 #116

    Tobor

    Tobor

    Tobor

    Get your peanuts....

    Joined:
    Oct 8, 2016
    Messages:
    1,041
    Likes Received:
    130
    One option would be Nylon Threaded Rod.
    Links to this stuff
    Grainger (Link)
    US Plastics (Link)
    MSC Industrial (Link)
     
  27. May 18, 2019 #117

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    I wouldn't rely on the nylon threaded rod for all the force but I could epoxy it into the tip so that I can just screw weight onto it. I would have to secure the nosecone bulkhead to a plate inside the shoulder, possibly a 3D printed one.
     
  28. May 18, 2019 #118

    Banzai88

    Banzai88

    Banzai88

    Lvl 1,Wallet....Destroyed

    Joined:
    Jul 15, 2015
    Messages:
    1,932
    Likes Received:
    217
    Get a MAC or APE nose cone bay. Both problems solved.
     
  29. May 18, 2019 #119

    Ben Martin

    Ben Martin

    Ben Martin

    "That guy in the hall building a rocket"

    Joined:
    Sep 29, 2018
    Messages:
    608
    Likes Received:
    165
    Gender:
    Male
    Location:
    Houston
    Seems like they are designed for plastic nosecone and do not allow for easily changeable noseweight. It also requires for the top rings to be on the lip between the shoulder and the nosecone, which I already epoxied on. I personally think that it would be easier to use a nylon/fiberglass threaded rod and a ring for the bulkhead to be screwed into. That way the force is not only on the threaded rod, removing a lot of the concern.
     
  30. May 19, 2019 #120

    Tobor

    Tobor

    Tobor

    Get your peanuts....

    Joined:
    Oct 8, 2016
    Messages:
    1,041
    Likes Received:
    130
    Not being argumentative here but nylon bolts are a lot stronger then most people realize. Ask any R/C pilot. I have seen nylon bolts used to hold down wings of 1/4~1/3 scale aerobatic planes like the Cap 21 and Christian Eagle.
     

Share This Page