LOC 4" Black Brant X L1 Cert Build

Discussion in 'High Power Rocketry (HPR)' started by PeterP, Feb 21, 2019.

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  1. Mar 16, 2019 #61

    PeterP

    PeterP

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    Awesome, hope to see you there. One of our SEDS members, who’s an L3, is coming up with me and he oversaw my simulation and critiqued my build. I do plan on triple checking all recovery points and maybe even doing a deployment test. I did neglect to post recovery pictures on this build thread, sorry about that. Actually, I feel like I neglected to post a lot of the build process.

    Essentially: I have a looped end shockcord attached to an eyebolt at top of baffle system and then a nomex blanket on the shock cord. The other end of the shockcord is attached to a quick link with the parachute also on the quick link. All of that is connected to a forward bulkplate with eyebolt in payload bay.

    I did mark my CP with tape and my calcluated CG gives me about 2.7 stability Margin. I will mark an official CG at launch.

    Good to know my flight will be in sight throughout. A 50” chute is bringing me down at about 15mph on a 7 pound rocket.

    Appreciate the tips! I’m thankful I have experienced people coming with me and at the launch. Looking forward to learning and meeting people.
     
  2. Mar 16, 2019 #62

    GalantVR41062

    GalantVR41062

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    Good luck with the L1 attempt. Good to hear you have been in contact with some other rocketeers, it's a learning process not a destination. Pics, video, stats if you think of it all.

    ~John
     
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  3. Mar 16, 2019 #63

    PeterP

    PeterP

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    Thanks! I definitely agree that learning is the best part. I knew nothing about rocketry 9 months ago. Will try my best to get as much media I can! If you are there, come say hello.
     
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  4. Mar 17, 2019 #64

    Andrew_ASC

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    Welcome to high power! Given the winds today you had an awesome flight man.
     
  5. Mar 17, 2019 #65

    PeterP

    PeterP

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    Thanks! Glad you were able to witness it in person. I will be posting a full flight review hopefully tomorrow.
     
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  6. Mar 17, 2019 #66

    Nytrunner

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    I'll add congratulations also! Good looking rocket you had out there today

    I regret I didin't have time to introduce myself in person, I got distracted pulling Big SAM out of the neighborhood and catching up with Ryan B
     
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  7. Mar 17, 2019 #67

    gtg738w

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    Congrats!
     
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  8. Mar 17, 2019 #68

    PeterP

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    As some of you may have already seen, I received my L1 certification yesterday! Now, story time:

    Woke up before the sun rose just to get a head start on the way to Elizabethton, KY. I was lucky enough to have a few friends from SEDS (one who has his L3 and one who also earned his L1 with me) and some family members. Once we got there and started getting ready, I decided an ejection test would be wise to make sure 1.4 grams of BP was enough for the long tubes and baffle system. Chris Short was very helpful and I was able to purchase everything I needed. I was also able to borrow a spent DMS case to hold the BP from fellow flyers. During the ejection test, everything came out great and I decided the standard charge that comes with the I280 would be enough.
    93CDFC49-0364-40D8-81C3-7D5A14136B7D.png

    Now I was getting excited. I repacked my recovery system and went to work on installing the motor and drilling delay for 10 seconds. Nathan K. was kind enough to let me borrow his Jolly Logic Altimeter 3 to get some data from my flight. Was able to zip tie it to the nose cone and let it be.
    Once everything was flight ready, Nathan and I walked up to the RSO for pre flight inspection. Everything was cleared and I was starting to draw a crowd. We had to wait a few minutes for the pads to be clear and the wind to die down, so took the opportunity for a photo.
    D3B20E58-FA00-4C4D-868A-A804170C609B.jpeg

    After we got the rocket on the rails, igniter installed, and ran back up the hill to the flight line, remembered I totally forgot to plug the power cord back into the box. So I ran all the way back down and up the hill to plug it back in. After I was entirely out of breath, a crowd watching, and cameras raised, the RSO was kind enough to let me announce the launch and press the ignition.
    8CD5272F-FFE8-42FD-8149-EC4CD1ECFDB1.png

    The launch went off without a hitch. It was quite windy, but the rocket went straight up. Man that dark matter is a pretty propellant! The 10 second delay was perfect and popped right at apogee. Rocket started coasting towards a near by field, but we had eyes on it the whole way down.
    A23F69BF-D336-4344-BBB4-0D17D4A1A8EB.jpeg

    Rocket landed probably .25 ish miles away in a creek. Parachute was covered in water and the top part of the rocket was a little wet. Thankfully Nathan's altimeter was dry. Also, there was a pond probably 20 feet away that I missed by a thread. Everything looked in tact and Nathan gave me the all clear and said I had earned my L1!
    A32909D4-635E-4F2F-846C-007E79593449.jpeg 54DC3277-EF9A-46BC-A0C2-4086CE37A973.jpeg 2FFC1DA7-89DC-4767-9CC2-25E8B40F22C8.jpeg

    After later inspection, the parts that got wet will be fine and I should be able to get another flight and hopefully use this as my L2 bird. I have no doubt this could handle a J or even a K. Also, turns out the altimeter software was not updated to the latest software, so it failed to record any data. However, I would assume the simulation was right on at 2400 feet.

    To conclude this journey, I just want to say thank you to everyone that helped me during this process. I learned alot and I truly did appreciate all the input and support throughout. L2 will be next ;)
     
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  9. Mar 17, 2019 #69

    Nytrunner

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    Great photos!

    Will you refly on a J/K or reach for a new challenge for L2?
     
  10. Mar 17, 2019 #70

    PeterP

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    Thanks! I will most likely take the exam, and just put a J250 or something like that in it and call it a day. That would be the most cost effective and it could handle it. On the other extreme, I have a friend that is offering to sell me a Go devil 54 for cheap. I do know that my next build will most likely be fiberglass just for the durability/peace of mind.
     
  11. Mar 17, 2019 #71

    PeterP

    PeterP

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    Also I am happy to report that I stayed relatively close to my budget! As some of you may remember, I set aside $300 out the door cost for my L1 certification. Here is what my bill looks like:

    NAR Membership- $25.00
    LOC BBX Kit- $140.55
    Nomex Blanket- $12.39
    BSI Epoxy- $22.93
    38mm Adaptor- $15.94
    Paint- $16.16
    I280DM Motor- $69.99
    DAT Tool- $9.99
    BP- $25.00
    Igniters- $2.00

    Total- $339.95

    I think that is pretty dang close to the budget and if you account for the items that I can reuse and if I choose to use this kit for my L2, that makes everything even better.
     
  12. Mar 17, 2019 #72

    Nytrunner

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    NAR, epoxy, DAT, adapter, all of those are distributable costs, so you're under budget in my book!

    Ah, the J270. Faithful baby J motor. Well, you know your rocket can take it!

    My challenge question for ya: If you go that route for your L2 and get your card, what will you have learned? :cool:

    Keep flying and good luck!
     
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  13. Mar 17, 2019 #73

    Glasspack

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    Congratulations... that model is beautiful !!

    I know all to well what that must have felt like seeing it so close to the water.

    I had to fish one of the flights of my SA-14 Archer out of a pond ! Followed by cutting a hole in the body to get the trapped water out.
     
  14. Mar 18, 2019 #74

    PeterP

    PeterP

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    Very true. Getting into electronics and dual deployment is definitely something that is on my to do list and something that is almost necessary for L3. I will have to weigh the pro's and con's when that time comes.
    Thanks! A simple wind gust is what stood between me and that scenario (yikes). Thankfully the little bit of mud scraped off and the softened tubes dried back up. If it really is a concern, I can reinforce the trouble spots. Parachute has been hanging in the shower to dry
     
  15. May 29, 2019 #75

    Pretzelcuatl

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    Congratulations on your flight. I'm about to build the same model and your story is helpful. I see you chose to build the fin assembly and cut into the body tube to get the fins in. I'm inclined to do the same.
     
  16. May 29, 2019 #76

    PeterP

    PeterP

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    I appreciate it! This is a great kit and definitely stands out amongst a crowd. My decision to slide the whole MMT and fins into the airframe as one unit was actually stemmed from the instructions LOC provided. It allows for a stronger bond and internal fillets. The only downside is the body tube can warp a little. I fixed that by attaching clamps while waiting for epoxy to cure (pictured). Best of luck on your build!
     

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