Maxi Alpha 3

Discussion in 'Low Power Rocketry (LPR)' started by Cody Webster, Apr 23, 2016.

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  1. Apr 23, 2016 #1

    Cody Webster

    Cody Webster

    Cody Webster

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    Building a Maxi 3 with through the wall basswood fins. Going to require a bit of modding to make work, the plastic fins in the kit are warped pretty bad so I am not even going to mess with them.

    2016-04-23 16.19.58.jpg
     
    Last edited: Apr 23, 2016
  2. Apr 23, 2016 #2

    Cody Webster

    Cody Webster

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    2016-04-23 17.15.53.jpg
    Mocking up fin can. Gonna use estes 24mm motor retainer and no engine block to keep options open. I cut the fin slots out with scissors before gluing the can together. I went off of the plastic fin slots, this made lining everything up very easy. My fin edge utilizes the original fin slots in the top part of the can, I did however have to widen these slots some to allow the basswood fins to fit.
     
    Last edited: Apr 24, 2016
  3. Apr 24, 2016 #3

    Cody Webster

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    2016-04-23 18.18.37.jpg 2016-04-23 18.17.38.jpg
    I cut out the plastic so I can add the internal fillets to the fin can.
     
  4. Apr 24, 2016 #4

    Cody Webster

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  5. Apr 24, 2016 #5

    Cody Webster

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    2016-04-23 18.38.34.jpg
    Sanded and scored the coupling sides of the can ends so the glue will have something to really grip onto. This also takes some of the slop out of the coupling sides of the can ends. (There is very little but its there)
     
  6. Apr 24, 2016 #6

    Cody Webster

    Cody Webster

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    Attaching can ends and fins with 5 minute epoxy. Havent figured out the best method to attach the kevlar yet, this kit has an extra long motor tube that acts as a stuffer, thinking of running 2 kevlar cords, one on each side of the tube and epoxying them on.
     
    Last edited: Apr 24, 2016
  7. Apr 24, 2016 #7

    Cabernut

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    I was thinking about getting one of these.

    Staying tuned.
     
  8. Apr 24, 2016 #8

    Cody Webster

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    2016-04-24 00.15.43.jpg 2016-04-24 00.17.06.jpg
    Attached the fins with the double butt joint method (wood glue). Will add internal epoxy fillets tomorrow once the glue has cured. I feel this kit lends itself very well to through the wall mounting. Everything is coming along nicely and have figured out how I am going to attach my kevlar (will have kevlar attached with pics tomorrow). My only complaint so far is that the supplied coupling for the 2 main bt's is very short and I dont think I have a spare that is longer. I had not seen this kit in person before recieving this one, and it is a larger bird than I thought, and thats not a bad thing! :lol:
     
  9. Apr 24, 2016 #9

    Cody Webster

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    2016-04-24 00.27.21.jpg
    Dry fit next to a Leviathon build.
     
  10. Apr 24, 2016 #10

    Cody Webster

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    2016-04-24 12.51.55.jpg
    Motor mount and internal fillets applied. Before Installing the mount I sand and score the plastic as well as motor tube and all surfaces that make contact to ensure a strong bond. The plastic used for the estes motor mounts is made from a fairly slick material, I use an exacto and score the surface in an X pattern around the mating surfaces. I used 30 minute epoxy so I had enough time to get all the internal fillets applied.
     
  11. Apr 24, 2016 #11

    Cody Webster

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    2016-04-24 13.21.44.jpg 2016-04-24 13.38.43.jpg 2016-04-24 13.40.41.jpg
    I went a different route with the kevlar than I was thinking last night, I feel this way of attaching the kevlar is going to be more than strong enough. I am using 300# kevlar on this project. First I tied my kevlar around the body tube, after scoring mating surfaces I applied 5 min epoxy and assembled. I used the bottom centering ring with the notch on the top, the notch makes a place for the knot to sit in and cover the knot in epoxy so it wont unravel. I used the top centering ring (green) on the bottom seeing as I didnt use the standard metal motor retainer so switching the rings around worked out great. I then applied the a little more epoxy above the notched ring and applied the unused engine hook retainer ring for added security and strength.
     
    Last edited: Apr 24, 2016
  12. Apr 24, 2016 #12

    KenRico

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    Looks good ! Like the HPR techniques used in the build - with a FG wrap you could probably use it to fly Level 1 motors

    Kenny
     
  13. Apr 24, 2016 #13

    Cody Webster

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    Thanks for the compliments, this has been a really fun build, I havent been able to stop since I opened it. This could have went in the Mpr section, however my intentions for this build is to have a nice big slow low flyer for monthly club meet. Our alt limit for our lpr sight is 1000 ft, and I wanted to build this kit specificly for that launch, however wanted to have the option to let her rip at our higher power launch sites.
     
    Last edited: Apr 24, 2016
  14. Apr 24, 2016 #14

    Cody Webster

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    2016-04-24 14.13.27.jpg
    Weighing in at 92.2 grams with no motor. This seams a little high to me but it really doesnt feel heavy in hand.
     
    Last edited: Apr 24, 2016
  15. Apr 25, 2016 #15

    Cody Webster

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    2016-04-24 17.58.23.jpg
    Nearing final stages of construction. I applied thin Ca to the inside of the motor tube and finished the stuffer portion of the motor tube, as with most of this build I epoxied the top centering ring in place.
     
  16. Jul 1, 2017 #16

    MarcoPolo

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    What did the finished rocket look like? How did it fly?
     
  17. Sep 30, 2018 #17

    Cody Webster

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    Sorry Marco I took a break from rockets and got back into rc a while, however Iv got out of rc and back into rockets. Will post more pics as I get started back on this build in the next few weeks.
     
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  18. Oct 13, 2018 #18

    Cody Webster

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    2018-10-12 20.42.33.jpg Body tubes glued together. The supplied coupler is pretty short, but I dont forsee that being any issue on this build.
    2018-10-12 20.45.25.jpg
    Got some motors for this and some other builds.
    2018-10-12 20.49.08.jpg Have some minor spots to fill and fix on her. With the motor can and fins being built as strong as they are, I dont know if Im going to do much for fillets. It wont need them for strength. I was also planning on leaving the fin edges squared as I want to be able to fly this rocket in smallish areas and not push her too high. Standard launch lugs to boot and this should be a fun rocket at lpr limited launches.
     
    Last edited: Oct 13, 2018
  19. Oct 14, 2018 #19

    Cody Webster

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    Getting some body work done. The transitions between the bt and plastic fin structures were pretty rough. I hit them with some 220 to get them smoothed out, followed by some squadron green putty. I have used this putty on rockets in the past with great results. Once dry I will sand them smooth. 2018-10-14 00.14.24.jpg
     
  20. Oct 14, 2018 #20

    Cody Webster

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    The putty worked great, and sanded very well as usual. The body still needs some work but the putty will create a solid foundation the the cwf and filler primer to follow. 2018-10-14 14.49.33.jpg
     
  21. Oct 14, 2018 #21

    crossfire

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    I think I would do some small fillets.
     
  22. Oct 14, 2018 #22

    Cody Webster

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    The people have spoke! Small fillets it is, I think I will probably do 3 or 4 layers ofwood glue for the fillets and call it good. Gooing to need to get a good layer of primer down after the fillets and start sanding. As cool as a rocket as this is, because of the modifications made it is going to require some extra body work to lookup to my standards. I have my lugs epoxied on, I like to cut and peel the layer of bt where the lugs are placed exposing the bare cardboard, as well as roughing up and scoring the contact surface of the launch lug. 2018-10-14 15.22.01.jpg
     
  23. Oct 14, 2018 #23

    Cody Webster

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    2018-10-14 15.34.49.jpg
     

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