Mach 1 Exiter Build Thread

Discussion in 'Low Power Rocketry (LPR)' started by NateB, Nov 10, 2018.

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  1. Nov 10, 2018 #1

    NateB

    NateB

    NateB

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    Since Mach 1 Rocketry first listed kits for preordering, I was very interested in his line of fiberglass low power rockets. I like working with fiberglass better than cardboard, and it also hold up to my curious 3 year old better than any Estes kit. Now, we have a line of fiberglass kits we can fly in the park on cheap BP motors.

    I bought a few kits this Spring when they were first offered and a few more during his Haloweeen / Black Friday Sale. First up, is the Mach 1 Exiter, a minimum diameter 3 Fin and a nosecone kit. Open Rocket shows it flying about 230ft on an A motor up to 2000 ft on a D. Sounds perfect for us.

    Step 1 is always to give the fiberglass parts a good bath.

    [​IMG]

    After the parts were washed, rinsed, and dry, I put them on the scale. 31g before any recovery. The kit includes a black printed streamer with the Mach 1 logo. I might use it, or I might use something more reflective if I end up sending it higher.

    [​IMG]

    Now the body tube was marked for the fin and rail button locations. The kit includes micro sized rail buttons for the Makerbeam rail or a launch lug. I like the appearance of buttons better than a launch lug. I don't see building a tower or fly away guides for a park flyer being worth the effort.

    [​IMG]

    Next steps, epoxy the thrust ring in place, rough of the area on the body tube for the fin roots and fillets, epoxy the fins in place. I think it will take longer to talk about this rocket than it will to build it.
     
  2. Nov 10, 2018 #2

    NateB

    NateB

    NateB

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    The area on the inside of the body tube for the thrust ring was scuffed up with 60 grit sandpaper along with the outside of the thrust ring. The thrust ring was then glued into place with epoxy. I also glued the bulkhead to the nosecone since I had some epoxy mixed up. Once this has cured for a few hours, I'll attach the fins.
     
  3. Nov 11, 2018 #3

    NateB

    NateB

    NateB

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    Each fin root and edge where the fillets will be were sanded with 60 grit sandpaper. Same with the body tube. I also drilled small holes for the rail buttons. The screw for holding the lower guide will be trimmed and sanded flush with the body tube so it doesn't impede insertion of the motor. The upper guide was drilled through the thrust ring. It will get trimmed down so it doesn't melt too much from the ejection charge.

    Using the Estes fin guide with the thin G10 fins was helpful as a set of third hands, but still requires patience to keep everything straight. There is not much to attach the fin roots to the body tube. I think most of the strength will come from the fillets. I'm going to use Rocketpoxy for the fillets, but I'm not sure yet what tool I will use to pull them for the proper radius.

    PSX_20181110_224207.jpg
     
    Last edited: Nov 11, 2018
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  4. Nov 24, 2018 #4

    NateB

    NateB

    NateB

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    I have not abandoned or forgotten about this build, I have been busy with work, mandatory education and another project our director put me on with a small group.

    This is my weekend off and I was able to get filets laid down and smoothed on each fin. It took a while to find the right tool to pull the Rocketpoxy. I was at a Meijer store and found a pack of "craft picks" The wide end is about half the size of a popsicle stick and it tapers to a blunt point.

    Following Crazy Jim's advice, I colored the wide end of the pick with a sharpie and used it to mark the body tube and the fins for the fillet. The area was masked with tape and the epoxy buttered in place. The fillets were then smoothed with the tool and the tape pulled after they had few minutes to set. I'm happy with the results. There shouldn't be too much work to finish smoothing them out once the epoxy is fully cured.
    PSX_20181124_170458.jpg
     
  5. Nov 29, 2018 #5

    NateB

    NateB

    NateB

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    Now that the epoxy is well cured and the recovery attached, this little rocket is at a whopping 34 grams. It still needs paint and decals, but I think we will fly it naked tomorrow afternoon. My 3 yr old son is convinced it will fly "up, up, up, into space", but Open Rocket sims to 256 ft with an A8-3 and 607 ft with a B6-4. The A motor might be a little too slow off the pad.
     
  6. Dec 7, 2018 #6

    NateB

    NateB

    NateB

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    We had a successful maiden flight this evening on a B6-4. My 3 yr old son was excited to see his first model rocket take off, but he didn't want to push the button this time. It came down fast under the streamer and landed nearby on frozen grass without any damage. I think this little rocket has earned a paint job and will hopefully enjoy many more flights.

    PSX_20181207_171114.jpg PSX_20181207_171231.jpg

     
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