Tom Corbett' Polaris

Discussion in 'Low Power Rocketry (LPR)' started by BruceS, Nov 13, 2019.

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  1. Nov 13, 2019 #1

    BruceS

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    I love the Tom Corbett Space cadet books when I was young and I've always been fasting by the rocket. I've decided that I'm going to build my own version of the Polaris. Unfortunately in the books that I have there are three illustrations of the Polaris and all three are completely different and none match up the descriptions perfectly in the book. So I decided to go with the second photo, three fans three landing struts and I'm basing it off of the Semrock VF261 as it has the right overall profile. Step one is to come up with a usable landing strut. As apparently these are supposed to be hydraulic not spring-loaded I'm just going to put rigid ones in and hope for the best. I'm starting with quarter inch dowling that I am turning down in two stages to simulate the hydraulic. Wish me luck. IMG_20191113_175754.jpg IMG_20191113_175754.jpg
     

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  2. Nov 14, 2019 #2

    BABAR

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    Good luck!
     
  3. Nov 16, 2019 #3

    BruceS

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    Progress report: Fins and landing struts attached. Strut stabilizers and feet next.
     

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  4. Nov 16, 2019 #4

    mbeels

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    That's looking good so far, how did you turn down the legs? Do you have a lathe?
     
  5. Nov 16, 2019 #5

    BruceS

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    Chucked the dowel in my cordless drill and used an x-acto chisel blade. Then medium, fine, and wet/dry sandpapers. My lathe can't handle anything that small.
     
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  6. Nov 17, 2019 #6

    BruceS

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    IMG_20191116_210237.jpg struts complete
     
  7. Nov 17, 2019 #7

    neil_w

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    Those struts look great... I'm trying to figure out how they're going to survive a landing though. How are they anchored into the body?
     
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  8. Nov 17, 2019 #8

    BruceS

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    Just glue right now. Going to reinforce with epoxy and plan on a good sized chute.
     
    Last edited: Nov 17, 2019
  9. Nov 17, 2019 #9

    scadaman29325

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    Wow, that is nice!
     
  10. Nov 27, 2019 #10

    BABAR

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    Another option would be a removable external attachment of the shock coming out the tail.

    Basically a small Kevlar loop sticking out the motor mount. Attach a fishing swivel with a Kevlar thread line when you launch it, run it up the side with the launch lug or buttons when you launch it, tuck it away for display.
     
  11. Nov 27, 2019 #11

    BruceS

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  12. Nov 27, 2019 #12

    John Taylor

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    Nice project! Can't wait for more.
     
  13. Dec 13, 2019 #13

    BruceS

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    Dummy Nozzle.jpg Created a dummy nozzle for the engine cluster. trouble is I don't have a 3D printer and getting 8 of these little things from a commercial printer is more than I want to spend.
     
  14. Dec 20, 2019 #14

    BruceS

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    So I found a printer at a nearby library. Came out great, but twice as large as I need. Need to make some adjustments to the middle then back to the printer! IMG_20191219_144616_925.jpg
     
  15. Dec 21, 2019 #15

    Scott_650

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    And now, after you build the first version, you’re all set for an upscaled one!
     
  16. Dec 29, 2019 #16

    BruceS

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    IMG_20191228_220455.jpg Second try. Half the size needed.
     
  17. Dec 29, 2019 #17

    BruceS

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    IMG_20191228_144238_01.jpg Third time's the charm! All 8 perfect. Now to sand and mount.
     
  18. Dec 31, 2019 #18

    BruceS

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    Mounted with Rocketpoxy. IMG_20191230_195318.jpg
     
  19. Dec 31, 2019 #19

    mbeels

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    I have to admit, that wasn't quite where I expected the nozzles to go. Now I'm even more curious to see the final rocket. I like the attention to detail, this is a very unique rocket!
     
  20. Jan 1, 2020 #20

    BruceS

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    Needed to leave a gap for the launch rod. IMG_20191231_073012.jpg
     
  21. Jan 2, 2020 #21

    BruceS

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    IMG_20200102_093131.jpg Primed, ready for final painting.
     
  22. Jan 2, 2020 #22

    mbeels

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    Looking good, do you know what your paint scheme will be?
     
  23. Jan 2, 2020 #23

    BruceS

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    Sticking with the book description: shining silver. Am going to try THE WORLD'S SILVERIEST SILVER from Culture Hustle with some black detailing.
     
  24. Jan 2, 2020 #24

    neil_w

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    Wow, you're not messing around. Am eager to hear your experience with this paint. Are you going to brush or spray?
     
  25. Jan 2, 2020 #25

    BruceS

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    Airbrush
     
  26. Jan 8, 2020 #26

    BruceS

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    IMG_20200107_190937.jpg IMG_20200107_190918.jpg IMG_20200107_190907.jpg IMG_20200107_190918.jpg IMG_20200107_190907.jpg IMG_20200107_190937.jpg IMG_20200107_190918.jpg IMG_20200107_190907.jpg Rocketship Polaris, reporting for duty. Tentative launch date: 1/11/2020
     
  27. Jan 8, 2020 #27

    mbeels

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    Ah, that is indeed very silvery! Now I understand the engine bells and nozzles. Good luck with the launch!
     
  28. Jan 8, 2020 #28

    Mugs914

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    That is great!!
     
  29. Jan 9, 2020 #29

    BABAR

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  30. Jan 9, 2020 #30

    neil_w

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    Emphasis on the "soft landing" part. Those landing legs will be in my prayers. :)
     
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