Switchblade XP from Arkansas [J&H Aerospace]

Discussion in 'Rocket Boosted Gliders' started by Crawf56, May 11, 2018.

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  1. May 11, 2018 #1

    Crawf56

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  2. May 11, 2018 #2

    Crawf56

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    Alright, the Switchblade-XL comes with really good instructions. There is a parts list, and everything is well packaged. The balsa is of very good quality.

    m_IMG_2893.jpg m_IMG_2894.jpg
     
  3. May 11, 2018 #3

    Crawf56

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    So, let's check the parts.

    m_IMG_2895.jpg

    There is also an assortment of small components in a bag.

    m_IMG_2896.jpg
     
  4. May 11, 2018 #4

    Crawf56

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    Be aware that there are some LITTLE parts, which can be a challenge:

    m_IMG_2897.jpg

    I decided to keep them on a sheet of paper, so I can SEE them!
     
  5. May 11, 2018 #5

    Crawf56

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    But all the parts were there:

    m_IMG_2898.jpg

    NOTE: Some of the little hooks where stuck in with the clay.
     
  6. May 11, 2018 #6

    aerostadt

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  7. May 12, 2018 #7

    Crawf56

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  8. May 12, 2018 #8

    Crawf56

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    Starting with the wings. There is an insert to help the alignment of the reinforcing layers.

    m_IMG_2899.jpg

    Adding the hook, bushing, and guide.

    m_IMG_2900.jpg
     
  9. May 12, 2018 #9

    Crawf56

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    More views of the small parts. This is part of the swing wing mechanism.

    m_IMG_2901.jpg m_IMG_2902.jpg
     
  10. May 12, 2018 #10

    Crawf56

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    More views. Man, putting all this together was challenging. Used CA glue, per the instructions.

    m_IMG_2904.jpg m_IMG_2905.jpg

    By the way, one of the loops went 'ping' out of my mini-needle nose pliers. VANISHED. Had to fashion another one.
     
  11. May 12, 2018 #11

    Crawf56

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    Working on the fuselage. Metal parts wrapped with filament [kevlar string].

    m_IMG_2907.jpg


    m_IMG_2908.jpg
     
  12. May 12, 2018 #12

    Crawf56

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    Working on the engine mount.

    m_IMG_2909.jpg
     
  13. May 12, 2018 #13

    Crawf56

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    Starting to look like an airplane..... er, rocket glider.

    m_IMG_2910.jpg
     
  14. May 12, 2018 #14

    Crawf56

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    Ever forward! (and quickly, when you use CA glue)

    Got the engine pod on:

    m_IMG_2911.jpg

    And here is the nose cone. That piece of wire is very special, and is secured with kevlar string.

    m_IMG_2912.jpg
     
  15. May 12, 2018 #15

    Crawf56

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    OK, time to rig the wing swing mechanism. Start by attaching kevlar string to loop, and running UNDER the hinge arm. (See where the pencil is pointing.)

    m_IMG_2913.jpg m_IMG_2914.jpg
     
  16. May 12, 2018 #16

    Crawf56

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    Note that I used a rubber band to hold the wings in "launch" or "folded" position. This is a very big, very loose hold on the wings.

    m_IMG_2915.jpg

    Running the kevlar string.

    m_IMG_2916.jpg
     
  17. May 12, 2018 #17

    Crawf56

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    Still must be careful to run the string under the hinge arm. Note that the model is upside down.

    m_IMG_2917.jpg
     
  18. May 12, 2018 #18

    Crawf56

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    Alright, got the rubberband in place......

    m_IMG_2918.jpg

    ...and pop the nose cone. It works! :surprised:

    m_IMG_2920.jpg

    Looking at the top of the wing.

    m_IMG_2919.jpg
     
  19. May 12, 2018 #19

    Crawf56

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    I would rate this engineering design as: NIFTY. :headbang:

    The ejection of the nose cone allows the string to go SLACK. This allows the wing to rotate into position, with the rubber band pulling (and holding) the wing.

    Pretty neat. :w:
     
  20. May 12, 2018 #20

    Crawf56

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    So, being me, it is time for something to go Wrong. I am supposed to crimp and epoxy the aluminum tubes on the hinge arms to keep the wings in place.

    Kind of over-crimped. This is why God made 5-minute epoxy.

    m_IMG_2921.jpg
     
  21. May 12, 2018 #21

    Crawf56

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    Time to work on the tailfeathers (elevator and rudder). Rather than use the iron on covering supplied in the kit, I am going to use Blenderm tape (made by 3M) for my hinges.

    m_IMG_2922.jpg
     
  22. May 12, 2018 #22

    Crawf56

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    Working on the elevator. Making a bevel for the hinge surface.

    m_IMG_2924.jpg m_IMG_2925.jpg
     
  23. May 12, 2018 #23

    Crawf56

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    Put down about a 2 inch strip of Blenderm on each side, on the non-beveled surface. Had about a 1/2 millimeter gap between the elevator and the horizontal stabilizer.

    m_IMG_2926.jpg

    Now attaching Blenderm to the beveled side.

    m_IMG_2927.jpg
     
  24. May 12, 2018 #24

    Crawf56

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    And using my fingernail to stick the Blenderm into the hinge gap.

    m_IMG_2928.jpg

    Blenderm is very sticky. If you don't like your hinge, then cut it with an xacto knife. Leave the old tape in place, and re-apply. Blenderm is also sold as "Hinge Tape" by Dubro.

    m_IMG_2929.jpg
     
  25. May 12, 2018 #25

    Crawf56

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    Attaching control horns. (Come with kit.)

    m_IMG_2931.jpg

    Gluing on the horizontal stabilizer & elevator.

    m_IMG_2932.jpg
     
  26. May 12, 2018 #26

    Crawf56

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    Attaching the fin and rudder.

    m_IMG_2933.jpg

    And I screwed up......:eyeroll:
     
  27. May 12, 2018 #27

    Crawf56

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    Got my control horn location messed up. :bang:

    m_IMG_2934.jpg

    Well, that won't work. So, I snipped off the elevator control horn.

    m_IMG_2935.jpg
     
  28. May 12, 2018 #28

    Crawf56

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    Making a new control horn from left over part 'tree'.

    m_IMG_2936.jpg m_IMG_2937.jpg
     
  29. May 12, 2018 #29

    Crawf56

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    When you screw up a lot, you learn to fix it. :smile:

    New control horn......

    m_IMG_2938.jpg

    .....glued in place.

    m_IMG_2939.jpg
     
  30. May 12, 2018 #30

    Crawf56

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    Over the years, I have learned that a single color model is difficult to see in the sky. So, I painted the bottom orange.

    m_IMG_2941.jpg

    And the top is white.

    m_IMG_2940.jpg
     

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