Build threads: EAC.....

Discussion in 'Low Power Rocketry (LPR)' started by kuririn, Mar 7, 2020.

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  1. Mar 10, 2020 #31

    jlabrasca

    jlabrasca

    jlabrasca

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    viperdeaca_foridentl.jpg
    viperdeacalident2.jpg

    Its two different typefaces, at least. When I was laying out the skins for my upscale, the closest I could find for the lowercase letters in the club name was a Letraset Helvetica bold varient (didn't think to record the catalog number). The small cap "P" in aerospace is a different typeface.

    I couldn't find a good match for VIPER cartouche -- so I just traced it in Illustrator.
     
  2. Mar 10, 2020 #32

    kuririn

    kuririn

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    Second build: EAC Firecat
    [​IMG]

    Parts:
    Body tube BT-50 9.5"
    Laser cut fin sheet (from erockets)
    Balsa nose cone BNC-50BD
    Screw eye
    Shock Cord
    Kevlar leader (subbing for tri-fold shock cord anchor)
    12" parachute (salvaged from another rocket)
    Launch lug 2"
    Centering rings CR 20-50
    Engine hook Standard
    Thrust ring (not part of original)
    Mylar hook retainer (subbing for masking tape)
    Motor tube BT-20 2.75"
    Pod tube ST-8F 2.5" (Subbing for BT-48)
    Decals (from erockets)
    0309202034.jpg



    Original pod tube was a BT-48 at .928" OD. Couldn't find a vendor that sells this size tube, don't know if it's even being manufactured anymore so I subbed an ST-8F from erockets. At .921" OD it's 7/1000ths of an inch too small.
    Hey, I won't tell if you won't tell.;)

    Assembled the motor mount. Forward ring is notched for the Kevlar. Aft ring is split to allow flex of the engine hook.
    0309202121a.jpg

    Will let this dry overnight. Aft ring is nestled in a piece of scrap BT-50 tubing to keep it's shape.
    TBC
     
    Last edited: Mar 11, 2020
  3. Mar 11, 2020 #33

    kuririn

    kuririn

    kuririn

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    The balsa pieces were removed from the sheet and the laser cut edges were sanded lightly to remove the char and tics.
    The fins(wings) are an unusual configuration.
    0310202141.jpg

    Used an angle tool and square wooden dowel to keep the parts at 90 deg. while the glue dried.
    (Being careful not to glue the tools to the balsa).;)

    0310202140.jpg
    Will fillet after glue dries.
    TBC
     
  4. Mar 11, 2020 #34

    BABAR

    BABAR

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    Wax paper makes a nice “buffer” to prevent undesired adhesion of various jigs and supports.
     
  5. Mar 11, 2020 #35

    kuririn

    kuririn

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    Right you are sir!
    BTW I noticed one of the new smileys. Is this you?:dancingelephant:
    I don't remember if Babar was pink.

    Got the fillets on the wings
    0311200145.jpg

    The pod standoff and the raceway piece are on the right of the pic.

    Qualman fin guides not only are useful fin jigs, but they can also be used for marking fin lines on body tubes instead of a cut out paper fin guide.
    Here a pencil mark is made at the 0 deg. spot. Three more marks are made at the 90 deg left, 90 deg. right, and 180 deg. spots for a cruciform alignment.
    0311200139.jpg
    The tic marks are extended with an angle tool
    0311200142.jpg

    The engine hook on the motor mount is lined up with the raceway line and the mount is glued in, tube ends even.
    0311200426.jpg

    The square dowel is an excellent tool for squaring up the tubes.
    Will let these dry, be back in a few hours.
    TBC
     
    Last edited: Mar 11, 2020
  6. Mar 11, 2020 #36

    BABAR

    BABAR

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    BABAR was originally intended to mean Born Again Born Again Rocketeer. That said, I'm happy to be thought of as a dancing pink elephant!

    Square Dowel! Almost sounds like an oxymoron, but I can see how such would prove helpful.
     
  7. Mar 11, 2020 #37

    kuririn

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    Last edited: Mar 11, 2020
  8. Mar 12, 2020 #38

    kuririn

    kuririn

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    The body tube was marked, and the wings, raceway, and pod stand-off were glued to the tube.
    Left to dry in a horizontal position.
    Good night!
    0311202113.jpg
     
  9. Mar 12, 2020 #39

    GlenP

    GlenP

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    I like the shape of those wing fins, really nice looking rocket. I hope they survive landing!
     
  10. Mar 12, 2020 #40

    hcmbanjo

    hcmbanjo

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    After looking close at the Estes Firecat kit, I realized the fins (and nose cone shape) were from the old Honest John kit.
    That's why the have you cut up the fins for the fin tips. Additional raceway and pod standoff pieces were cut by hand.
    The decals are (of course) from the Estes Bandit.
    It makes me think this might have been a S.P.E.V.
    http://www.spacemodeling.org/jimz/estes/est0821.pdf
     
  11. Mar 12, 2020 #41

    BABAR

    BABAR

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    Looks good.

    Lotta lumber to finish.

    You aren’t a papering fan, I take it?
     
  12. Mar 12, 2020 #42

    neil_w

    neil_w

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    I think I've heard that before. In any case it's an *amazing* SPEV job, completely original and bearing no resemblance to the original. IMHO it is the best ever use of the HJ nose cone outside of the HJ itself.
     
  13. Mar 12, 2020 #43

    GlenP

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  14. Mar 12, 2020 #44

    kuririn

    kuririn

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    Me too!
    I got another slick looking SPEV build coming up.
    Don't know if I'm going to do a build thread though:
    0312200556.jpg
    It depends, I have used the technique several times before.
    But I have a lifetime supply of CWF, commercial and homemade sanding sealers so I'm good!
    0312200603.jpg

    I came across a Gotcha! (as hcmbanjo would put it) in the instructions
    0312200549.jpg

    Illustration shows launch lug glued to the valley between the standoff and main tube.
    I believe this is an oversight.
    With the bulbous nose cone, it will result in the rod scraping and deflecting against the nose cone.
    I decided to put it inside the pod, for aesthetic as well as practical reasons.
    0312200649.jpg 0312200648.jpg


    Fillets are on
    0312200637.jpg
    Optional antenna attached. (Love them chute catchers, if only for the visual appeal).
    Recovery gear installed.
    Pod will be pre-finished before final assembly, lesson learned from prior builds.
    So I'm calling the assembly (mostly) complete.
    Filling, sanding, primer, blah blah over the next few days.
    Will post a final finished shot of both babies.
     
  15. Mar 12, 2020 #45

    BABAR

    BABAR

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    Has your shuttle in post 38 background flown yet?
     
  16. Mar 12, 2020 #46

    kuririn

    kuririn

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    Sorry, that is a Lindberg plastic model, static display, partially finished.
    Oh, wait.
    ………..….
    PMC?:D
     
  17. Mar 12, 2020 #47

    BABAR

    BABAR

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    Probably won’t glide well!
     
  18. Mar 12, 2020 #48

    neil_w

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    Forgot that one, also great.
     
  19. Mar 12, 2020 #49

    Mugs914

    Mugs914

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    Didn't realize that was a SPEV too. What are the base parts from?

    Firecat is looking great, BTW! Wanna upscale that one...
     
  20. Mar 12, 2020 #50

    kuririn

    kuririn

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    SR-71 nose cone. This came out later, and don't see any other kits that used that nose cone, so I think this kit must be a SPEV.
     

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