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  1. #126
    dave_anderson's Avatar
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    RE: Curare construction ARG


    ORIGINAL: bjr_93tz


    ORIGINAL: mobileraptor



    I presume the front servo is controlling the speed brakes and the aft servo is controlling the alerions threw a long steel wire running down the trailing edge of the wing.
    Yep, just as per plan.

    20 years later with today's cheap technology and my improved paypacket I'd ditch the concentric torque tube and rod arrangement and run 4 digital servos in the wing.....
    +1

  2. #127

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    RE: Curare construction ARG

    Chino,

    With reference to JB Weld, I am pretty sure that the traditional grey PoxiPol is pretty much the same thing. It sets in 24 hours and is rock hard.

    Kind regards,

    Kenneth

  3. #128
    doxilia's Avatar
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    RE: Curare construction ARG

    No doubt that sort of thing is "continental branding". I wouldn't be surprised if there is a Latin American version of the same thing. Then again, stores like Home Depo have gone international so it's quite possible that you might find JB Weld at a place like that in BA. I was in Mexico a couple of weeks ago but didn't think of checking whether the Home Depo had it there.

    David.

  4. #129
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    RE: Curare construction ARG


    ORIGINAL: doxilia
    I was in Mexico a couple of weeks ago but didn't think of checking whether the Home Depo had it there.

    David.

    David they do have it ....good thing to be US neighbors in some situations
    Rafa.

  5. #130

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    RE: Curare construction ARG

    I was in Miami last month and bought JB Weld from Tower.... I didný know that it is the same than POXIPOL!!!!! Nice to know it, ja!
    Chino

  6. #131
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    RE: Curare construction ARG

    With Kenneth being Argentino, PoxiPol is maybe an Argentinian product after all. I had assumed it was an English product for obvious reasons.

    David.

  7. #132
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    RE: Curare construction ARG

    ORIGINAL: alcarafa
    David they do have it ....good thing to be US neighbors in some situations
    Good to know Rafa, thanks. I'll have to let my dad know. He's still discovering all the wonders of adhesives!

    David.

  8. #133
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    RE: Curare construction ARG

    Chino

    My proposal to mount the spoilers on the brass tube.
    For me only double security is safe to use so maybe you also like my method!

    Materials are:
    Glas reinforced epoxy plate for printed circuits
    In case of not available you can make a ""cloon"; plywood with thin sheet metal glued on it with two component glue, so for exampe of a steel mouse can (NO ALUMINUM).
    Drill small holes in the sheet metal to enlarge the binding of the two component epoxiy glue.
    The cupper wire I use is from a communication cable, after removing all isolation I only use the massive core.
    Solder and 2 component epoxy glue.

    Mounting
    Depending of dimensions you can mount the plate as shown in method 1 or 2.
    Drill the small holes in the plate on right locations see drawing.
    Use some thin aluminum (heat shield) to protect the wing while soldering.
    Keep the plate in right location and angle and solder on the brass tube with two dots of solder.
    After that, wind the cupper wire around the brass tube and through the holes.
    If location and angle is alright, solder all feedthrough points of the wire if possible on both sides and also the wire on the brass tube on a lot locations.
    Remove the cupper layer that wasn't needed to solder the ware to create the location to glue the spoilers. Make grooves on the surfaces of the epoxy plate to enlarge the binding of the two component gue.
    Build up the spoiler as visible in the drawing for example top of birche plywood and bottom of balsa.
    Carve, shape and sand the spoilers.


    Merry Christmas and Happy New Year


    Cees

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  9. #134

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    RE: Curare construction ARG

    Very good method! I´ll study it and see if I can make this way.
    Thank you Cees!Merry Christmas and Happy New Year for you and your family.

    Chino

  10. #135

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    RE: Curare construction ARG

    Working on the airbrakes:



















    Will continue...

  11. #136

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    RE: Curare construction ARG

    Working on the spoiler control system:












    I´m planning to weld two pieces ofbrass strip (with holes in it like hinges) on the spoiler torque tube in order to get more glueing surface. What do you think? Does the weld will be affected by engine vibrations?




    Will continue...

  12. #137

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    RE: Curare construction ARG











  13. #138
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    RE: Curare construction ARG

    Diego,

    good to see you at it again. I think your flap/spoiler rig will work. The welding of the hinges is where the idea of JB Weld came into play. For whatever reason, that stuff will hold two parts together almost indestructibly. It is also less susceptible to vibration as it is an iron laced epoxy. Provided the surfaces are roughed up, you can "weld" them together and they will stay like that forever. It is also great stuff for welding copper couplers on to CF or steel pushrods. Much better than welding if you ask me.

    For future reference and use if it comes in handy.

    Are the wing controls all that's left to build?

    David

  14. #139

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    RE: Curare construction ARG

    Hi Doxilia,

    Yes, I´m back.

    I traveled to USA some month ago and bought JB Weld (the equivalent of Poxypol here inArgentina, thank you Kenneth!), so this way I´ll finish the spoiler-flaps.

    Then I needto work on the rest of flight controls and after a lot of sanding I´ll start the finishing process.

    By.

    Chino


  15. #140

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    RE: Curare construction ARG

    Hi Diego,

    Now that you have JB Weld, it would be interesting to see whetheror not it is nearly the same as traditional argentine grey PoxiPol as I suspect.

    Maybe you can carry out some pseudo scientific tests to see how similar or not the two products are.

    On the subject of sanding, the more the better. I see my sanding blocks not only as contouring and finishing tools but as lightening tools too, specially with the amount of wood used in traditional structures of the period.

    Best wishes,

    Kenneth

  16. #141

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    RE: Curare construction ARG

    Hi Kenneth,

    Right now I don´t have Poxipol! I´ll see if I buy one near home.

    I´m thinking to do the same finishing process than the Tiporare, but I´m not sure if I´ll paint or monokote the fuse… that´s the question.

    If you remember I had some discolorations problems in it.

    Regards,

    Diego


  17. #142
    doxilia's Avatar
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    RE: Curare construction ARG

    Diego,

    If I may make a suggestion, make sure you use a sealer primer as a first coat after glassing. I'd stay away from dopes and use finishing resin, epoxy preferably. Then, once the fuse is fully primed and sanded back with a filler primer, use another thin coat of sealer primer; preferably one that is designed for the paint you'll use. If you prep the fuse like this, you shouldn't have any paint problems.

    I'd also recommend that you paint with auto lacquer rather than urethane or enamel. Stay away from the latter in particular. The lacquer should make for a faster lighter paint job. Key, of course, after wet sanding your paint job, is the clear. Use good stuff - PPG or DuPont acrylic urethane. Or, as discussed previously, SprayMax 2K.

    David

  18. #143

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    RE: Curare construction ARG

    I have made both Curare and Sicroly with the original spoiler/flap set up and the simplest way of making the spoiler tube was not to try and butt solder the tags on the tube (It will fail rapidly from vibration) but to make the flag longer and wrap it around the tube and then solder the two tags together, and solder all round the tube, for an indestructable horn. Then drill the holes in the tags to help gluing the tube to the flap. Been flying both models for 6 years now, with no sign of failure.
    Evan, WB #12.

  19. #144

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    RE: Curare construction ARG

    David: Thank you for the paint advice. I´ll consider your "material list"!!!

    pimminz: too late! I have just glued the spoiler flaps with J-B Weld. Them look good, maybe all the stuff will be together, I hope...

    Some photos of the process:





    Now I´ve to adjust the travel and make them work properly.

    Will continue...



  20. #145

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    RE: Curare construction ARG

    Not helping here but Singapore Hobby has the flap / aileron device. Was swayed against it because I thought we'd probably go with separate servos for the ailerons.

    But, this is really some nice custom work!

  21. #146

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    RE: Curare construction ARG

    Working on the canopy latch:


























  22. #147

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    RE: Curare construction ARG

    Working on the ailerons actuators:









    With the flaps-spoilers retracted you can see that they are aligned withr the ailerons. That´s good!
    Will continue.

  23. #148

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    RE: Curare construction ARG

    Enjoyed your post. Are there any updates?

  24. #149

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    RE: Curare construction ARG

    Hi! I´m happy that you enjoyed this post.
    I´m not building right now... I´m doing another things, like flying real glider! [img]file:///C:\Users\FYD_LE~1\AppData\Local\Temp\msohtmlclip1\ 01\clip_image001.gif[/img]
    I need to be inspired if I want to do a good job.


  25. #150

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    RE: Curare construction ARG

    Can understand that!


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