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  1. Rudy Lee

    Flight Club - Ultralight Build Log

    Yes, there is no leading edge anymore. After some research, we determined that scalloping wouldn't be an issue.
  2. Rudy Lee

    Flight Club - Ultralight Build Log

    We tried a bunch of different methods to get it to adhere along the curve of the leading edge, but it just wouldn't go on well. For the trailing edge we were just able to use a brake and bend the metal at an angle. For the leading edge we would need a giant roller to get it to shape
  3. Rudy Lee

    Flight Club - Ultralight Build Log

    That makes a ton of sense! Thanks for the explanation.
  4. Rudy Lee

    Flight Club - Ultralight Build Log

    Awesome! That makes sense. Now we can seam it in three points - trailing edge, and both the top and bottom of our rib support blocks around 40% chord
  5. Rudy Lee

    Flight Club - Ultralight Build Log

    Would it work to have our fabric overlap around mid-chord instead of on leading and trailing edge? That would solve our problems
  6. Rudy Lee

    Flight Club - Ultralight Build Log

    Yeah, I think this might have to be our solution. We read that leading edges weren't necessary as scalloping wasn't an issue. But I suppose it would be necessary for the fabric attachment. Do you have any recommendations about leading-edge material? We tried our super-thin (can't remember exact...
  7. Rudy Lee

    Flight Club - Ultralight Build Log

    Yep, this would be totally doable, my only concern is that there would be no surface perpendicular to the wingspan to adhere it to
  8. Rudy Lee

    Flight Club - Ultralight Build Log

    One more fabric covering question: I've just finished reading through the poly-systems covering manual and the only thing I still don't understand is exactly where/what we should be gluing the fabric to. In the manual, it says to only glue it down to the trailing edge, leading edge, butt rib...
  9. Rudy Lee

    Flight Club - Ultralight Build Log

    Thanks for all the advice - you are totally right, we definitely have a lot of testing in front of us. We'll try out the 30nf and poly tak and see how they turn out - we'll keep you posted :)
  10. Rudy Lee

    Flight Club - Ultralight Build Log

    Good to know that we can just sand and clean - thanks! Since we already have poly-tak, would you still recommend using 30nf? Is it that good? If so, awesome.
  11. Rudy Lee

    Flight Club - Ultralight Build Log

    We will be thinning our poly-tak with their reducer. It says the mek wont work as a thinner. I don't think we really have an issue with melting as long as we cover the exposed foam. The main question is if we need to apply any chemicals to prime the fiberglass or could we just sand it?
  12. Rudy Lee

    Flight Club - Ultralight Build Log

    We have poly systems MEK just in case we need it
  13. Rudy Lee

    Flight Club - Ultralight Build Log

    I couldn't seem to find this type of glue online? What are the benefits of using it over the poly-tak?
  14. Rudy Lee

    Flight Club - Ultralight Build Log

    the foam will melt when in contact with polytak. However, our fiberglass rib caps are fine when in contact and we will be taping over all exposed foam. The main question is how to prepare the fiberglass for proper adhesion
  15. Rudy Lee

    Flight Club - Ultralight Build Log

    Hi all, another question about fabric covering. We are using poly-fiber systems and found some differing explanations on how to prepare our fiberglass rib caps for poly tak gluing. Stits website seems to infer that we can just sand the top with sandpaper (FAQ's, How do I paint over composites or...
  16. Rudy Lee

    Flight Club - Ultralight Build Log

    all good - we've CFDed a chordwise lift distribution for our actual ribs which we've used in a lot of tests :)
  17. Rudy Lee

    Flight Club - Ultralight Build Log

    Ooh this will definitely be good to remember for testing loads. Thanks!
  18. Rudy Lee

    Flight Club - Ultralight Build Log

    The current design is just bonding aileron ribs to torque tube. Once I run the numbers, if it turns out that they need extra support, we were thinking of 3d printing nylon flange rings that we would epoxy on to increase surface area in contact with the tube. Also thanks for the gluing tip :)
  19. Rudy Lee

    Flight Club - Ultralight Build Log

    This is exactly the source I was looking for! Thanks a bunch
  20. Rudy Lee

    Flight Club - Ultralight Build Log

    Hi all - I have a few questions about our wing as I get ready to start attaching the fabric. 1. do we need to attach the fabric to our false ribs? (see first photo below, false ribs in red, normal ribs in green.) It would add a bit of extra weight to cover our false ribs with epoxy such that the...
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