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Hoerner Wingtip Build

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  • #46
    Excellent. And hearty thanks for the detailed reporting!

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    • #47
      Battson--- had you considered forming them out of non-heat-treatable aluminum ? English wheel ? That way ?
      Tim

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      • Battson
        Battson commented
        Editing a comment
        Good God no!

    • #48
      Battson--- you mentioned making kayaks---- there is that stuff that Milliken chemical produces that is being used to make rock-proof Kayak hulls---- It is a pre-preg dual filament
      polyethylene matt. You thermoform it just like making an RV canopy -- heat and vacuum (or pressure) . It is strong enough that they make military vehicle armor out of it.
      The product name escapes me at the moment--- but I can find it on-line. They will send you free engineering samples.
      Tim

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      • #49
        Here is a link to the Milliken thermoforming product - called Tegris. Its an extruded PE fiber made so there is a core part of the fiber which has a higher melting point
        than the surrounding cladding. The fibers are woven into cloth or mats similar to glass cloth. Once heated- the cores stay in solid phase and the cladding melts and bonds all
        the layers together (like it was a resin in fiberglass/acrylic) and creates a solid mass with the cores intact as strength members. It is so strong they have made armor plates
        out of it. Kayaks that are rock-proof. Floor boards for Mercedes cars----
        Looks like you have to compress it into the desired shape while you heat it. That - I suppose could be done with a vacuum bag...… and maybe heated with steam
        from a pressure cooker. Here is the link---

        http://tegris.milliken.com/en-us/tec.../overview.aspx

        Tim


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        • #50
          Interesting. Kind of a pre-preg cored laminate. My guess is it would be rather expensive.

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          • #51
            My version of the hoerner made of 2024T3 aluminum

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            • #52
              More wingtip progress

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              • #53
                That looks very strong. What does it weigh?

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                • Gerhard Rieger
                  Gerhard Rieger commented
                  Editing a comment
                  I weighed all the components and it came to 7lbs ea, that exclude the lens.

              • #54
                Originally posted by Gerhard Rieger View Post
                More wingtip progress
                Originally posted by schu View Post
                That looks very strong. What does it weigh?
                A good question!

                I didn't weigh my fibreglass Hoerner tips which I posted about on the previous pages, but I would estimate they are several pounds each. Four or five pounds each would not surprise me.

                The really interesting question is, how much more do they weigh compared to the factory tips? I can remove about 50 screws to find out....

                Now that I know the plane's new limits, I am seeing touchdown speeds at 30 KTAS with light tanks and two people up. So I don't mind the weight increase, whatever it is.

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                • #55
                  Originally posted by Battson View Post



                  ...Now that I know the plane's new limits, I am seeing touchdown speeds at 30 KTAS with light tanks and two people up...
                  Good to hear!

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                  • #56
                    I have seen some planes with small fences at each end of the flaps, sometimes on the bottom, sometimes on the top, sometimes both. Has anybody heard any pireps on those mods? Seem pretty easy to do.

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                    • #57
                      There are fences like those in the Patrol plans. I asked about those in the past, and I recall the answer being that Bob didn't find they made any noticeable difference.
                      ​Christopher Owens, EAA #808438
                      Project "Expedition"
                      Bearhawk 4-Place Scratch Built, Plans #991
                      Bearhawk Patrol Scratch Built, Plans #P313
                      Germantown, Wisconsin, USA

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                      • #58
                        Bobs planes have comparatively huge flaps, albeit just plain flaps. Cheap mod to install and check out the difference.

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                        • #59
                          I have known all along I would put Hoerner style tips on my Bearhawk. Only question was do I buy the tips from TQFiberglass and install them to fly sooner or go ahead and make them now. Couldn't see paying for those tips, taking the time to install them, just to remove them later. Considered trying to build them out of metal, similar to those on Vans RV-12 but have decided to build them very similar to Jon's but with carbon fiber instead of fiberglass. Appreciate all the great ideas in this thread and others. Will post on progress.

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                          • Battson
                            Battson commented
                            Editing a comment
                            14 hrs sanding to make my own tips... that was just the sanding, never mind the rest. That time, spent at paid work, pays for a lot of wingtip.
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