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  • #31
    Great work, Tom. Add yaw string, balance and you're good to go!

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    • #32
      Spent the past few days working on detail bits. Wing tip wheels required a bit of re-profiling work on the base, then painted them with automotive urethane. The airframe is also supplied with very scale wing linkage fairings, in the event one uses a top-exit arrangement (as I did).

      Finally, added the call sign...double X-ray flies again!

      Tom

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      • #33
        Tom, as always, was very thoughtful and thorough in his description of his build and all of that effort has really been a gift. I can't thank him enough.

        I only diverged from his build in one way: driving the elevator with two servos. Likely overkill on my part but I wanted the peace of mind that a redundant setup brings.

        While I started out trying to put two thin wing servos in the tail, it ended up being a multi-day fools errand so I decided to use independent bellcranks driven by carbon pushrods attached to servos behind the main landing gear. This method ended up taking quite a bit of real estate in the tail so I will have to use a pushrod for the rudder as well. All of this likely saves a bit of weight in the tail but, for a glider of this size, likely won't matter much.

        The only thing I did remotely Watson-worthy was to use these pushrod guides from McMaster-Carr to support the pushrods mid-way down the fuselage:

        McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.


        And a link to the pushrods purchased from Goodwinds Composites:

        PCT .315" x 48" Pultruded Carbon Tube - 5/16 inch structural composites for aerospace, industrial components, sports equipment, hobbies


        The bellcranks were fashioned from 3/32" G10 with some carbon reinforcement. The bearings are brass tubing.

        Mike
        Attached Files
        Last edited by yyz; 08-04-2020, 01:26 AM.

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        • #34
          Pretty clever, especially the slotted bellcranks to allow for the offset stab pin arc.
          Tom

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