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H9 ASH 31 build, notes and questions

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  • #61
    Finished fabricating my new CG machine so I got a chance to try it out on the ASH31. Worked like I had hope and was very stable.
    Straight sailplane (no motor), fully flight configured it needed 34.4oz (2.15lbs.) to get it to balance right in the middle of the published CG range.
    Click image for larger version  Name:	 Views:	1 Size:	170.8 KB ID:	33317
    Click image for larger version  Name:	 Views:	1 Size:	145.2 KB ID:	33318

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    • BryanB
      BryanB commented
      Editing a comment
      No bushing or bearings. I've been thinking this thing through for a year. I really wanted one of those "EZBalancers" but after seeing they are $230 I figured I could fabricate my own for less. Ended up being a little over $100 with all new material and hardware. I used 1/4" 6061 aluminum for everything above the tracks. Could probably have saved a couple bucks but by just using flat bar for the spacing bars with holes drilled in them but went with U channels instead.
      As for bushings, not needed. It's not like this thing gets a lot of use and with medium/heavy models rotation friction is negligible. Put your model up there, find your balance and then off. Not a lot of wear. Besides, 6061 is pretty tough aluminum.

    • ARUP
      ARUP commented
      Editing a comment
      Your balance stand is nice! It look as if a strutted wing would fit, too! I bought one of those pricey German made stands and can't use it with the vintage birds, : (

    • edfmaniac
      edfmaniac commented
      Editing a comment
      Very nice work.

  • #62
    31 is very close to being done now. I started off finishing off the wiring and harnesses for the fuse. Got everything situated, then trimmed and installed the cockpit tub, fits perfectly over my radio setup! I had some of the velvet left over from one of my 20's that never got a cockpit, so I used that to dress up the tub a bit.

    Then it was time to finally put the wings on! This is about as big a sailplane as I can fit in my shop. Got all the control surfaces, flight modes and throws set up. Still have some setup to do with the AS3000, but the radio is basically ready now.

    Got the vinyl done on the fuse. I learned to fly full size sailplanes at Harris Hill. so I'm basing the N number and contest number on "If HHSC had a 31". The dark blue really looks good with the orange! Bottom of the wings still to go and need to get something to cover up the painted on German flag.

    While it was all assembled I got it up on the balance stand. Used lead in the cockpit tub to simulate the Tailored Pilot that is on order. It took 28oz to balance at 75mm, which is in the middle of the suggested range. I put 20 oz of lead shot mixed with epoxy into the nose and will keep the other 8 as removable to dial it in.

    So close to finished... too bad its -5 outside!
















    Last edited by Sinkhappens86; 01-31-2019, 03:08 AM.

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    • #63
      Very nice Kevin. Looks great!

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      • ARUP
        ARUP commented
        Editing a comment
        Looks like Kevin had so much fun getting his 31 together that I'll just have to trade my yet to be started one for his so he can have fun all over again! Merry Christmas... early!

    • #64
      Here is my mods on the electric LG

      Just in case you would flip the wrong switch at the wrong time and destroy the electrical mechanism. Here is my way to convert the electric landing gear that has a great mechanism to a servo operated LG.
      I used a 1x1in aluminum angle, a programmable servo and 0.04 music wire for the spring.


      Sans titre by steffruelle, sur Flickr


      Sans titre by steffruelle, sur Flickr

      Sans titre by steffruelle, sur Flickr

      Sans titre by steffruelle, sur Flickr

      Sans titre by steffruelle, sur Flickr

      Sans titre by steffruelle, sur Flickr

      St├ęphane
      Horizon Hobby Team Member

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      • #65
        Nice Stephane
        Will probably do the same on Michael's!

        Jeremy
        SCCAAA TT TN

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        • #66
          Nice Stephane,
          Looks like the one we made in Windy Ridge. Works really well.
          Len Buffinton
          Team Horizon Hobby

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          • French1
            French1 commented
            Editing a comment
            I took inspiration on your work with Scott, that was a great filed repair that allowed me to fly the entire season

        • #67
          Stephane, where did you get the "G10 Arm"?

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          • French1
            French1 commented
            Editing a comment
            I made it myself from a G10 plate I bought online, cut it with a hacksaw and sanded it, then press drilled it, and tapped the gear for 4-40 screws.

            Another avenue is to use a boat rudder arm, metal of course as I tried with plastic and doesn't work...

            BTW the axle of the arm is a 3mm one

        • #68
          Stephane, thank you for the info. I now have another question. I bought a 180 degree servo and I can get it to move 180 on the servo tester in extended mode. Yet when I plug it into the receiver and try to move it with the TX, I only get 60 degrees of movement. The travel is set to 150%. Any idea of what I should do?

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          • French1
            French1 commented
            Editing a comment
            if you have +150 -150 it means that the servo is not programmed or that the programming has not been saved
            What is the servo you are using?

        • #69
          The servo is a robotic servo, it's a Hobbypark digital 180. I called Horizon about my iX12 to see if there was something I could do different. But doesn't look that way. I just purchased the "Servo Stretcher". It makes any servo swing 180 degrees.

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          • #70
            As I am waiting the snow to melt, I changed the elevator connection to use a Sullivan Ball connector, and it is much easier to connect the stab to the servo. Clearance is just what is needed...

            Stock linkage vs mods

            Sans titre by steffruelle, sur Flickr

            Just enough room...

            Sans titre by steffruelle, sur Flickr

            Introduction of the linkage from the rear

            Sans titre by steffruelle, sur Flickr

            With the angle, no problem for the linkage room

            Sans titre by steffruelle, sur Flickr

            The magic no slop linkage

            Sans titre by steffruelle, sur Flickr
            St├ęphane
            Horizon Hobby Team Member

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            • #71
              CG smack dab in the middle of the 60-85mm marks. Landing gear waiting on Fedx to arrive with linkage. Then it will be ready to maiden.

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