Chiru's Acrosport 2

Discussion in 'Acrosport' started by chiru, Jun 1, 2018.

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  1. Jun 15, 2018 #41

    taff

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    Nice work Chiru and good looking welds.
    One question (photo below) maybe it doesn't need a cross brace.

    IMG_7559[1].jpg
     
  2. Jun 15, 2018 #42

    smizo

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    acrosport doesn't have a tube there, just a rib.
     
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  3. Jun 17, 2018 #43

    chiru

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    Here we go ! First step by itself :)

    4A356E37-ACCF-4CDE-B997-7A9D3060CFBD.jpeg

    The camber looks symetrical

    6B4A56C8-0DBB-461C-8D48-7FADE8B78DAB.jpeg
    EC79624E-2B2C-4B06-8E20-C4E00E5B11EE.jpeg

    But one strut arm is about 1/16” longer than the other. The strut attach on the fuselage is maybe 1/32” away from the middle that creates this difference. I opted for measuring each arm and camber separately and not to make both absolutely identical.
    Anyway, the impact would be about 0.3 degrees, I think it wouldn’t matter much.
     
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  4. Jun 17, 2018 #44

    Neil

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    Little errors have a way of accumulating and multiplying. What you want to check here is if the fuselage is level as it sits on the gear. This will make building and rigging throughout the build easier if you aren't constantly compensating for something.
     
  5. Jun 17, 2018 #45

    chiru

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    Wheels on the ground, the fuselage il level and the fin spar 89.9 degrees. Could be worse.
     
  6. Jun 17, 2018 #46

    smizo

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    You’re in good shape....... don’t tell anyone but one of my struts is 1/8” shorter than the other to make it correct...... ;)
     
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  7. Jun 18, 2018 #47

    Larry Lyons

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    But those wheels are going to be expensive to maintain. Take it from me wheel life will increase immensely with tires. :rolleyes:
     
  8. Jun 18, 2018 #48

    chiru

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    I’ll put the tires on after the brake plates are welded. It’s more convenient to move the rims and make all measurements without tires. Sure I won’t drive with full load like that ;)
     
  9. Jun 21, 2018 #49

    chiru

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    I am in preparing to weld the brake plates. I would like to place the caliper or in front or forward. The problem is that there is not enough place for the nuts. They touch the arms/welds at correct axle length. Maybe I placed the arms too short or the welds are too thick.
    (Picture just for illustration, not right positioning)

    38A82914-07A7-49CB-8253-F342949904DC.jpeg

    I see several solutions :
    1. Move the plate 1/8 - 1/5 outboard
    2. Use flat nuts as there is no axial force on the bolt
    3. Trim a bit the welds
    4. Do another plate with 2 smaller holes (the ones in conflict) and une bolts one size below. The brake support comes with dowels, I guess it’s for that...
    EA385667-B11E-44CA-9B68-B337A2598566.jpeg

    What would you recommend ?
     
  10. Jun 21, 2018 #50

    smizo

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  11. Jun 21, 2018 #51

    chiru

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    Maybe there is much place needed for 6.00x6 and it seems you have AN5 instead of AN6 bolts
     
    Last edited: Jun 21, 2018
  12. Jun 22, 2018 #52

    Neil

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    MS21043 reduced hex nut may help you out.
     
  13. Jun 22, 2018 #53

    chiru

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    I prefer using locking nuts or stops instead of reduced/thin ones.
    I ordered this one. Let's see how it fits
    nut.jpg

    Using 4 AN6 bolts per wheel, 2 with low profile nuts and 2 with normal stop nuts should be more than enough.
     
  14. Jun 22, 2018 #54

    acrosport11

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    just purchased a acro sport 2 project, will be watching. also getting ready for oshkosh
     
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  15. Jun 27, 2018 #55

    chiru

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    With low profile bolts there is enough space.

    75920EEE-32E9-45B2-A408-712F9547B6DA.jpeg
     
  16. Jul 3, 2018 #56

    chiru

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    As for the second inspection (in France) the inspector would like to see the wings in "ready to cover" status, I put on pause the fuselage and start the wings.
    IMG_7755.jpg

    Fortunately the workshop is just large enough to check the alignment.
     
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  17. Sep 12, 2018 #57

    chiru

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    I am back after some holidays, starting the upper wing bows.
    I have done it by glueing several spruce strips together. But I think I will have to use some foam to make a nice round trailing edge.
    AC2AC892-0239-4DA6-A308-EDD6A3D96CD1.jpeg 016D4F17-9ABE-43FC-93F5-971EA25A0213.jpeg E239A84E-7C05-48B6-962C-3EE5B478B376.jpeg 794AD38A-55C9-4198-A224-45C8DBBF23E9.jpeg
     
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  18. Sep 13, 2018 #58

    Neil

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    I did mine a little different by making a form and laminating up a bow with a reverse curve at the out board end. Just a personal flair I suppose. I did use balsa wood for a filler rather than foam. I'm happier working with wood. Also I glued a block to the end rib on the wing panel and formed it to blend the panels together. There will just be a very small gap between the wing and center section at the trailing edge . This will allow me to terminate the gap seal with a straight cut at the front edge of the block. IMG_5734.JPG
     
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