Horizontal stabiliser splice tube

Discussion in 'Pitts' started by VH-ZSJ, Nov 9, 2018 at 9:59 AM.

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  1. Nov 9, 2018 at 9:59 AM #1

    VH-ZSJ

    VH-ZSJ

    VH-ZSJ

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    6571F2CE-9363-44B1-80DC-2DA613758C34.jpeg Can anyone confirm that the 3/4 leading edge tube finishes 2” inside the splice tube to allow the splice to slip over the stabiliser support tube? There is no dimension on the plans and the drawing shows a dashed tubing running all the way through instead of stopping half way through.
     
  2. Nov 9, 2018 at 11:51 AM #2

    billdit

    billdit

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    Compare the id of the leading edge tube to the od of the stabilizer tube. I am guessing the leading edge tube goes all the way to the end.
     
  3. Nov 9, 2018 at 1:29 PM #3

    cwilliamrose

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    It would have to be 2" or a bit more for the parts to fit together and the bolt holes to line up. The LE tube is the same diameter as the H-tube so it has to be recessed inside the doubler tube. This is one of the few odd omissions in the Aviat plans. The old S-1C plans show the recessed end of the LE tube at 2.5" from the end of the doubler tube.

    ScreenHunter_1346.jpg
     
  4. Nov 9, 2018 at 3:30 PM #4

    bf92

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    Check the length of the H-tube, and compare the centerline distance to the end of the H-tube compared to the centerline of the stabilizer. Just from memory, it seems to me that it was 2". It is not critical, but you want the stabilizers to be in alignment with each other, not canted forward or aft.

    Danny
     
  5. Nov 9, 2018 at 3:46 PM #5

    lakeracer69

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    I would look at the splice tube for guidance. As long as there is room to bolt the center splice tube to the horizontal stab leading edge tube ( in your drawing above) the length just needs to be short enough to allow bolting the parts together. If there are some rosette welds required you need to have enough "tube stuffed in the other tube" so the welds aren't right at the end. The picture below is from different plans, but the concept is the same.

    0051.jpg
     
  6. Nov 11, 2018 at 5:03 AM #6

    VH-ZSJ

    VH-ZSJ

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    That 2.5” dimension off the old plans is what I’ll use then. Makes sense to not have them but up against each other otherwise it could push the stab out of alignement. Thanks
     

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