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Thread: That Pesky Fabric Drumming Wing Root.

  1. #31
    McDaver63's Avatar
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    Feb 2012
    Location
    Lincoln, CA
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    191
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    Default Re: That Pesky Fabric Drumming Wing Root.

    59pacer, OK Thanks for your description of your foam fix. I will consider doing that. I did experiment with placing a section of foam about 5/8" thick between the aft spar and the fabric fwd of the inspection plate. Took up for a test flight and it did reduce the drumming at the inspection plate area quite a bit. Still could see the drumming fwd of the spar but it also seemed reduced.
    Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute

  2. #32
    cjutzi's Avatar
    Join Date
    Jun 2012
    Location
    Lake Oswego, OR
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    58
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    Default Re: That Pesky Fabric Drumming Wing Root.

    for me, I glued some felt along the spar to close the gap between the fabric and the rib. This kept the fabric from bouncing on climb and I have had no issues for 2 years so far..

  3. #33

    Join Date
    Mar 2016
    Location
    Merritt Island, FL
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    Default Re: That Pesky Fabric Drumming Wing Root.

    Had to repair the wing root butt rib - right side during annual on my Tri-pacer this year. To do so I had to remove fabric just forward of the right side flap along with the aluminum sheet metal between the tank cover and the trailing edge. I noted that the inside of the wing in the area under the wing root fairing that there were large 3” x 5” inspection holes cut to allow access or to view control cables, gas tank fuel level sender, and fuel lines. These inspection windows left the fabric in the immediate area on the bottom surface of the wing loose. When it was time to close up the wing I laid extra patch material on the inside of the wing root to cover those holes and it has tightened up the whole underside of the wing fabric in that area. I had previously placed a large 12 x 16” patch over the two inspection port holes on the underside with new plastic rings. I have done no other modifications such as foam or Steve’s aluminum reinforcement in this area. I won’t know until I fly if there’s an improvement but just my hand thumping-drumming test suggests that it is much more taught in that area now. Still in work but should be in the air in a couple of weeks and will update on my success or not with this patch to reduce drumming.

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