Announcement

Collapse
No announcement yet.

BC12 wing main spar

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • BC12 wing main spar

    Hi
    We have 4 wings for our BC12 restoration and are trying to make 2 good ones from the wings we have.

    However - On 2 of the wings the ribs have been attached to the spar with what looks like woodscrews?

    Was this ever an option or is it a result of a botched restoration attempt?

    BR Ian

  • #2
    Seen a lot of strange stuff but never screw holding ribs to wing spars!

    Comment


    • #3
      Originally posted by taylorukuk View Post
      Hi
      We have 4 wings for our BC12 restoration and are trying to make 2 good ones from the wings we have.

      However - On 2 of the wings the ribs have been attached to the spar with what looks like woodscrews?

      Was this ever an option or is it a result of a botched restoration attempt?

      BR Ian
      They do something similar on Aeroncas. There is an STC to use small #4 sheet metal screws instead of nails that back out .

      Dave R

      Comment


      • #4
        The STC for screws is SA02295SE (https://rgl.faa.gov/Regulatory_and_G...t=%20sa02295se), is held by Rainbow Flying Service of Moses Lake, Washington (https://rainbowflying.com), and also covers Taylorcrafts.

        Comment


        • #5
          Excellent find re the alternative means of rib attachment to wood spars! Good to have available. https://rainbowflying.com/shop?olsPa...ews-stc&page=1

          Gary
          Last edited by PA1195; 6 days ago.
          N36007 1941 BF12-65 STC'd as BC12D-4-85

          Comment


          • #6
            Originally posted by MBednarek View Post
            The STC for screws is SA02295SE (https://rgl.faa.gov/Regulatory_and_G...t=%20sa02295se), is held by Rainbow Flying Service of Moses Lake, Washington (https://rainbowflying.com), and also covers Taylorcrafts.
            I had not realized that Ron's STC covered T-Crafts also thanks!

            J2 thru J4 too!

            Dave R

            Comment


            • #7
              Originally posted by PA1195 View Post
              Excellent find re the alternative means of rib attachment to wood spars! Good to have available. https://rainbowflying.com/shop?olsPa...ews-stc&page=1

              Gary
              Not really Gary, the damage the shit out of the spars.
              N29787
              '41 BC12-65

              Comment


              • #8
                Originally posted by astjp2 View Post

                Not really Gary, the damage the shit out of the spars.
                Substantiate.

                Gary
                N36007 1941 BF12-65 STC'd as BC12D-4-85

                Comment


                • #9
                  I would think the little screws would not harm the spar. Nails do not always stay put . Interesting dialog

                  Comment


                  • #10
                    I have never found a big issue with nails backing out of ribs on a t-craft, and I have taken dozens of wings apart. I found more with the head rusted off that backed out.

                    Comment


                    • #11
                      Scews break the fibers, a Brad will split them
                      N29787
                      '41 BC12-65

                      Comment


                      • #12
                        Dr. Tim I can see what you're saying about the potential shearing of wood fibers with screws. Bellanca used small ring nails at one time but even they were prone to backing out and an AD followed. I think they reused the nails with maybe some wood glue. A call to Rainbow Flying Service the screw STC holder might be worth the time to get their basis for the STC. Surely any potential for strength reduction or damage has been addressed through testing.

                        Gary
                        N36007 1941 BF12-65 STC'd as BC12D-4-85

                        Comment


                        • #13
                          I have a hard time drilling bolt holes! Just because of the possible damage to the grain
                          N29787
                          '41 BC12-65

                          Comment


                          • #14
                            Oh and the Bellanca had smooth nails that came out, the put the ring shanks to stop it from backing out
                            N29787
                            '41 BC12-65

                            Comment


                            • #15
                              Thanks Tim for the correction on the Bellanca nail history. I had it done on my 7GCBC in a few spots. Tapped some back in or replaced with ring nails. Dry climate and spar flex were the cause I was told. Grabbing and shaking the wingtips up and down will make a doubter out of new pilots.

                              Gary
                              N36007 1941 BF12-65 STC'd as BC12D-4-85

                              Comment

                              Working...
                              X