cf tubes

[Lance Van Nostrand]

I haven't seen this method, but John's described it before.  could be a great way to go.  Since the CF cannot be tapped I am less imaginative than John.  I use a scrap of 1/4 lite ply sanded to a roundish shape so that it can fit inside the tube.  I drill this and tap it, or put in a blind nut.  Then, after driling through the wing and into the tube, I remove the tube from the wing and then use the hole to line up my lite ply threads with a 4-40
--Lance

  ----- Original Message ----- 
  From: John Ferrell 
  To: discussion at nsrca.org 
  Sent: Saturday, June 26, 2004 10:31 AM
  Subject: Re: cf tubes


  I prefer the PVC alternative.
  1- Slice a ring (about 1/4 inch) from a slightly oversized piece of PVC tubing.
   2- cut a segment out of the ring (about 1/4 or 3/8 inch) so that you can compress it a little and slide it inside the tube. 
   3- drill a little undersize, sharpen a screw to make it self tapping. 

  Cheap, easy to replace, field repairable (rotate the ring & re-tap). Also, the PVC does not seem to allow a loose screw to come out. 

  John Ferrell    
  http://DixieNC.US

    ----- Original Message ----- 
    From: Ed Deaver 
    To: NSRCA Disscussion 
    Sent: Saturday, June 26, 2004 5:32 AM
    Subject: cf tubes


    To save weight, I am switching to the PBG CF wing and stab tube.  In this plane I already have a 4*40 bolt in the wing and stab as my fastening method.

    Can you drill and tap these tubes successfully wicked with thin CA after tapping?  Realize the stab tube will only be taken off rarely.  One of the wing bolts will be removed on a regular basis.

    Or, do I have to glue a piece of ply to the inside of the tubes and tap that?

    Before it comes up, I do not want to change my mounting system unless it absolutely needed.

    Thanx in advance.

    ed
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