[NSRCA-discussion] wing tube sleeve hole

[Lance Van Nostrand]

Thanks Karl, this is a good idea.  It produces a hole that looks very clean.  My concern is how to get the template end that is inserted into the wing into the precise location.  I didn't used to be too concerned with this.  As long as the holes in the opposing wings were close they were good enough because when I mount the wing tube in the fuse I would perfectly align the wings.  Even if the wing tube was tilted, it would not matter.  However, now that we sell kits and people order replacement wings, or use the wing tube itself to align with the stab, I feel I must have a method that is repeatable to a very accurate degree.  Also, another difference from the home builder to the production shop is time.  Your method looks like it would be quick to do, but not as sure about the setup (having to burn the initial hole and feed the wire).  I'm sure that with practice any method becomes efficient.

--Lance

  ----- Original Message ----- 
  From: Karl G. Mueller 
  To: NSRCA Mailing List 
  Sent: Friday, November 09, 2007 10:03 AM
  Subject: Re: [NSRCA-discussion] wing tube sleeve hole


  Lance, 

  I have cut the holes for  the wing tube socket with a hot wire
  and two templates mounted to the work bench at the proper
  height to be on center of where the tube hole should be.
  The socket hole is cut before cutting the core itself.
  You need to make a slot in the core where the end support of the 
  tube is going to be to insert the template that is mounted to the bench.
  I then burn a small hole thru the center of the templates in the
  core with a hot piece of music wire held in a small machine vice
  that is guided along a straight edge. Then I thread the wire for the
  cutting bow thru that hole and start cutting following the two
  templates. Start with a low heat and try the fit. If the fit is too tight
  just increase the voltage a little and go around the templates again
  until you achieve the proper fit. Of course you need a variable power
  supply. Sounds more complicated than it really is. Now when you 
  cut the core, adjust your tip template to get the proper dihedral. Works
  for me.

  Karl G. Mueller
  kgamueller at rogers.com

    ----- Original Message ----- 
    From: Lance Van Nostrand 
    To: NSRCA Mailing List 
    Sent: Thursday, November 08, 2007 10:46 PM
    Subject: Re: [NSRCA-discussion] wing tube sleeve hole


    That's a hard one, Mike.  Both Terry and I use a similar method.  We had a machine shop make a jig for the cutter.  The cutter is a length of 7/8" wing tube with  a ground sharp edge, but the jig to hold it has got to be made presicely.  I used to use a seemingly accurate jig made to the plans provided in a KFactor several years ago, but my results were not good enough.  
    --Lance

      ----- Original Message ----- 
      From: Mike Miller 
      To: nsrca-discussion at lists.nsrca.org 
      Sent: Thursday, November 08, 2007 7:08 PM
      Subject: [NSRCA-discussion] wing tube sleeve hole



      http://www.mackrc.net/patternwings2/index.htm

      http://www.nextcraft.com/foamwingsandparts.html

      Terry Brox's web site on balsa skinned wings is very good and does show the drilling of the servo lead hole with a tube and by hand. 

      Their is some great information on these sites on building foam core wings. But a very important part of a plug in wing would be the wing tube sleeve hole in the core, to be straight and parallel to the desired line centered and at the right angle to set the dihedral. Is there a site that explains or shows the process of set up and drilling of this hole? If this step is not perfect looks to me like the wing is dead no matter how good the skinning process is.
      Thanks in advance

      Mike


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