[NSRCA-discussion] wing tube sleeve hole

Sat Nov 10 07:38:56 AKST 2007

Nat,

First you have to cut a slot thru the foam core at the end of were the tube
will be. This will serve also as the pocket for the ply tube support. The
slot
size is 3/4" x 2 1/2". All pockets required are cut before the actual wing
core
itself is cut. I trim up all my foam blocks to the same size before starting
to
cut the actual core itself. Make yourself a new cutting-bow out of a piece
of
1" x 2" wood and drill holes for the legs (5/32 dia. music wire or 2 old
main lg's.)
Insert these thru the outward pointing holes right up to the coil. Cut to
length
about 5" below coil. You can solder your wire for the current right to the
coil.
Now here is the part that takes a little more work.
File or grind small hook shapes at the end of the legs. Make up a cutting
wire
that is when finished about 2" shorter than the distance between the two
legs.
Bend small loops in the cutting wire on both ends. These will hook onto the
small hooks on the legs.
First burn the starter hole with heated 5/32 wire and than insert the
cutting wire
thru this and hook onto the legs of the bow. The coils in the music wire
(gear legs)
will give you the tension required since the cutting wire is about 2"
shorter
then the uncompressed ends of the legs.
I have been trying to get some pic's attached, but they are too big in size
to get to the list so I will try to send those direct to you.
Hope this helps.

Karl G. Mueller
kgamueller at rogers.com

  ----- Original Message ----- 
  From: Nat Penton
  To: NSRCA Mailing List
  Sent: Friday, November 09, 2007 7:21 PM
  Subject: Re: [NSRCA-discussion] wing tube sleeve hole

  Karl
  At the outboard template position I am having difficulty understanding how
there is room for the cutting bow to work. What am I not seeing.
Thanks      Nat
    ----- 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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