foam core question

[Nat Penton]

Mark I did not use support at the end of the wing tube because the cores came to me sheeted. In this case I let the socket go into the panel 18" and the tube almost 16". I have about 700 flights with no problems. If I did have a problem it would be easy to remove a precise amount of foam and replace with a light weight filler ( SuperFill ). Forget about carbon strips and use .5oz carbon mat to apply the epoxy to. It will be lighter by helping controll the amount of adhesive and, most important, provide a torsionally very stiff wing and aileron.        Regards   Nat
  ----- Original Message ----- 
  From: Mark Hunt 
  To: discussion at nsrca.org 
  Sent: Thursday, April 15, 2004 9:16 PM
  Subject: foam core question


  Sirs:

  As a newbie to cutting foam cores, I have a question regarding how to strengthen the wing panel.  Does the preferred method include attaching some c.f. strips to the inside of the skins?  Should they extend from the root all the way to the tip?  I know some guys feel it is a must to also use a false rib near the end of the tube sleeve also?  I hear that some guys (r u out there Nat?) are confident without any false rib or c.f. under the skin....?

  I cut the cores earlier tonight (to rebuild my 2M after a mid-air) with the help of a friend, and they turned out just beautiful.  I have a nice plan to machine a drill jig for cutting the spar tube hole...so that's seems to be solved.

  Thanks in advance for the help...


  Mark
  www.geocities.com/markhunt_2000/INSIGHT

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