[NSRCA-discussion] Composite Firewalls

[Wayne Galligan]

Use 4x4 block balsa and cut it with a chop saw or compound miter saw... if you have one.  Lone Star Balsa also carries it.

Wayne Galligan
Skyblazers R/C Club
Waxahachie Texas
  ----- Original Message ----- 
  From: Budd Engineering 
  To: General pattern discussion 
  Sent: Wednesday, April 14, 2010 12:18 AM
  Subject: Re: [NSRCA-discussion] Composite Firewalls


  Just curious, where do you guys get the end grain balsa?  I can't imagine you're cutting your own?


  Thx, Jerry

  Sent from my iPhone

  On Apr 13, 2010, at 11:46 PM, "Wayne Galligan" <wcgalligan at att.net> wrote:


    I'll  ditto Bob's response on the 1/64 over 1/4" endgrain.  More surface area there to glue to fuse. I use a lt. ply ring behind the soft mount to hold the blind nuts. Works....gerrrrrrrr... ate!

    Wayne Galligan
    Skyblazers R/C Club
    Waxahachie Texas
      ----- Original Message ----- 
      From: Bob Kane 
      To: General pattern discussion 
      Sent: Tuesday, April 13, 2010 9:29 AM
      Subject: Re: [NSRCA-discussion] Composite Firewalls


            I have had very good results with a firewall made of 1/64" plywood laminated on both sides of 1/4" end-grain balsa using polyurethane glue.  Lightly spray water on the balsa, smear the poly glue on the balsa and a light, even coat of glue on the plywood. Press everything together, lay a sheet of wax paper on a flat surface, set the firewall on the paper, cover with another sheet of wax paper, and stack a LOT of books on top. The poly glue will foam and penetrate the plywood, the weight is necessary to keep the plywood from being pushed away from the balsa by the foaming glue.  The resulting structure is very light, very strong, and offers a wide gluing surface inside the fuselage.

            My setup uses a Hyde mount, so I glued 3/32" plywood disks approximately 3/4" diameter to hold the blind nuts on the backside of the fire wall.  Nothing is needed on the front, the Hyde mount has a large back surface to spread the load.

            I have been flying this in my YS160DZ powered Temptation for 4 seasons now without any problems.

            Bob Kane
            getterflash at yahoo.com

            --- On Tue, 4/13/10, colin chariandy <cchariandy at yahoo.ca> wrote:


              From: colin chariandy <cchariandy at yahoo.ca>
              Subject: [NSRCA-discussion] Composite Firewalls
              To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
              Date: Tuesday, April 13, 2010, 9:57 AM


                    Can anyone advise me on the appropriate composite panel size and material for Glow powered firewalls? My Xigris came with 1/8 ply that I'd like to replace. 

                    Colin. 




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