[NSRCA-discussion] Composite Firewalls

[rcmaster199 at aol.com]

I cut my own end grain balsa....6 pound density blocks cut easily and 
straight. I use epoxy and 3K carbon cloth as I've described before. I 
vacuum bag the assembly using a Food Saver system. Once you vacuum bag, 
you'll never go back

MattK

-----Original Message-----
From: Budd Engineering <jerry at buddengineering.com>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Wed, Apr 14, 2010 1:18 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" 
&lt;wcgalligan at att.net&gt; 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 
&lt;cchariandy at yahoo.ca&gt; wrote:

From:           colin chariandy &lt;cchariandy at yahoo.ca&gt;
Subject:           [NSRCA-discussion] Composite Firewalls
To: "NSRCA Mailing List"           
&lt;nsrca-discussion at lists.nsrca.org&gt;
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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