[NSRCA-discussion] Composite Firewalls

[Keith Hoard]

I outsource all of my endgrain balsa cutting, gluing, and bagging to the
folks at CST composites. . . they do a fine job. . .

On Wed, Apr 14, 2010 at 8:43 AM, <rcmaster199 at aol.com> wrote:

> 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<lt%3Bwcgalligan 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<lt%3Bcchariandy at yahoo.ca>&gt;
> wrote:
>
> From:           colin chariandy &lt;cchariandy at yahoo.ca<lt%3Bcchariandy at yahoo.ca>
> &gt;
>
> Subject:           [NSRCA-discussion] Composite Firewalls
> To: "NSRCA Mailing List"           &lt;nsrca-discussion at lists.nsrca.org<lt%3Bnsrca-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.
>
>
>          Yahoo!           Canada Toolbar : Search from anywhere on
>   the web and bookmark your favourite sites. Download it now!
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-- 

Keith Hoard
Collierville, TN
khoard at gmail.com
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