[NSRCA-discussion] Composite Firewalls

[Budd Engineering]

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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>
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