Firewall for Hyde Mount

Wed Sep 10 00:59:10 AKDT 2003

Dave

I have fitted a carbon/end grain balsa firewall in my Smaragd and it is
VERY stiff/strong.  At 7mm thick, I'm sure it's much more than is
required for this model considering I'll be using a nose ring but I am
sure it wouldn't flex using your proposed set-up.  This is a very
different material to carbon/nomex where I would be concerned about the
carbon skins delaminating from the nomex over time due to the small
surface area at the interface between the two materials.  Also, the end
grain balsa is less likely crush when you tighten up the screws.

I can't speak for the Carbon/end grain balsa available where you are of
course.

Kind Regards
Alan

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Dave Smith
Sent: 09 September 2003 14:12
To: discussion at nsrca.org
Subject: Re: Firewall for Hyde Mount

The airplane is a G-202 from Gator plans. With removable front
end,nothing suitable to attach an in- fuselage nose ring to. Yes,it
could be attached to the removable cowl,but not a good idea. Using
aircraft grade ply would require at least 3/16th,maybe even 1/4 thick
firewall.   I doubt 1/8th would be stiff enough by itself.

Suitably braced the Nomex will be stiff enough and lighter than either
3/16th or1/4 aircraft ply would be with the AR mount.

Dave

----- Original Message -----
From: "Troy Newman" <troy_newman at msn.com>
To: <discussion at nsrca.org>
Sent: Tuesday, September 09, 2003 1:13 AM
Subject: Re: Firewall for Hyde Mount

>
> 1/4" nomex alone is not sufficient either. I tried this on my original

> Smaragd
>
> Use the AR (A) its the lightweight AR mount and stick the nose ring in

> the fuse it so much lighter and easier to do......
>
> The ARI works great in a Focus type model with no nose and only a 
> cowling....
>
> The best and lightest setup is the AR (A) and a fuse mounted nose 
> ring....
>
> As ffor beefing up the CF nomex firewall with metal or ply 
> strips...why
are
> you using a Nomex CF firewall...weight right? Well if weight is the 
> issue why add it in the form of the ARI mount and the beefy firewall 
> to support it.
>
> Your defeating the purpose of using a $20 chunck of composite material

> for the firewall....and then top that off with the fact you're going 
> to spend
an
> extra $40-50 on a motor mount that in the end gives a setup that is
heavier
> than just doing it right to begin with
>
> Don't get me wrong the ARI is a good mount...but require a stiff 
> firewall....Are you going to save an oz in the material you use just 
> to
add
> another 1.5-2ozs back into it just to say you have a cool CF-Nomex 
> firewall...its not doing anything for you. The Ar style mounts work
perfect
> on the cf-nomex firewall....I use 1/8th" Aircraft grade firewalls in 
> most
of
> my models and venture out into the CF-Nomex ones at times.....
>
> My personal opinion, your milage may vary
>
> TN
>
>
> >From: "Dave Smith" <dfs at navnet.net>
> >Reply-To: discussion at nsrca.org
> >To: <discussion at nsrca.org>
> >Subject: Re: Firewall for Hyde Mount
> >Date: Mon, 8 Sep 2003 09:41:56 -0300
> >
> >Will 1/4"  Nomex be satisfactory as a firewall with this mount?   If
> >not,could it be re-enforced with aluminum or plywood strips across 
> >the
back
> >and be O.K?
> >
> >Dave
> >
> >----- Original Message -----
> >From: "Troy Newman" <troy_newman at msn.com>
> >To: <discussion at nsrca.org>
> >Sent: Monday, September 08, 2003 1:36 AM
> >Subject: Re: Firewall for Hyde Mount
> >
> >
> > > Nope!
> > >
> > > Been there and tried that with the ARI mount.....need a min of 
> > > about
> >1/4"
> > > Aircraft grade ply for the ARI mount....1/4" CF end Grain will 
> > > hold it
> >in
> > > place but the firewall will flex and change the thrust ine in 
> > > pulls
and
> > > pushes. Over time it will start to flex more and more. I found
> >out....and
> > > replaced the mount with a nose ring in the fuse style....on that 
> > > model anyway.
> > >
> > > This is enough structurally to hold the mount...but no where near
stiff
> > > enough to keep things lined up properly.
> > >
> > > TN
> > >
> > >
> > > >From: "Reeves" <reeves at mtaonline.net>
> > > >Reply-To: discussion at nsrca.org
> > > >To: <discussion at nsrca.org>
> > > >Subject: Firewall for Hyde Mount
> > > >Date: Sun, 7 Sep 2003 01:46:23 -0800
> > > >
> > > >Hi, I plan to install a Hyde ARI (A) mount in a new Synergy I am
> >building.
> > > >This is the mount with the nose ring incorporated on an aluminum
yoke.
> >I
> > > >was going to use carbon fiber end grain balsa composite 1/4" 
> > > >thick
for
> >the
> > > >firewall material. Is this material stiff enough? Anyone else 
> > > >using
> >this
> > > >setup with success? Thanks, Reeves in Alaska.
> > >
> > > _________________________________________________________________
> > > Use custom emotions -- try MSN Messenger 6.0! 
> > > http://www.msnmessenger-download.com/tracking/reach_emoticon
> > >
> > > =====================================
> > > # To be removed from this list, send a message to
> > > # discussion-request at nsrca.org
> > > # and put leave discussion on the first line of the body. #
> > >
> > >
> >
> >=====================================
> ># To be removed from this list, send a message to
> ># discussion-request at nsrca.org
> ># and put leave discussion on the first line of the body.
> >#
> >
>
> _________________________________________________________________
> Compare Cable, DSL or Satellite plans: As low as $29.95.
> https://broadband.msn.com
>
> =====================================
> # To be removed from this list, send a message to
> # discussion-request at nsrca.org
> # and put leave discussion on the first line of the body.
> #
>
>

=====================================
# To be removed from this list, send a message to 
# discussion-request at nsrca.org
# and put leave discussion on the first line of the body.
#

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.507 / Virus Database: 304 - Release Date: 04/08/2003

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.507 / Virus Database: 304 - Release Date: 04/08/2003

=====================================
# To be removed from this list, send a message to 
# discussion-request at nsrca.org
# and put leave discussion on the first line of the body.
#