From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Electrical System Planning
To: lml
Date: Fri, 11 Jul 2003 17:50:30 -0400
Message-ID: <web-2472321@logan.com>
In-Reply-To: <20030711203057.60994.qmail@web11308.mail.yahoo.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"; format="flowed"
Content-Transfer-Encoding: 8bit

Posted for Scott Richardson <scott_m_richardson@yahoo.com>:

Hi Paul,

Absolutely agree.  My thinking was to keep any firewall penetration 
outside of the area where the firewall gusset layups contact the
firewall itself.  The only exception I've found so far is for the
throttle/mixture/carb ht controls that run next to the nose gear
tunnel and through the inboard layups on the pax-side lower engine 
mount.  The wiring hole(s) would then be inboard of the gussets
allowing me to run the cables along the fuselage sides from the
panel to the firewall.  I've seen some builder pictures where the
main starter/ground cable penetrates the firewall near the top
of the nose gear tunnel - just not sure where it goes next.  How
they get from the center of the firewall to the starter without
alot of snaking on the firewall to get to an engine mount strut or
a "free-air" jump from the firewall to the engine itself.

Scott


> I'm not an engineer, but wouldn't that tend to weaken the structure
> of the firewall in an area where fairly heavy loads are being 
> transfered?