Motor Mounts

[Rcmaster199 at aol.com]

As long as you use aircraft ply, 1/8" thick is plenty thick enough for even 
large firewalls such as Giles for example. Use the Hyde type mount without fear 
of firewall breakdown or excess flex. If you are really concerned, increase 
to 3/16", but in my experience it isn't necessary. And a carbon reinforcement 
is really overkill, but it doesn't hurt anything. 

BTW, should you decide to reinforce with carbon cloth or mat, adding it to 
the one side only will not help that much. Its far more effective to add it to 
boh sides. FWIW

Matt K


> Subj:Re: Motor Mounts 
> Date:1/2/2004 9:19:55 AM Eastern Standard Time
> From:anthonyr105 at hotmail.com
> Reply-to:discussion at nsrca.org
> To:discussion at nsrca.org
> Sent from the Internet 
> 
> 
> 
> The firewall on the Focus is tremendous. I actually drilled lightening holes 
> 
> in mine. The question is more relevant in a typical glass fuse with an 1/8" 
> firewall type of deal many are using with a nose ring. In this situation 
> would you strengthen the firewall to use an A mount?
> 
> 
> 
> 
> 
> 
> 
> 
> From: "Bill Pritchett" <phelps15 at comcast.net>
> >Reply-To: discussion at nsrca.org
> >To: <discussion at nsrca.org>
> >Subject: Re: Motor Mounts
> >Date: Fri, 2 Jan 2004 09:03:41 -0500
> >
> >Ed:
> >I operate mine on a Focus which has the removable cowling that you 
> >describe.  I haven't noticed any problem with the firewall.  You are 
> >correct in describing the installation of a nose ring as a "complicated 
> >affair".
> >Bill
> >   ----- Original Message -----
> >   From: Ed Miller
> >   To: discussion at nsrca.org
> >   Sent: Friday, January 02, 2004 8:40 AM
> >   Subject: Motor Mounts
> >
> >
> >   Has there been any changes to the Hyde "A" mount recently ?? The one I 
> >weighed was 6 ounces not including firewall mounting or engine mounting 
> >screws. Seems to me a stiffer/heavier firewall would also need to be used 
> >with the A mount as not only is the engine and mount weight hanging off it 
> >but the twisting and shaking motion is bared solely by the firewall. Guess 
> >it would require a carbon fiber firewall, especially on a large frontal 
> >area plane so as to eliminate any flexing of the firewall.  A typical soft 
> >mount with nose ring setup actually uses the fuse from the firewall forward 
> 
> >as part of the "stressed mounting member" and I know I can do a 
> >Rotomount/Nose ring with all hardware and mounting points for under 3.5 
> >ounces and have adjustability. Seems the biggest advantage of the A mount 
> >is ease of installation and installation in a plane with a removable cowl 
> >where installing a nose ring can be a complicated affair.
> >   Ed M.

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