REFLECTOR: Plenum-Runner-firewall connections

[Ron Brown]

The baffle wrap is to allow some movement of the engine (and it will move, 
especially during start up and shut down) in relation to the NACA/duct.  I 
left about a 1/2" gap between the two runners, then the baffle wrap closes 
all of this up.  Mine requires that both ends of the duct to be unscrewed to 
remove them.

Hope that helps.
Ronnie



----- Original Message ----- 
From: "Jeffrey Clough" <jclough at gci.net>
To: <reflector at awpi.com>
Sent: Saturday, August 12, 2006 1:56 PM
Subject: REFLECTOR: Plenum-Runner-firewall connections


>I am beginning the fabrication of my plenum to NACA runners....I looked
> at the online construction pics......it looks like the plenum is screwed
> into the firewall via a flange at the NACA ducts and at the other end it
> is screwed into the plenum via a flange......in the MIDDLE of the
> runners is a joint of what appears to be engine baffle wrapped around
> and pop riveted to the lower runner section.....does the upper runner
> section just 'fit like a glove' into this baffle wrap?  Is this the best
> way to do this?  Is it easy to disassemble...to remove the plenum...with
> this method?  Does this isolate the engine vibrations from the
> runner-NACA junction?  Does the upper runner section still insert into
> the lower section an inch or two or do they approximately 'butt' inside
> the baffle wrap??   Thanx for your help!
> Jeff Clough    173 RG Clamshell Franklin
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