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09-23-2015, 09:42 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by wirejock
I see Proseal used between the skin and firewall flange. Why?
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Some builders like a sealant there. Has nothing to do with fire protection.
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Dan Horton
RV-8 SS
Barrett IO-390
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09-23-2015, 11:55 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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If stainless is the best firewall, would there be a reason to use a layer of stainless over the fiberfrax rather than foil? How about natural cork?
I am building a 9A. I have a light battery and a fixed pitch Catto. The front end of my plane is light and I believe I will have to put a crush plate to get the CG where I want. The firewall isnt as far forward as the crush plate, but maybe the weight of a second layer of stainless wouldn't be that much of a penalty.
Any thoughts? I will be re-installing my engine next week and still trying to figure out the best options.
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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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09-24-2015, 11:06 AM
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Join Date: Sep 2007
Location: BC
Posts: 1,674
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Quote:
Originally Posted by wirejock
I see Proseal used between the skin and firewall flange. Why?
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The cowl area can be pressurised slightly with reference to the cockpit. Therefore any smells, fumes, or smoke from the engine area may be forced into the cockpit under certain circumstances.
Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
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09-24-2015, 12:15 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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I think Dan recommends stainless foil.
Dave
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09-24-2015, 12:51 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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Right on the foil. Just wondering if it would be easier to clean and maintain if it was a sheet.
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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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09-24-2015, 01:15 PM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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Quote:
Originally Posted by rockwoodrv9
Right on the foil. Just wondering if it would be easier to clean and maintain if it was a sheet.
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Weight would be the primary reason to use foil with its primary purpose, based on DanH posts, is to hold the fiberfrax in place so it can do its job insulating. If weight were not a concern, thicker should, in theory, be better.
my .20 (inflation).
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Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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09-24-2015, 01:54 PM
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Join Date: May 2013
Location: Milano Italy
Posts: 78
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firewall insulation
here how I did last year after read tons of threads , finally I followed the Dan way.
Thanks Dan

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Lucio
Milano Italy
Blue-7
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09-24-2015, 03:28 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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Thanks for the picture Lucio. My daughter is in Italy now on vacation!
Quote:
Originally Posted by Lucio I-NLCM
here how I did last year after read tons of threads , finally I followed the Dan way.
Thanks Dan

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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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09-25-2015, 07:30 AM
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Join Date: May 2013
Location: Milano Italy
Posts: 78
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Rockwood
Good choice Italy for vacation, I hope you daughter plans, after all, one day to visit the expo in Milano.
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Lucio
Milano Italy
Blue-7
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09-25-2015, 08:26 AM
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Join Date: Nov 2010
Location: Okanagan Valley BC, Canada
Posts: 483
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Another way, 1/8 fiberfrax with .015 stainless (forward of the main firewall). Needed weight forward anyways and wanted something more robust than foil.... Forward stainless sheet is not sealed around the perimeter to allow off gassing of the fiberfrax in case of fire.

__________________
Ron Townson
Okanagan Valley BC, Canada
RV-8 Completed Dec 2013
Membership renewed Sept 8, 2019
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