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Firewall penetration

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Don Owens

Joined: 17 Jan 2006
Posts: 24
Location: North Central Washington

Posted: Fri Dec 08, 2006 12:24 pm Post subject: Firewall penetration

I have the need to bring several bundles of wire through my RV-7 firewall.  I have some of the two-piece, stainless, firewall shields, but can't help but think there is a better way.  Any great ideas out there  



Thanks,

Don Owens

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aerobubba(at)earthlink.ne
Guest

Posted: Sat Dec 09, 2006 4:49 am Post subject: Firewall penetration

Hi Don



 	  Quote: 	
		   I have the need to bring several bundles of wire through my RV-7

firewall. 
	


 	  Quote: 	
		   I have some of the two-piece, stainless, firewall shields, but can't help 

 but think there is a better way. Any great ideas out there [Question]


	


I used Bob's stainless grab bar idea, and really like it.  Search the

archives, look at

http://aeroelectric.com/articles/Firewall_Penetration/firewall.html , and

consider using the cut off ends of a handicapped shower grab bar.  I think

I paid $14 or $17 for the shortest one I could find, which of course

yielded up 2 penetration fittings.  One is big enough to handle 3 heavy

engine / prop control cables, 2 bowdens, the MP line, a #2 battery cable,

and the power feed from the alternator.  The other one on the other side of

the fire wall has all the sensor lines.  I'm quite happy with the way it

has turned out-



glen matejcek

aerobubba(at)earthlink.net

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Don Owens

Joined: 17 Jan 2006
Posts: 24
Location: North Central Washington

Posted: Sat Dec 09, 2006 10:21 am Post subject: Re: Firewall penetration

Thanks Glen - That's perfect - just what I was looking for.  



Don Owens

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cleone(at)rr1.net
Guest

Posted: Tue Dec 12, 2006 10:42 am Post subject: Firewall penetration

I saw Bob's idea and may adopt some of that, but then I think about 

the rather large holes for the rudder bars to the nose wheel steering 

and I'm stumped.  My plane is a Zenith Zodiac and it looks impossible 

to keep a fuel fed fire from blasting right in.  Not a pleasant thought.

Cleone



At 12:21 PM 12/9/2006, you wrote:

 	  Quote: 	
		  



Thanks Glen - That's perfect - just what I was looking for.  



Don Owens





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=80409#80409

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Gilles.Thesee(at)ac-greno
Guest

Posted: Tue Dec 12, 2006 11:02 am Post subject: Firewall penetration

 	  Quote: 	
		  

 I saw Bob's idea and may adopt some of that, but then I think about 

 the rather large holes for the rudder bars to the nose wheel steering 

 and I'm stumped.  My plane is a Zenith Zodiac and it looks impossible 

 to keep a fuel fed fire from blasting right in.  Not a pleasant thought.

Older airplanes with such big rods did with sliding covers riding on the 
	


rods and sliding against the FWL, or resorted to non-fire "socks", made 

of leather for instance. This way movement is allowed without letting 

gas or flame pass.

Why not have a try ? We have a Zenith in the hangar, and indeed the 

firewall is as gas tight as a sieve...And once we even found the bars 

buckled.

For variation on Bob's theme and suitable putty, I gathered some info here :

http://contrails.free.fr/engine_cpf.php



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

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frank.hinde(at)hp.com
Guest

Posted: Tue Dec 12, 2006 11:04 am Post subject: Firewall penetration

On the Zodiac you have two areas like that.



One is the nose wheel rods the other is the throttle rod penetrations,

Neither of them are easy to seal.



Frank

Zodiac 400 hours

RV7a 52hours 



--

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