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Corvair firewall

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naumuk(at)alltel.net
Guest

Posted: Tue Apr 10, 2007 4:09 pm Post subject: Corvair firewall

Corvair people-

     Anyone have the layout for  attaching a Corvair mount to an HDS firewall? According to WW, they're the same  for XL/HDS. I'm more interested in where to position the cross members at  this stage in the game.

     Yes, I'm getting lazy. More like  I'm worn out from trying to keep from making a major mistake the past couple of  weeks.

      Thanks.

 Bill Naumuk

HDS Fuse/Corvair

Townville,  Pa

   [quote][b]

Jaybannist(at)cs.com
Guest

Posted: Tue Apr 10, 2007 6:42 pm Post subject: Corvair firewall

Bill,

 I discovered that the dimensions given in the drawings for the location of the attach bolts is not very accurate.  It is best to locate them with the attach brackets that are behind the firewall and attached to longerons.  It would be best to drill pilot holes in the center of the face of the brackets, locate the brackets, then drill the holes in the firewall.  

 

 Jay in Dallas     [quote][b]

Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Wed Apr 11, 2007 7:57 am Post subject: Re: Corvair firewall

This is what I did and when I got WW's engine mount it went on without a problem.

 	  Jaybannist(at)cs.com wrote: 	
		  Bill,

 I discovered that the dimensions given in the drawings for the location of the attach bolts is not very accurate.  It is best to locate them with the attach brackets that are behind the firewall and attached to longerons.ï¿½ It would be best to drill pilot holes in the center of the face of the brackets, locate the brackets, then drill the holes in the firewall.  

 

 Jay in Dallas    [b]

_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

naumuk(at)alltel.net
Guest

Posted: Wed Apr 11, 2007 2:42 pm Post subject: Corvair firewall

Jay and everyone-    

     I'm not interested in exact hole  locations at this point. My firewall is laying on the bench. My  crossmembers, etc. are primed and ready to install. What I want to know is,  where do I locate my crossmembers so I can be sure of having correct edge  distance, etc., when drilling the Corvair engine mount bolt holes? Am I OK with  going with the Zenith layout, which is designed with a Rotax in mind  or do I have to do something different? 

 Bill Naumuk

HDS Fuse/Corvair

Townville, Pa

 [quote]   ---

btucke73(at)yahoo.com
Guest

Posted: Wed Apr 11, 2007 7:08 pm Post subject: Corvair firewall

Bill,



     If what you mean by braces are the mounting bolts

tack welded to the 4130 mounts that are bolted to the

upper and lower longerons, drill away.  I attached

WW's engine mount directly to my firewall bolts with

no placement issues.  Make sure that you do not have

the Rotax engine mount firewall bolts.  These bolts

are too short.  You will have to grind the tacks off,

remove them, and tack longer bolts in their place.  I

can't remember the size, but maybe somebody else will

chime in...  



I hope I read the question correctly...



VR/



Brandon

601HDS / TD / Corvair

80 hours

http://mcgirt.net/~ars2006/ars2006/Desktop.html

       

Bored stiff? Loosen up... 

Download and play hundreds of games for free on Yahoo! Games.

http://games.yahoo.com/games/front

craig(at)craigandjean.com
Guest

Posted: Wed Apr 11, 2007 8:18 pm Post subject: Corvair firewall

Although my plans don't show it the engine mount fittings (6B6-4 and 5) come

from the factory in two forms: one with short bolts welded to the brackets

for the Rotax, Jabiru, Continental and conical Lycoming engine mounts and

one with long bolts for the Lycoming dynafocal mount. The short style works

with motor mounts that have flat plates at the firewall while the long style

works with mounts (like William Wynne's Corvair mount) with spools at the

firewall. I have factory-made parts in both styles.



I think that the factory has taken to delivering the brackets without the

bolts welded on. This allows you to line-drill all the parts after the

fuselage is put together. Nick sent me this back in Feb 2006:



"In the latest edition, we no longer weld the bolt to the engine mount

fitting. For the lower engine mount fittings, installing the bolt after the

fitting is installed to the fuselage allows for better alignment. For a 38mm

long bushing, allow approximately 3mm to go through the fitting, the doubler

and firewall = 41mm A better bolt to use is an AN6-22A (grip length =

1-11/16")"



-- Craig

Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Thu Apr 12, 2007 6:33 am Post subject: Re: Corvair firewall

Yes they have. When I decided on the Corvair I had already fitted the shorter bolt welded brackets. I replaced these with the non-welded ones that also have the canopy attach point.



One thing to keep in mind if you use these is you will need to attach the engine mount while you can still get to the back of the firewall.

 	  craig(at)craigandjean.com wrote: 	
		  

I think that the factory has taken to delivering the brackets without the

bolts welded on. This allows you to line-drill all the parts after the

fuselage is put together. Nick sent me this back in Feb 2006:



"In the latest edition, we no longer weld the bolt to the engine mount

fitting. For the lower engine mount fittings, installing the bolt after the

fitting is installed to the fuselage allows for better alignment. For a 38mm

long bushing, allow approximately 3mm to go through the fitting, the doubler

and firewall = 41mm A better bolt to use is an AN6-22A (grip length =

1-11/16")"



-- Craig

_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

naumuk(at)alltel.net
Guest

Posted: Thu Apr 12, 2007 5:24 pm Post subject: Corvair firewall

Mark-

     This is the answer to  what I have been looking for. As you can see, I want to get this into the  Matronics archives. Thanks.

 Bill Naumuk

HDS Fuse/Corvair

Townville, Pa

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naumuk(at)alltel.net
Guest

Posted: Fri Apr 13, 2007 2:18 pm Post subject: Corvair Firewall

All-

     As you know, sometimes you save  time by taking sthe time to research. I don't think this was a stupid question,  and I think it's one that anyone considering a Corvair install should think  about before punching holes in a hard to replace firewall. 

     Thanks to all for your input.  Unlike the cattycorner brace question, there is a definitive answer to this one,  and now it's in the archives for future builders to refer to.

     It took me a week to get an  answer to my question, probably because I didn't communicate exactly what I was  looking for well. Now do all you listers see the need for a place you can go to  get definitive answers to questions that have been puzzling builders  since Moses was the foreman at Zenith? 

     

 Bill Naumuk

HDS Fuse/Corvair

Townville,  Pa

   [quote][b]

Jaybannist(at)cs.com
Guest

Posted: Wed Apr 25, 2007 4:47 am Post subject: Corvair Firewall

To XL Corvair builders:



I need to start mounting "stuff" on my firewall.  I am trying to follow WW recommendations, but since I don't have anything from WW, I am kind of working in the dark, mostly from photos. I have attached a pdf drawing of what I am planning.  I would greatly appreciate any input, especially from those of you that have  completed your FWF.  



Thanks in advance,

Jay in Dallas

Do not archive

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naumuk(at)alltel.net
Guest

Posted: Wed Apr 25, 2007 2:28 pm Post subject: Corvair Firewall

Jay-

    Bless you, my son! Everyone, keep this string going!!

Bill Naumuk

HDS Fuse/Corvair

Townville, Pa

---

Jaybannist(at)cs.com
Guest

Posted: Wed Apr 25, 2007 2:39 pm Post subject: Corvair Firewall

Bill,



It's not much of a "string" at this point; one reply does not a string make. In spite of that, yesterday I fabbed the mounting bracket for the ignition coils and today I installed them.  



Jay in Dallas

Do not archive



"Bill Naumuk" <naumuk(at)alltel.net> wrote:



[quote]



Jay-

    Bless you, my son! Everyone, keep this string going!!

Bill Naumuk

HDS Fuse/Corvair

Townville, Pa

---

craig(at)craigandjean.com
Guest

Posted: Wed Apr 25, 2007 3:52 pm Post subject: Corvair Firewall

Jay, I don't know what photos you have but FWIW I have lots of shots of

these 601XL/Corvair installations:



- William's 601XL tail dragger

- Phil Maxson's 601XL



I've got 54 photos totaling 64 MB. I can stick these on a CD and mail it to

you if you want.



Also I assume you've browsed Chris Steiner's and Bill Howerton's sites?



http://homepage.mac.com/csteiner/PhotoAlbum8.html



http://bill.howerton.com/zodiac/engine_page.htm



Some folks apparently have early copies of William's long promised FWF

manual but not me.



-- Craig

601zv(at)ritternet.com
Guest

Posted: Wed Apr 25, 2007 5:30 pm Post subject: Corvair Firewall

Jay,

Sorry I can't really add anything, but I guess I'm doing essentially as you 

are as far as figuring out the firewall layout (going by pictures etc.), as 

what I have so far installed and planned to install matches your drawings 

perfectly, with only exceptions being probably insignificant variations on 

the placement of those items on the cockpit side of firewall. Anyway, it's 

nice to know that at least someone else is thinking along the same lines, 

and I really appreciate your taking the time to make and show your drawings 

because if anyone finds fault with them I will probably have the same 

problem.



Do not archve.



---

Afterfxllc(at)aol.com
Guest

Posted: Wed Apr 25, 2007 5:45 pm Post subject: Corvair Firewall

I have a complete FWF finished and can give you any information and  measurements you need. here are some pics.



See what's free at AOL.com.

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