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Firewall Bend

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Michael Wynn

Joined: 10 Jan 2006
Posts: 148
Location: San Ramon, CA

Posted: Wed Dec 27, 2006 4:40 pm Post subject: Firewall Bend

Hi all,

  

 I am just starting the fuselage.  There is an instruction to put an 8  degree forward bend in the firewall.  I clamped the firewall between my  bench and a "sharp edged board" for the bend.  It was pretty sharp at the  edges, but much more gradual in the middle.  How crucial is this?   Should I really work at getting a sharp bend all the way across?   

 Regards,



Michael Wynn

RV-8, Fuselage

San Ramon,  California



  [quote][b]

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_________________
Michael Wynn
RV 8
San Ramon, CA

pitts_pilot(at)bellsouth.
Guest

Posted: Wed Dec 27, 2006 4:55 pm Post subject: Firewall Bend

MLWynn(at)aol.com (MLWynn(at)aol.com) wrote:

  	  Quote: 	
		                   Hi all,

      

     I am just starting the fuselage.  There is an instruction to put an 8  degree forward bend in the firewall.  I clamped the firewall between my  bench and a "sharp edged board" for the bend.  It was pretty sharp at the  edges, but much more gradual in the middle.  How crucial is this?

   	
 Well, I'm not sure about crucial.  Probably not.

  	  Quote: 	
		        Should I really work at getting a sharp bend all the way across?

   	
 Yeah, I think so.  It'll look far better and it won't bug ya forever.  I think the 'sharp edged board' probably bowed when you tried to bend the firewall.  Clamp the firewall on the 'sharp edged board' so it won't move and use a rubber mallet on the crease to make it even all the way across.

 Linn

 do not archive

 [quote]         

     Regards,

   

 Michael Wynn

 RV-8, Fuselage

 San Ramon,  California

   

   

   

         	  Quote: 	
		  

	
 [b]

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martin(at)gbonline.com
Guest

Posted: Wed Dec 27, 2006 7:36 pm Post subject: Firewall Bend

Mike,

 The bend in the firewall in my opinion is important, but not crucial.   I would suggest that you try to improve the bend so that it is constant all of  the way across the firewall.  If you lack sheetmetal forming tools such a a  brake, you could try a square piece of hardwood the length of the bend and tap  it against the bend location with a mallet.  the sheetmetal must have some  type of backing to pound against such as a piece of angle or better yet a  hardwood board with a groove cut in it to receive the bend.  Use your  imagination, their are many other ways to accomplish this bend..Note , always  practice on a piece of scrap first.  The first bend is the best bend,  continous pounding will work harden the metal  and ruin it.

 Good luck.

 Dick Martin

 RV8 N233M

 the fast one

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brucerv84us(at)hotmail.co
Guest

Posted: Wed Dec 27, 2006 8:28 pm Post subject: Firewall Bend

Michael,

I'm curious that you are putting this bend in so soon. You stated you have 

just begun the fuse. I just finished this task a few months ago and was 

fitting the forward hood over the instrument panel and the construction 

manual stated to do it then. Now I may be wrong I have not yet seen the new 

drawings nor the construction print so it may be different now.

Anyways I put a small 1x2 strip of hardwood on the fwd side of the firewall 

just under the bend line and a heavy duty piece of angle aluminum on the aft 

side sandwiching the firewall. Using the clamp handles as the lever I gentle 

put the bend in checking each time with an angle finder. The main thing you 

are looking for is that the 821 has good transition from the panel bulkhead, 

baggage bulkhead, and firewall(801). It will be a lot more clear when you 

have the roll-over bar in place with the glare shield cut-out done and you 

are positioning the 821 side to side and fore and aft for drilling.

Hope this helps and if not e-mail me and I will produce some photo's for 

you.

Good luck,



Bruce G

RV8 Fuse

 	  Quote: 	
		  From: MLWynn(at)aol.com

Reply-To: rv-list(at)matronics.com

To: rv-list(at)matronics.com

Subject: Firewall Bend

Date: Wed, 27 Dec 2006 19:38:54 EST



Hi all,



I am just starting the fuselage.  There is an instruction to put an 8  

degree

forward bend in the firewall.  I clamped the firewall between my  bench and 

a

"sharp edged board" for the bend.  It was pretty sharp at the  edges, but

much more gradual in the middle.  How crucial is this?   Should I really 

work at

getting a sharp bend all the way across?



Regards,



Michael Wynn

RV-8, Fuselage

San Ramon,  California




	


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Get live scores and news about your team: Add the Live.com Football Page 

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Hopperdhh(at)aol.com
Guest

Posted: Thu Dec 28, 2006 3:57 am Post subject: Firewall Bend

Michael,

  

 I have read the responses so far, and I must admit that I'm probably out to lunch here.  But, I didn't put a "bend" in the firewall at all.  I just let it happen on its own, and IMHO it looks fine.

  

 Given that you have started the bend, use a piece of hardwood about a foot or two long (to hammer lightly on) to help shape your bend in the middle.  This piece is like a mirror and will show every minor imperfection.

  

 Dan Hopper

 RV-7A -- In the backwoods of the Midwest.

  

  

 In a message dated 12/27/2006 7:42:42 PM Eastern Standard Time, MLWynn(at)aol.com writes:

  	  Quote: 	
		   Hi all,

  

 I am just starting the fuselage.  There is an instruction to put an 8 degree forward bend in the firewall.  I clamped the firewall between my bench and a "sharp edged board" for the bend.  It was pretty sharp at the edges, but much more gradual in the middle.  How crucial is this?  Should I really work at getting a sharp bend all the way across?   

 Regards,



Michael Wynn

RV-8, Fuselage

San Ramon, California



	


 

  [quote][b]

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Michael Wynn

Joined: 10 Jan 2006
Posts: 148
Location: San Ramon, CA

Posted: Sat Dec 30, 2006 5:54 pm Post subject: Firewall Bend

Thanks to all for your input.

  

 The reason I am doing it now is that in the prepunch instructions, it comes  along on the second page.  Makes sense to do it before dimpling the  firewall or riveting anything to it.

  

 Someone suggested that my backing  board probably bent away. I think  that is correct.  I fixed the issue by clamping boards on both sides (fore  and aft) of the bend line.  I then faced it down (Vans instructions  had  you bending up) and went across the bend line with a wood block and a  rubber hammer.  It is not completely sharp all the way across, but  definitely acceptable.  I did not want to work harden the firewall by being  over-compulsive.

  

 If I were to do it again, I would use the two board technique and maybe  even use something like a wallpaper roller to make an consistent and straight  bend.

  

 Regards,

  

 Michael Wynn

 RV 8 (Prepunch) Fuselage

  [quote][b]

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_________________
Michael Wynn
RV 8
San Ramon, CA

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