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Another Firewall Question

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Michael Valentine

Joined: 09 Jan 2006
Posts: 108

Posted: Mon Apr 30, 2007 7:00 am Post subject: Another Firewall Question

Hi again folks, 



I don't know if I am being dumb or if the firewall section is just poorly documented, but I have more problems already.  Unfortunately, I do not have my plans in front of me so I can't give part numbers.  I think it is pages 6B6 and 6B7 (maybe 8, too) -- 601XL. 



There does not seem to be any measurements on the plans or in the guide as to the center channel doubler (I think that is what it is called).  The guide says to drill those holes first, but there is nothing on the plans about where to drill them except that they are A4/40mm!  The plans just show some hash marks, which I have never found to be accurate.  So, does anyone have specifics on where the rivet line should go? 



Also, there are two wedge shaped pieces at the top on either side of the channel.  Again, there are hash marks on the plans, but no measurements as to where the rivet lines should go.



Sorry for the non-specific references, but if you understand the questions then I would appreciate any suggestions. 



Michael in NH

601XL

  [quote][b]

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rogers_pritchard(at)yahoo
Guest

Posted: Mon Apr 30, 2007 8:21 am Post subject: Another Firewall Question

Michael,

   

  Give me a call at 603-496-7542

   

  Roger



Michael Valentine <mgvalentine(at)gmail.com> wrote:

  [quote]Hi again folks, 



I don't know if I am being dumb or if the firewall section is just poorly documented, but I have more problems already.  Unfortunately, I do not have my plans in front of me so I can't give part numbers.  I think it is pages 6B6 and 6B7 (maybe 8, too) -- 601XL. 



There does not seem to be any measurements on the plans or in the guide as to the center channel doubler (I think that is what it is called).  The guide says to drill those holes first, but there is nothing on the plans about where to drill them except that they are A4/40mm!  The plans just show some hash marks, which I have never found to be accurate.  So, does anyone        Ahhh...imagining that irresistible "new car" smell?

 Check out [url=http://us.rd.yahoo.com/evt=48245/*http://autos.yahoo.com/new_cars.html;_ylc=X3oDMTE1YW1jcXJ2BF9TAzk3MTA3MDc2BHNlYwNtYWlsdGFncwRzbGsDbmV3LWNhcnM-]new cars at Yahoo! Autos.[/url]  [quote][b]

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Flydog1966(at)aol.com
Guest

Posted: Mon Apr 30, 2007 9:21 am Post subject: Another Firewall Question

In a message dated 4/30/2007 11:01:11 A.M. Eastern Daylight Time,  mgvalentine(at)gmail.com writes:

  	  Quote: 	
		  The    plans just show some hash marks, which I have never found to be    accurate.  So, does anyone have specifics on where the rivet line should    go? 



Also, there are two wedge shaped pieces at the top on either side    of the channel.  Again, there are hash marks on the plans, but no    measurements as to where the rivet lines should  go.

	


 

   The hash marks on the 701 plans mean - "no rivet  zone". 



See what's free at AOL.com. 

  [quote][b]

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craig(at)craigandjean.com
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Posted: Mon Apr 30, 2007 11:06 am Post subject: Another Firewall Question

 	  Quote: 	
		   So, does anyone have specifics on where the rivet line should go?


	


On the plans dated 03/04 6-B-8 calls out two rows of "A4 pitch 40" rivets

along the vertical U channel. It shown them set in from the side bends by 10

mm. The same page calls for "5 rivets A5" into the "gear gusset" (6B8-1).

The side view on that page shows the rivets in an inverted "L" pattern with

three rivets spread across the width of the side of the center U channel and

three rivets down a line parallel to the bend in the central channel. 3+3=5

because of the common rivet in the corner of the "L". To me the side view

shows that the placement of the rivets is bounded by the intersection of the

standard edge distances on the triangular gusset and the center U channel.



BTW: I don't know if you know or care but Zenith has redesigned and

strengthened the pieces on the firewall. The triangular corner gussets have

evolved into pieces 330 mm tall which reach all the way down to reinforce

the 5/8 inch pipe for the bungee. The two doublers around the hole for the

pipe are replaced by a single U-shaped piece. An angle is added across the

width of the horizontal stiffener 6B7-1 and tied to it with a vertical

plate. Angles are riveted along the two diagonal edges of the horizontal

stiffeners. I've attached an image from the 03/06 version of 6-B-8. The new

parts cost me $181 from Zenith.



 	  Quote: 	
		    The plans just show some hash marks, which I have never found to be

accurate. 
	


 

The construction manual says:

 

"The number of rivets is given in digits (so is the pitch - the spacing

between holes); do not attempt to count the dots from the drawings!"



-- Craig

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jeffrey_davidson(at)earth
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Posted: Mon Apr 30, 2007 4:48 pm Post subject: Another Firewall Question

Do not archive

Strengthening the firewall has been a constant process.  My HD plans just

show a couple Ls where the triangular gussets used to be.  I upgraded to the

triangles, added the U channel on the cabin side, used the thicker XL

"shelf" and retained the old L pattern from the HD plans in addition.  I saw

what Craig is describing in the current Kitplanes article on the quick build

kit.  Certainly the firewall and nose gear continue to undergo

strengthening.  There must be a reason ....  Jeff Davidson

  



--

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