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XL forward fuselage top thickness

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a.s.elliott(at)cox.net
Guest

Posted: Sun Mar 23, 2008 12:27 am Post subject: XL forward fuselage top thickness

Looking for experience & opinions - I have made a pattern and am ready  to cut the forward fuselage top skin (6C1-4).  I find that the while the  plans show it to be .020, some of the kits and factory built aircraft have it as  .025.  

  

 I do plan to modify the sheet as many have, so that the section  between the panel side angles, firewall and instrument panel is removable  via lots of #8 screws, and the section where the canopy rail goes is riveted in  place.

  

 Estimating the area as 4 sq.ft., the weight difference between the .020  skin and the .025 skin would be ~103.5 gms, which is less than 4 ounces.

  

 SO... Anyone have any comments about whether to use the .020 or the .025  material, especially in terms of holding up in use and maintenance?

  

 Thanks,

 Andy Elliott, Mesa, AZ

N601GE (reserved)

601XL/TD, Corvair,  building...

   [quote][b]

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Jaybannist(at)cs.com
Guest

Posted: Sun Mar 23, 2008 5:49 am Post subject: XL forward fuselage top thickness

Andy,



My kit came with .025 top forward skin.  When I cut a great bid access hole, I surrounded the hole with .032 angles and added a brace at the top.  See my drawing on www.ch601.org.  One change I made from that drawing is the sealing material.  I actually used a rubber electrical joint tape on the inside edges of the reinforcing angles.



Jay in Dallas

"Dr. Andrew Elliott" <a.s.elliott(at)cox.net> wrote:



 	  Quote: 	
		  Looking for experience & opinions - I have made a pattern and am ready to cut the forward fuselage top skin (6C1-4).  I find that the while the plans show it to be .020, some of the kits and factory built aircraft have it as .025.



I do plan to modify the sheet as many have, so that the section between the panel side angles, firewall and instrument panel is removable via lots of #8 screws, and the section where the canopy rail goes is riveted in place.



Estimating the area as 4 sq.ft., the weight difference between the .020 skin and the .025 skin would be ~103.5 gms, which is less than 4 ounces.



SO... Anyone have any comments about whether to use the .020 or the .025 material, especially in terms of holding up in use and maintenance?



Thanks,

Andy Elliott, Mesa, AZ

N601GE (reserved)

601XL/TD, Corvair, building...

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larry(at)macsmachine.com
Guest

Posted: Sun Mar 23, 2008 6:43 am Post subject: XL forward fuselage top thickness

Hi Andy,

I'd recommend you go with .025 and use 6-32 screws in U-clips that fit 

.025 to .040.

See McMaster Carr 94809A102

Part Number:  94809A102 

<http://www.mcmaster.com/itm/find.ASP?tab=find&context=psrchDtlLink&fasttrack=False&searchstring=94809A102> 

	

 $13.53 per Pack of 50

Nut Type

	Speed Nuts

Applications

	For Machine Screws

Speed Nut Type

	J-Style Clip-On Nuts

J-Style Clip-On Nuts Style

	Shape 2

Material Type

	Steel

Finish

	Black

Grade/Class

	Not Rated

Steel Type

	Plain Steel

System of Measurement

	Inch

Inch Thread Size

	6-32

For Panel Thickness

	.025"-.04"

Center of Hole to Panel Edge

	.468"

Thread Direction

	Right-Hand Thread

Thread Type

	Standard Threads

Specifications Met

	Not Rated

These are a great fastener, they're easily replaced and make the removal 

and install painless.

I have about 80 of these holding the forward top skin on my 601HDS.



http://www.macsmachine.com/images/canopy/full/uclips.gif

http://www.macsmachine.com/images/canopy/full/cnpyrailcover.gif



Larry McFarland 601HDS at www.macsmachine.com

Dr. Andrew Elliott wrote:

 	  Quote: 	
		   Looking for experience & opinions - I have made a pattern and am ready 

 to cut the forward fuselage top skin (6C1-4).  I find that the while 

 the plans show it to be .020, some of the kits and factory built 

 aircraft have it as .025. 

  

 I do plan to modify the sheet as many have, so that the section 

 between the panel side angles, firewall and instrument panel is 

 removable via lots of #8 screws, and the section where the canopy rail 

 goes is riveted in place.

  

 Estimating the area as 4 sq.ft., the weight difference between the 

 .020 skin and the .025 skin would be ~103.5 gms, which is less than 4 

 ounces.

  

 SO... Anyone have any comments about whether to use the .020 or the 

 .025 material, especially in terms of holding up in use and maintenance?

  

 Thanks,

 Andy Elliott, Mesa, AZ

 N601GE (reserved)

 601XL/TD, Corvair, building...

 *

 *

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Tim Juhl

Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan

Posted: Sun Mar 23, 2008 7:34 am Post subject: Re: XL forward fuselage top thickness

Here is a faster link to Jay's excellent drawing:



http://www.ch601.org./resources/zodiac%20updates/access%20panel/InstrAccess2.pdf



Tim



do not archive

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_________________
______________
CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring!

Aerolitellc(at)aol.com
Guest

Posted: Sun Mar 23, 2008 11:57 am Post subject: XL forward fuselage top thickness

Use .025 I have zenith make every skin on my kits .025 and all control  surfaces .020. It gives you a much better airframe.

  

 Jeff



Create a Home Theater Like the Pros. Watch the video on AOL Home.

  [quote][b]

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