 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Terry Phillips
Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT
|
 Posted: Wed Jun 02, 2010 9:04 pm Post subject: Upgrade Question - Main Spar Carry Through |
 |
|
Hi James
I am far from taking my center spar apart, but I have been thinking about
that alignment problem for a while.
It seems to me that the best thing would be to actually bolt both wing
spars to the two sides of the center spar before riveting the two sides
together. That may be overkill, however. At a minimum, I think I'd want to
put all 12 bolts in place on the center spar, with appropriate spacers
between the top and bottom middle bolts, before I drilled the new doubler
that will tie the tops of the center spar together. They must line up, and
the holes must be tight. Since the holes are already drilled, they holes
must be aligned before the two sides of the spar are drilled and riveted
together.
However, I haven't even looked at the instructions for upgrading the center
spar, and it may be covered there. Let us know how you resolve this.
Terry
At 09:47 PM 6/1/2010 -0700, you wrote:
| Quote: | Thanks wa7dvd. That seems to be a solution as I think that the upgrade
manual suggests drilling through the existing holes in the forward flange
of the spar which will clip the old cabin floor holes. I note that in one
of the upgrade videos you can see that their clecos are squint because of
this. Is there sufficient edge distance between the old and new holes in
your method?
Anyone else got a solution for the bolt hole alignment on the upgraded spar?
James
|
Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
ZU-601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail & flaps are done;
Upgrading wings & ailerons per the AMD Safety Directive
http://www.mykitlog.com/N47TP/
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith601-List |
|
_________________
Terry Phillips
Corvallis, MT
ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings. |
|
| Back to top |
|
 |
Scotsman
Joined: 27 Aug 2007
Posts: 89
Location: Johannesburg, South Africa
|
| Posted: Wed Jun 02, 2010 10:10 pm Post subject: Re: Upgrade Question - Main Spar Carry Through |
|
|
Hi Terry, Good to hear from you again.
The problem is that even without the actual wing spars in place I can see that the alignment is very slightly off on the outside bolt holes only. If I turn a wing spar bolt it twists into place (probably exerting some pressure on the thread but if i use a 5/16 transfer punch (ie. an object with straight sides it will not fit easily as it clips (very slightly) the edge of the web on the far side's bolt hole). Oddly, the other in board bolt holes seem to be, in general, well aligned.
I note that the bolt holes were drilled by Zenith (ie. this was a kit not plans built) and the only modification I have made is in accordance with the upgrades to the carry through spar.
I am very reluctant to ream the holes any further as on each web individually I have a nice fit (very) fit...especially after all the incidents and conversations on the forum.
Any help would be appreciated. Has anyone had this problem?
James
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith601-List |
|
_________________
Cell +27 83 675 0815 |
|
| Back to top |
|
|
Louie928
Joined: 15 Nov 2009
Posts: 32
Location: Mosier, OR USA
|
| Posted: Sat Jun 05, 2010 1:20 pm Post subject: Re: Upgrade Question - Main Spar Carry Through |
|
|
Terry,
Check Jake Reyna's blog on the Zenith.aero forum. Jake has a procedure and pictures of how he handled the placement of the holes in the center spar front flange. Basically, he used the floor doubler as a template and drilled new holes between the existing holes. That gave him solid material all the way through the bottom doubler, floor, and spar flange. No dealing with having to drill through half misaligned holes in the floor. You drill through the bottom doubler and front spar flange on the work table, then only have to back drill through the floor with the doubler (template) in position under the fuselage. I did mine that way and I'm satisfied with it.
| Terry Phillips wrote: | Hi James
I am far from taking my center spar apart, but I have been thinking about
that alignment problem for a while.
It seems to me that the best thing would be to actually bolt both wing
spars to the two sides of the center spar before riveting the two sides
together. That may be overkill, however. At a minimum, I think I'd want to
put all 12 bolts in place on the center spar, with appropriate spacers
between the top and bottom middle bolts, before I drilled the new doubler
that will tie the tops of the center spar together. They must line up, and
the holes must be tight. Since the holes are already drilled, they holes
must be aligned before the two sides of the spar are drilled and riveted
together.
However, I haven't even looked at the instructions for upgrading the center
spar, and it may be covered there. Let us know how you resolve this.
Terry
At 09:47 PM 6/1/2010 -0700, you wrote:
| Quote: | Thanks wa7dvd. That seems to be a solution as I think that the upgrade
manual suggests drilling through the existing holes in the forward flange
of the spar which will clip the old cabin floor holes. I note that in one
of the upgrade videos you can see that their clecos are squint because of
this. Is there sufficient edge distance between the old and new holes in
your method?
Anyone else got a solution for the bolt hole alignment on the upgraded spar?
James
|
Terry Phillips
ttp44~at~rkymtn.net
Corvallis MT
ZU-601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail & flaps are done;
Upgrading wings & ailerons per the AMD Safety Directive
http://www.mykitlog.com/N47TP/ |
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith601-List |
|
_________________
Louis W. Ott
601XL-B Corvair |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
