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dgraham7(at)TWCNY.RR.COM
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 Posted: Fri Sep 03, 2010 5:12 pm Post subject: Nuts on outside |
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Group:
While I was waiting for a new prop this summer, I decided not to waste the downtime, so
I drilled the rivets out of the cover over my instrument panel and gas tank on my 601 HDS
and I replaced the rivets with nutplates, and with just bolts and nuts along the longerons.
Unfortunately, it was a son-of-a-gun to put nuts and bolts along the longerons. It would be
much easier if I were to thread the bolts from the inside and place the nuts along the
outside of the longeron, on just the passenger side of the plane. My plan is to use thin nuts
and the shortest 8-32 screws that I can. My AP/IA friend said that we can't do that, because it
is not aviation. I want to do it anyway because it would make it so much easier to access the instrument
panel and I don't think that it would affect streamlining significantly.
What say you, members of the jury ?
Regards,
Damien
N48TK
[quote][b]
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carlossa52(at)gmail.com
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| Posted: Fri Sep 03, 2010 5:39 pm Post subject: Nuts on outside |
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Demian, I would run this by the folks at Zenair.
Good luck
Carlos
CH601-HD
Fuselage work in progress
On 3 September 2010 21:11, Damien <dgraham7(at)twcny.rr.com (dgraham7(at)twcny.rr.com)> wrote:
[quote] Group:
While I was waiting for a new prop this summer, I decided not to waste the downtime, so
I drilled the rivets out of the cover over my instrument panel and gas tank on my 601 HDS
and I replaced the rivets with nutplates, and with just bolts and nuts along the longerons.
Unfortunately, it was a son-of-a-gun to put nuts and bolts along the longerons. It would be
much easier if I were to thread the bolts from the inside and place the nuts along the
outside of the longeron, on just the passenger side of the plane. My plan is to use thin nuts
and the shortest 8-32 screws that I can. My AP/IA friend said that we can't do that, because it
is not aviation. I want to do it anyway because it would make it so much easier to access the instrument
panel and I don't think that it would affect streamlining significantly.
What say you, members of the jury ?
Regards,
Damien
N48TK
[b]
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jeffrey_davidson(at)earth
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| Posted: Fri Sep 03, 2010 5:44 pm Post subject: Nuts on outside |
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Damien,
I'm not sure why you want to use nuts and bolts at all. Do you have the original side-to-side canopy? I drilled all the holes for riveting the top skin and then changed to use aviation nutplates and screws all around. It worked out fine, but I have an XL style canopy. The length of the bolt and how many threads extend past the nut are valid "aviation" considerations.
Jeff Davidson
CH601-HD
From: owner-zenith601-list-server(at)matronics.com [mailto:owner-zenith601-list-server(at)matronics.com] On Behalf Of Damien
Sent: Friday, September 03, 2010 9:11 PM
To: zenith601-list(at)matronics.com
Subject: Nuts on outside
Group:
While I was waiting for a new prop this summer, I decided not to waste the downtime, so
I drilled the rivets out of the cover over my instrument panel and gas tank on my 601 HDS
and I replaced the rivets with nutplates, and with just bolts and nuts along the longerons.
Unfortunately, it was a son-of-a-gun to put nuts and bolts along the longerons. It would be
much easier if I were to thread the bolts from the inside and place the nuts along the
outside of the longeron, on just the passenger side of the plane. My plan is to use thin nuts
and the shortest 8-32 screws that I can. My AP/IA friend said that we can't do that, because it
is not aviation. I want to do it anyway because it would make it so much easier to access the instrument
panel and I don't think that it would affect streamlining significantly.
What say you, members of the jury ?
Regards,
Damien
N48TK
| Quote: | | http://www.matronics.com/Navigator?Zenith601-List |
0123456789
[quote][b]
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psm(at)att.net
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| Posted: Fri Sep 03, 2010 6:26 pm Post subject: Nuts on outside |
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Hi Damien,
I found a slightly different way to accomplish the same goal you have. I cut two large inspection holes and made corresponding plates to cover them. This gives me relatively complete access to the area between the firewall and instrument panel without messing with the longerons or other structural components.
A picture is worth a thousand words:
[img]cid:image001.jpg(at)01CB4B9D.9881E770[/img]
Paul
XL upgrading second wing
From: owner-zenith601-list-server(at)matronics.com [mailto:owner-zenith601-list-server(at)matronics.com] On Behalf Of Damien
Sent: Friday, September 03, 2010 6:11 PM
To: zenith601-list(at)matronics.com
Subject: Nuts on outside
Group:
While I was waiting for a new prop this summer, I decided not to waste the downtime, so
I drilled the rivets out of the cover over my instrument panel and gas tank on my 601 HDS
and I replaced the rivets with nutplates, and with just bolts and nuts along the longerons.
Unfortunately, it was a son-of-a-gun to put nuts and bolts along the longerons. It would be
much easier if I were to thread the bolts from the inside and place the nuts along the
outside of the longeron, on just the passenger side of the plane. My plan is to use thin nuts
and the shortest 8-32 screws that I can. My AP/IA friend said that we can't do that, because it
is not aviation. I want to do it anyway because it would make it so much easier to access the instrument
panel and I don't think that it would affect streamlining significantly.
What say you, members of the jury ?
Regards,
Damien
N48TK
| Quote: | | http://www.matronics.com/Navigator?Zenith601-List |
0123456789
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dgraham7(at)TWCNY.RR.COM
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| Posted: Sun Sep 05, 2010 2:02 pm Post subject: Nuts on outside |
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Thanks for all of your responses.
I had thougt about making inspection holes as Paul did, but I have already
gone forward with the anchor nuts. I am going to use anchor nuts along the sides also, as
Jeff did. I was hesitant to drill the extra holes in the longeron.
Thanks,
Regards,
Damien
DO NOT ARCHIVE
[quote] ---
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chuck960
Joined: 11 Mar 2009
Posts: 44
Location: PA
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| Posted: Sun Sep 05, 2010 3:12 pm Post subject: Re: Nuts on outside |
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You could cut a strip of 4130 steel .090 minimum to fit the inside of the longeron the length of the holes you want to put screws in plus 20mm or so. Then backdrill from the outside and tap the holes for 8-32 screws. The strip would only strengthen the longeron when the screws were in place.
You could glue the strip to stay put when the screws were out but I think two flush rivets placed between the existing holes would be ok.
Chuck
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chuck960
Joined: 11 Mar 2009
Posts: 44
Location: PA
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| Posted: Mon Sep 06, 2010 8:56 am Post subject: Re: Nuts on outside |
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Another idea that came to me while walking this morning.
Cut a strip of 6061 aluminum 16 mm x the length of holes along the longeron and top skin overlap, and add 20 mm.
Clamp the strip to the longeron inboard side and backdrill the holes.
Remove the strip and flush rivet your rivnuts to the strip.
Using two sided tape stick the strip to the longeron.
Now you have rivnuts where you need them without drilling any new holes in the longeron.
Chuck
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dgraham7(at)TWCNY.RR.COM
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| Posted: Mon Sep 06, 2010 11:56 am Post subject: Nuts on outside |
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Chuck:
That is a great idea. After I finish adding the anchor nuts to the strip, I
may stiffen the strip with a thin piece of metal or wood. It would make it
easier to re-apply. Thanks for giving it more thought.
Regards,
Damien
---
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chuck960
Joined: 11 Mar 2009
Posts: 44
Location: PA
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| Posted: Mon Sep 06, 2010 7:25 pm Post subject: Nuts on outside |
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Damien,
Keep in mind you are messing around with a structural part of your aircraft. The skin is what gives your ship it's strength. By drilling out the rivets along the top forward longer's you have weakened the fuselage. You may need to add rivets to bring back the strength but there is a prescribed method as called out by the designer. You simply can't count on some screws to replace rivets even if the screws are stronger.
I'm not getting a feeling that you have much experience with this kind of work.
Please run this by your ap/ia friend and see what he thinks.
Chuck
---- Damien <dgraham7(at)TWCNY.RR.COM> wrote:
[quote]
Chuck:
That is a great idea. After I finish adding the anchor nuts to the strip, I
may stiffen the strip with a thin piece of metal or wood. It would make it
easier to re-apply. Thanks for giving it more thought.
Regards,
Damien
---
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