Today's Message Index:
----------------------
1. 12:00 PM - Re: Oil canning (Steve Sampson)
2. 07:40 PM - Alodine learning (Curt Hoffman)
3. 08:43 PM - Re: Alodine learning (Gary)
4. 09:22 PM - Re: Oil canning (DThomas773@aol.com)
Message 1
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> RV9-List message posted by: "Steve Sampson" <SSampson.SLN21@london.edu>
Dennis - you expressed interest so now it is fixed (finished today) I
thought I had better tell you what I learned.
The problem was the innermost bay on the outer/under skin where it overlaps
the inner skin. I had an oil can valley that came up to the inspection
hatch.
The solution was to drill out the double row of rivets at the overlapping
skins and then rivet them up again. However, when we rivited them up we only
riveted up the holes that exactly aligned and we were very careful to rivet
'outwards and forwards' all the time. Then we ran a drill through the
remaining misaligned ones, presqueezed longer rivets and closed it up. By
this time > 95% of the problem was gone. It was only noticeable because I
had become so critical of this area. Today I put the hatch on and with that
screwed down, the problem is > 99% gone. (I will always imagine I can see
something until I forget which wing and cant find it!)
The problem may have been compounded by the fact that I perhaps did not
chamfer the inner skin at the rear spar as much as I might so the outer skin
had a bit of a step down to the spar. Putting the rivet nearest to the two
skin layers into the spar may have stretched the outer skin also.
So why were the holes out of line? (We are talking perhaps 1/8th of the
diameter of the 3/32 hole. Minute! I should also say that when match drilled
my policy is a cleco in every other hole.) The misalignement was a few holes
only, and a minute amount, and they tended to be near the trailing edge.
When we first riveted it up I think we tended to rivet the rivet that goes
through the 2 skins AND the rib BEFORE we did the 2 skins rivet. This I
guess is at odd with VANS instruction to rivet 'outwards and forwards'.
(This was because the rib rivets are easier than the 'floating' skin
rivets.) Perhaps the act of riveting makes 'extra' skin which gets pushed
ahead if you always move out, but nowhere to go otherwise. The amazing thing
to me is that a tiny movement can cause such an ugly problem.
This was the second wing and the problem had not occurred on the first. I
worked with a far LESS experienced riveting partner on the first wing! (The
only oil canning I now have is in a QB Philippines fuse area and it is very
very slight.) In the future I will be VERY careful always to move outwards
on skins so 'spare' metal moves ahead.
So I hope you have no problems.
Remember - always outward!
Steve
#90360
UK
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com] On Behalf Of
DThomas773@aol.com
Subject: Re: RV9-List: Oil canning
--> RV9-List message posted by: DThomas773@aol.com
Hi Steve,
Please keep us posted on your progrees. I am about a week away from bottom
wing skins so I'll be following with interest.
Dennis Thomas
wings
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Alodine learning |
--> RV9-List message posted by: "Curt Hoffman" <choffman9@cinci.rr.com>
Just learned something today. If you are an acid etcher and alodiner like myself-
If you leave the plastic covering on a bracket the acid etch and alodine are
really ineffective. Go figure.
Also- after that little piece of learning I primed the last few pieces of the wing
and ordered the empennage today ( I decided to go backwards since I had already
built a -6 tail before), Next I figure I'll do the finish kit and then order
the fuselage : ).
Curt Hoffman
RV-9A wings - tail on order
1968 Mustang 302 convertible
Piper Cherokee N5320W
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Alodine learning |
--> RV9-List message posted by: "Gary" <rv9er@3rivers.net>
Alright, Curt! Sounds like me. I riveted the stiffeners to one side of my elevator
before removing the plastic. Thankfully, Van's has begun using colored
plastic because of guys like us. One should never be afraid to try a new method.
I think I feel inspired to try riveting before I deburr and dimple.
Do not archive.
Gary
----- Original Message -----
From: Curt Hoffman
To: rv9-list@matronics.com
Sent: Saturday, December 21, 2002 9:39 PM
Subject: RV9-List: Alodine learning
--> RV9-List message posted by: "Curt Hoffman" <choffman9@cinci.rr.com>
Just learned something today. If you are an acid etcher and alodiner like myself-
If you leave the plastic covering on a bracket the acid etch and alodine
are really ineffective. Go figure.
Also- after that little piece of learning I primed the last few pieces of the
wing and ordered the empennage today ( I decided to go backwards since I had
already built a -6 tail before), Next I figure I'll do the finish kit and then
order the fuselage : ).
Curt Hoffman
RV-9A wings - tail on order
1968 Mustang 302 convertible
Piper Cherokee N5320W
---
Version: 6.0.406 / Virus Database: 229 - Release Date: 10/28/02
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> RV9-List message posted by: DThomas773@aol.com
Hi Steve,
Thanks for the information. I just finished fitting the ailerons and all the
aileron hardware today and will start next with nav, landing lights and
wiring. With that done it will my turn to deal with bottom skins.
Dennis
N164DV
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|