From the "Potential causes of damage to 2-2-V-1" thread...
The transparent material was held in place by the aluminum frame we see in the "AE & Nilla" photo. To remove the transparent material it was probably necessary to remove the frame.
How do you know that? Is that the case with the other windows? Maybe the frame is just a trim piece.
It would make no sense to reinstall the frame and then put a patch on top of it.
I would agree that it would "seem" to make no sense but we weren't there, we don't know why or even how the patch was installed so we can't know what made sense to the installer.
The patch was probably riveted to the same underlying structures the frame had been riveted to, with the apparent addition of an additional stringer along the bottom edge.
I agree... with or without the frame.
and back to the "2-2-V-1" thread...
Sheet metal screws could have been used entirely for the patch
I agree... almost. My thought is that the patch was riveted around its edges exactly as the frame had been but where the stiffeners were added sheet metal screws were used. This would explain the tearing around the perimeter of 2-2-V-1 and also the lack of any distortion around the rivet holes. The screws could have rusted away or, more likely I think, been removed by someone.
Not knowing the reason for installing the patch I think it's possible the plexiglas remained in place. Brad Beeching hinted at this earlier this year but it didn't generate much response...
Do you think there is any more information to be gleaned from Artifact 2-3-V-2 and Artifact 2-2-V-1 that might tie the two together? And are there any plans to further scrutinze 2-3-V-2 in the same manner we have investigated 2-2-V-1?
Along with the plexiglas I recall several metal artifacts that could have been parts of stiffeners or stringers. So, has anyone looked into the possibility of tying any of these items together?
Aside from pop rivets I've never riveted anything in my life. But I have had occasion to remove a few and whether I've drilled, ground (grinded?), or filed them I've never ended up with holes as pristine as the ones remaining in 2-2-V-1 and, while I do believe the patch is from the Electra, I just have a hard time believing those holes ever held a rivet.