Wing rear spar?

tshort · Post by **tshort** » Thu Jul 21, 2005 11:39 pm

Quick wing question...
When match drilling the doublers to the rear spar, I went ahead and drilled the #40 holes on the spar flange to the doubler ...
What happens with these? Are they dimpled together prior to riveting on the top skin? Didn't know if I should dimple anything before priming, 'cuz once the rear spar is riveted together my options will be dimple together or countersink the spar flange...

There is no mention of this in the manual ...

Thomas

captain_john · Post by **captain_john** » Fri Jul 22, 2005 12:13 am

Thomas, I think I know what you are asking.

That is a triple stack of material to be riveted with a single rivet at each location. All materials to be dimpled, nesting in together and fastened by a 3-5-ish (I am guessing) rivet. Where you have double meat, it will be something like a 3-4.

Does this help?

CJ

tshort · Post by **tshort** » Fri Jul 22, 2005 1:00 am

So did you dimple before you assembled the rear spar? Just seems like it might be easier to do before assembly rather than trying to dimple 2 of the 3 layers (spar flange and doubler) after assembly.

Thomas

captain_john · Post by **captain_john** » Fri Jul 22, 2005 6:40 am

Well, I was under the assumption you were referring to the SKIN doubler. Are you talking about the SPAR doublers where the aileron hardware attaches?

Lemme see if I can put this another way.

Bottom layer (Spar flange): Dimpled prior to installing forked spar doubler (because it is really hard to do after the forked doubler is riveted into place)

Middle layer (Wing Walk Doubler): Just match drill for now

Top Layer (Top Skin): This is your guide for match drilling, just match drill for now

Does this help?

CJ

tshort · Post by **tshort** » Fri Jul 22, 2005 8:50 am

CJ-

I'm talking about the doublers where the hardware attaches. They have a small bent flange that matches up with the rear spar flange and needs to be match drilled. At some point before the skins go on they will need to be either dimpled or countersunk - I was mainly wondering what / when...

Thomas

captain_john · Post by **captain_john** » Fri Jul 22, 2005 2:48 pm

Oh yah, yah, yahhhhhh...

I see, Okay...

Over THERE!!!

Well, ummmm... what the scoop is, seeee... They get countersunk later. You countersink da spar! The skin dimple will nest into that! Do it later, after the skin has been dimpled and is ready to be riveted on. The shop head will sit on the flat surface of the dubbler!

Proceed as planned! You didn't miss a trick!

CJ