How to flute the F-01412A/B and F-0140 Bulkhead flanges?

[gregsrv14]

Page 10-10 says to "Flute the bottom flanges of the bulkhead as required to fit the F-01479 Aft Bottom Skin". There are enormous gaps between the bulkheads and the F-01479 Aft Bottom Skin but I can't seem to close them. You can see from the photos that I tried fluting the outer flange tabs but they did not get any closer.

Also, on Page 10-16, it says to "Dimple the pilot hole in the F-01479 Aft Bottom Skin as shown in Figure 1", then to "Use a rivet to fill the the pilot hole in the F-01479 Aft Bottom Skin as shown in Figure 1". What is the purpose of this?

 

[BruceW]

I dont recall fluting the bulkhead. It can be lined up pretty easy. And fluting the tabs would not do much.
Big thing for me was the curve of the F-01479 is not enough to follow the bulkhead.
I used my weight on the carpeted bench and an inside roller (that I cant remember) to 'guide' the curves of F-01479 a little tighter.
It is a thick skin and does not cooperate much. But I got it closer to the bulkhead curve, and clecos got it the rest of the way in.
This 'messaging' of F-01479 also helps when the side skins go on.

Pilot holes are used in forming the parts in the machines and may not be needed for assembly. Instructions just want you to fill the hole.

 

[mc607]

What is the purpose of this?

The pilot hole is for the tail wheel on the 14. If you’re building a 14A, you’ll dimple and fill it in with a rivet. Now’s a good time to highlight the type of plane, Tri Gear or Taildragger, you’re building and cross out the other to reduce the possibility of mixups. Also, Do Not enlarge the 9/16 and 2-#12 holes until you know where your antennas are going and which type. It’s easy to enlarge them later if you need them. I followed the plans blindly and now I’ve gotta fill those holes in with a cover plate. You can dimple them now, so if you don’t use them they can accept a rivet later. If you do end up using them, the dimples will just get drilled out.

 

[dgarrelt63303]

In some of the spots like this, I fluted between the single tabs to slightly roll up the in between edges. Basically leaving only the rivet area to mate with the skin and providing a flat area big enough for the dimple die to fit.

I don't have any pictures but hopefully the description is good enough to get you there.

 

[gregsrv14]

The pilot hole is for the tail wheel on the 14. If you’re building a 14A, you’ll dimple and fill it in with a rivet. Now’s a good time to highlight the type of plane, Tri Gear or Taildragger, you’re building and cross out the other to reduce the possibility of mixups. Also, Do Not enlarge the 9/16 and 2-#12 holes until you know where your antennas are going and which type. It’s easy to enlarge them later if you need them. I followed the plans blindly and now I’ve gotta fill those holes in with a cover plate. You can dimple them now, so if you don’t use them they can accept a rivet later. If you do end up using them, the dimples will just get drilled out.
View attachment 109003

Oh, bummer. I had already enlarged the 9/16 and 2-#12 holes before posting my questions...

 

[gregsrv14]

In some of the spots like this, I fluted between the single tabs to slightly roll up the in between edges. Basically leaving only the rivet area to mate with the skin and providing a flat area big enough for the dimple die to fit.

I don't have any pictures but hopefully the description is good enough to get you there.

Makes sense. I will give that a try.