Here is the aft door flange welded in place:
The top door flanges for the cargo door area were made next. The aft
part of this flange runs from the rear door flange(point 4) to point 6 (as
shown in the plans). The flange tapers from point 4 to point 6. Here
it is fitted in place and ready for welding:
Again notice that the straight edge was used to assure that the flange was properly oriented.
Here it is after skip welding. Note that the piece tapers from the width of the flange at point 4 to flat against the tube at point 6.:
The piece that goes from point 6 to point 7 is actually spanning across the gap and doesn't follow the tube. It tapers from flat against the tube at point 6 to the width of the door flange at point 7. This flange is bent into a "U" shape for stiffness. Here it is clamped in place and ready for welding at each end.
Here it is after welding:
The final part of the cargo door flange is the bottom. This one is made from .040 thick steel instead of the .032 used on the other flanges.
The bottom flange tapers from point 3 to 2, then from point 2 to point 1.
As near as I can tell from pictures on the web and from using the
measurements shown in the plans, the bottom door flange is basically a straight
line, tapering from the width of the door flange at point 1 to flat against
the tube at point 3. I ran a string to align the edge of the piece
to as shown below:
This could have been made from one piece but I didn't have a piece of .040 that long, so I made it in two parts.
Here is the aft end of the bottom door flange welded in place:
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