Locating in Points Space  page 6 
C47 Wing Butt Lines (Start
at FBL 142.000)


Due to the scale of our illustration we will simplify it by eliminateing the thickness of the sheet metal and any protrusions that would become invisible (folds on ribs and L bends and Zbars for the stringers) Begin with the last rib at STA 749.00. Based on the info I have this rib is round and 22 inches in diameter. Create a circle on Layer 1 that is about 0.44 inches (our scale is 0.24 inch = 12 inches therefor each inch is 0.02. 22 inches X 0.02 = 0.44). Use the property bar to correct the dimension. Next create the cutout. The rib is 3 1/2 inches wide so the math goes like this 3.50 X 2 = 7.00, 22 – 7.00 = 15.00, 15.00 x 0.02 = 0.3 inches. Duplicate the original circle and use the property bar to correct the dimension to 0.3.  
We will need more nodes on the larger circle than exist now. Select the larger circle and convert to curves (Ctrl+Q). Marquee select the nodes with the node edit tool (F10) and hit the plus sign on the Node Edit Rollup twice. You now have 16 nodes, which exactly correspond to the stringers in this portion of the aircraft. Marquee select both circles and use the align command (Ctrl+A) to center them horizontally and vertically. Next use the combine command (Ctrl+L) and fill the result with white. The IsoEval or Isometric Menu can now be activated and a Front transformation applied. 
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© 1997  2001 John M. Morris