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"Built" is not a typo, I don't have the patience to interrupt the build process with taking AND posting photos, I barely remember just to TAKE the photos, so it's already built. We will see how coherent my memory is.
Start with a 1/8" balsa sheet, 6 inches wide, at least 18 inches long (final length of the blades will be 18".)
Note: I will switch between metric and English frequently, just enough to annoy Everybody!
I recommend using a sharpie or other INK marker to draw the lines. Do NOT use a pencil. Using a pencil is likely to "score" the balsa (some of the lines you will NOT be cutting) and I have learned from experience this weakens the balsa significantly on this model.
At the top, mark a transverse line 2 inches from the top.
Do the same at 16" and at 18". The 2 inch segments will make up the hub section and tail sections of the Rotors.
Take your balsa strip and mark off a 2 inch wide margin at EACH end.
Your first template is a strip of cardboard, 6 inches wide by 1 inch long. (wide and long orientations relative to the where you will use this on the Balsa.)
Mark forward edge of your template at 48 mm, 70 mm, 118 mm, and 140 mm.
Mark the trail edge of your template at 13 mm, 35 mm, 83mm, 105mm.
for the record, I do it this way to get the maximum use of the balsa sheet. Yup, I'm cheap.
Use for forward edge of the template to mark the forward edge of the Balsa sheet and put the SAME marks on the 2" line.
Use the rear edge of the template to mark the 16" and 18" lines.
Connect lines between the front edge and the 2" line. These lines will be straight along the long axis of the rotors.
Connect the lines between the 16" and 18" lines. These lines will likewise be straight along the axis of the rotors.
NOW beginning on the right at the edge (you could call it the "0" mark) of the 2" line, draw a line (it will be slightly oblique to the long axis of the rotors) to the 13mm mark on the 16" line.
Next one goes from the 48mm mark on the 2" line to the 35mm line of the 16" line.
Next one goes from the 70mm mark on the 2" line to the 83mm mark on the 16" line.
Next one goes from the 118mm mark on the 2" line to the 105mm mark on the 16" line.
Next one goes from the 140mm mark on the 2" line to the left EDGE (you could call it 152mm, it is actually a bit longer but works okay for this rocket) of the 16" line.
If I have expressed this right and you did it right, you should have something that looks like the last picture here.
Do NOT start cutting yet!
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