Marking the body tube....
I have made two marking guides for the Protostars's main tube.
One is for the fins and launch lug, the other for sectioning off areas for simulated riveted panels.
First, I will mark out the lines defining the long sides of the riveted panels. The body tube circumference will be divided into eight sections for these particular details.
Marks are transferred onto the tube from the guide.
The eight lines are extended the full length of the tube.
I am using a metal shelf standard as a line guide. This 'U' shaped strip is ideal, as it aligns easily along the curvature of any body tube. Definitely a huge improvement over the drawer / door sill method.
I must now consult my concept drawing of the Steampunk Protostar.
I note that there are three major sections between the nose and the leading edges of the fins. Each section is defined by a simulated riveted steel band.
A quick measurement of the body tube reveals that I can make each section 3-1/2" in length (that's 89mm for you metric nuts), to get close to the appearance in the drawing.
Using the edge of the marking guide, the lines are traced around the circumference of the tube in the prescribed locations.
Now, the fin and launch lug lines can be marked at the aft end of the tube, using the appropriate guide.
