Seam allowances marked and panels laid out.
Trimming some of what will be excess fabric to avoid bulk in the center.
Stitching along the full side of two triangles.
The outside - clean side of the sewn together triangles. Repeat 3x.
Laying up the adjacent panel. The object is to get the cut edge - the tip - right up to the already sewn seam.
Laying up the adjacent panel. The object is to get the cut edge - the tip - right up to the already sewn seam. Here the second seam is sewn.
Laying up the next adjacent panel. The object is to get the un-cut edge - the tip - even with the other light blue panel tip - without any bunching - and then sew the seam.
5 done - final piece to add
5 done - one more blue panel to add.
Laying up the final panel. The object is to get the un-cut edge - the tip - even with the other tips - without any bunching - and then sew the seam.
All 6 panels joined. Note the uncut light blue tips are alternately folded along a seam stitch to lay flat and avoid bunching.
Now to reinforce the center joint - the light blue overlaps the purple (cut edge) and will get sewn down. Only 2 layers of fabric here.
This is the second tip sewn down. The first stitch is hidden under the layers. Folded as flat as possible along the stitch line. Note this is forming a cone - so there is bunching in the other folds when flat on this axis. Seam is run out equidistant on either side just for a balanced look from the outside.
Outside view of seam joint sewn flat. Note that this is going to form a cone - so there is bunching on the other axis that is not being sewn presently.
One more stitch added for appearance.
pulling it up into cone shape.
A reinforced triangle joint for 6 panels.
circa 1916 French Military Kite Winch Truck