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Dimensions for demogorgon flaps:

DemigorgonPattern.PDF

• Sewed to rectangle: 1/2 in tall, 4.172" wide 
• Circumference = 16.6891"
• Diameter = 5.312"
• Flap height = D/2 + .75 (grommet) = 3.406" (can add extra for bulge)
• Flap height + 1.2" sewed part = 3.906"
• Grommet = 1" diameter, flap 1/4" past edge
• Extra fabric for finishing seam = 1/2"
• Width of top of trapezoid = 1.25"

Dimensions for bottom:

Main Bag Circle Pattern.PDF

• Circumference = 16.6891"
• Flaps 1" wide, 1/2" tall

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• Height = 4.5"
• Width = 17.1891"

Manufacturing Process:

Definitions:

Standard Stitch: Size E (69) thread, straight stitch, 2.4 mm stitch length

I - Mark and Cut the Fabric

1. Cut pieces of fabric for main rectangle, lines rectangle, 8 flaps, and the bottom using dimensions and stencils (in deployment bag box) 

II - Make the Demogorgon Flaps

1. Fold over the hem twice. This will use will use a Edge Finish KFb.
2. Pin the hem.
3. Sew hems on flaps by folding edges over twice twice
4. Add grommets to flaps using arbor press. The smaller arbor press inside the shop is preferable.

III - Sew on the Flaps and Tapes

1. Sew flaps to main and lines rectangles
   1. Notes: Try to keep overlap on the same side of the flaps so when they are sewed into a cylinder the overlaps line up. Since the width of the rectangles is slightly longer than four flaps + overlap, spread out the flaps to keep them even.
2. Cut 5 pieces of webbing: 
   1. 3 the width of the rectangles for the top, middle, and bottom seams
   2. 2 loops for the TDs/bridle (pictured above)
      1. 52" long. Mark at 8, 5, 14, 8, 8, and 8
3. Sew the two rectangles together with a piece of webbing on the outside to cover the seam. 
   1. Ideally the line stow would also be sewed in between the rectangles but I forgot, oops
4. Sew the line stow to the lines rectangle, add webbing to reinforce if needed
5. Locking loops?
6. Sew on the webbing for the TD loops
7. Inside out, sew the rectangle into a cylinder
8. Sew the bottom circle on and add webbing over the seam

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The Hermes I bag did not stow or restrain the main parachute suspension lines or riser. There was concern that the unrestrained lines and riser could tangle with themselves or with the various hardware at the confluence. This could have caused the lines to abrade or TODO.

Hermes II Main Bag Improvements

The first generation of the Hermes II main bag was sub-par so we deemed it a prototype. We are making the following improvements to the design.

1. Move the bottom tape towards the mouth to allow for the full seam allowance.
2. Single exterior rectangle.
3. Make wider (and thus shorter)
4. Add loops through closures
5. Remove line holding flap. Replace with rubber bands
6. Add grommet in bottom for bridal to pass through

New Dimensions:

Rectangle:

• Height = 14.875"  Seam allowance = 3/8"

• Width = 17.2" Seam allowance = 1/4" per side
  

Bottom:

Flaps:

• Trapezoidal flaps
• bottom length 4.175"  = circumference / 4

Sources

• Dimensions for main rectangle: