Future Consideration listed on Team Wiki for 2018 Disk-Gap-Band Construction:

https://patents.google.com/patent/US6454213B1/en

  • pocket bands

    • Attach to lower canopy of parachute and oriented angularly to with respect to radial lines which allows for increased inflation and as a result, a more rapid deceleration


Block vs. Bias Construction:

https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/prh_change1.pdf


 

Type of Construction

Description

Block

  • Easier construction

  • Smaller Packing

  • Threads parallel to hem of canopy

  • Commonly used today

Bias

  • Stronger (more stretching during opening)

  • Warp and filler threads sewn 45 degrees to centerline of gore

 






Manufacturing Practices for Fruity Chutes:

(https://fruitychutes.com/help_for_parachutes/parachute-help/how_to_make_a_parachute.htm):



















 

Canopy

  • Gores sewn together to form ellipsoid       shaped canopy

  • “Flat-felled” seams used

Spill Hole

  • Spill hole (20% diameter of canopy) reinforced with bias tape

  • Large chutes feature deployment parachute connection loop sewed onto bias tape

Shroud Lines

  • Connection to canopy is triple stitched (for maximum strengthened)

  • Uses Grosegrain tape reinforcement

  • “Hand bag” closure used for shroud connection pattern

 



Common Sewing Patterns:

https://www.apogeerockets.com/education/downloads/Newsletter491.pdf

http://www.madehow.com/Volume-5/Parachute.html


 

Flat Felled Seams

  • Sewing between gores

  • 1 loaded stitch row

  • Standard for ripstop

French Felled Seams

  • Most efficient for radials

  • 2 loaded stitch rows

 



A. French fell seam

B. Needle hem

C. V-tab

D. Outside view of stitched v-tab




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