Part
Component Status
Responsible Engineers
Sustainer Drogue ParachuteDesigning

Lindsey Bjornstad 2022

Preliminary Research

Materials

Geometries

Manufacturing Practices

Testing/Analysis

 

Design

Requirements/Parameters

 

Parameter

Value (ft)

Nominal Diameter

1.5 = 18 in

Nominal Area

1.7671 = 254.46 in2

Geometric Porosity

.2261 = 32.558 in2

Vent Diameter

.105 = 1.26 in

Disk Diameter

1.08 = 12.96 in

Gap Height

.063 = 0.756 in

Band Height

.1815 = 2.178 in

Suspension Line Length

2.55 = 30.6 in

Manufacturing

 

Lessons Learned/Things to Improve for Next Iteration:

  • I think the ends of Kevlar needs to be heat-set

  • The finger-trapping is hard - might need to live with it

  • For the radial reinforcements, we ended up connecting to a square (the vent reinforcement)

  • How to get the suspension lines to be a consistent length

  • Loops should also be pre-marked so they are all the same size

  • Machine does not like straight stitch :( 

  • When we do the zigzag - look into the settings a bit 


Steps

  1. Draw out pattern (we have the paper left over from last time yay!

  2. Cut out octagon and rectangle pieces with extra seam allowance on all sides out of nylon ripstop

  3. Cut out Kevlar and seal ends

  4. Reinforce the edges with Kevlar tape (zig zag) 

  5. Cut out the radial Kevlar reinforcements and seal the ends - mark where the loops should end and fold

  6. Sew on kevlar using zigzag stitch with nylon thread, make sure to have loops on either end

  7. Finger trap the vent line in place

  8. Cut out 39in of thin Technora for lines → lines should be 30.6in

  9. Tie one end in bowline knot to chute → make sure to make first loop then thread through kevlar loop

  10. Mark 30.6in on all lines

  11. Tie bowline loop on end of thin technora lines and check for length of 30.6

  12. Run around and make sure chute works



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