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- Hems: 0.79in seam tolerance using zigzag stitch
- Gore on Gore seams: using a turned lapped seam, stitch with straight stitch
- Standard for parachutes, hide possibly fraying edges inside the seam itself
- Lines: sewed on after gore seams are completed, sew onto gore seams with zigzag stitch, locked at both ends
- Testing:
- Tensile Testing Seam Construction
- Machine: Instron 5567 Mechanical Testing Machine (50 kN limit)
Lines Diagram:
Lines:
Line: | Material | Length: | Calculations: |
Drogue MPT Riser | Technora, 2,500 lbs capacity | 30 ft | 3 x MPT Length + Motor Length |
Main MPT Riser | Technora, 2,500 lbs capacity | 60 ft | 6 x MPT Length + Motor Length |
Nose Cone Riser | Technora, 2,500 lbs capacity | 15 ft | < Drogue MPT Riser Length |
Main Bag Riser | Technora, 2,500 lbs capacity | 1 ft | < length of MPT coupler section |
Attachments:
- Soft Links
- Purpose: Attaches deployment to risers and risers to suspension lines
- Capacity: 4,500 to 18,000 lbs (variable based on number of loops, loops determined by connection criteria )
- Material: Technora 2,500lbs
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- Material: 316 Stainless Steel
Tensile Testing Preparation:
- Tensile Testing to establish joint knockdown
- Machine: Instron 5567 Mechanical Testing Machine (50 kN limit)
- Grips: Pin Fixture
- Insertion Joint:
- 5” sewed joint w/ 0.5” back stitch on both ends
- Samples:
- 10x Samples of both Technora and Vectran
- 15” gauge length between joints
- Standardized stitching and materials for each type of line (Consistent Lots of thread and line material)
Results
Material Type | Technora (2500 lbf) | Vectran (600 lbf) |
Samples Tested | 10 | 10 |
Standard Deviation (lbf) | 93.8 | 59.3 |
Mean (lbf) | 2023.7 | 545.3 |
Knockdown | 80.9% | 90.9% |