...
Then, we can generate the following graph of inflation times based on velocity:
Stages of Parachute Inflation
- Line Snatch:occurs upon line extension right at the start of parachute inflation; forces during inflation outweigh the snatch force (Potvin and Peek)
- Note that this source relates to skydiving applications which include sliders that affect the deployment sequence. Thus, things may be different for rocketry.
Terminology
geometric porosity: the percent of the nominal canopy surface area that is removed due to vents and gaps
Resources
Potvin and Peek, Parachute Opening Shock Basics
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19690014164.pdf