The Recovery deployment sequence is "lines first," which has several advantages, noted by Wolf in his Parachute Seminar.
Lines First Deployment Example from Knacke (sourced from Wolf)
We will conduct research into the deployment sequence to mitigate possible failures, ensure a stable descent, and help inform our camera choices.
Chute Inflation
To inform our choice of camera, we need to gather information on chute deployment and inflation rates.
Drogue Parachute Inflation
The rate of drogue parachute inflation will depend on the airstream conditions and the parachute dimensions and its materials. To begin analysis, we examined the NASA TM X-1786 "Wind-Tunnel Investigation of Inflation of Disk-Gap-Band and Modified Ringsail Parachutes at Dynamic Pressures Between 0.24 and 7.07 Pounds Per Square Foot."
- Notably, the chute used in the study (~15 feet diameter) is much larger than our expected drogue parachute (~4 feet diameter)
- Study chute had geometric porosity ~12.5%
Resources
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19690014164.pdf