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For the purpose of a simplified analysis, we examined a range of possible main-deployment dynamic pressures (using the chart featured in the Hermes Disk Gap Band Design page as a basis for our analysis). This analysis also made use of the atmosisa Matlab function.
First, we examined the range of possible dynamic pressures, which depends on both the deployment speed and air density (which depends on altitude). For a first-pass analysis, the following ranges of altitudes and Mach numbers were selected:
- Altitude: 90,000ft to 150,000ft
- Mach: 0.5 to 2
Terminology
geometric porosity: the percent of the nominal canopy surface area that is removed due to vents and gaps
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