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| Variable | Length (in inches) | Description |
|---|---|---|
| hmp | 57.4 | Height of the mission package from nose cone tip to the end of the airframe |
| lmp | 14.5 | Depth into the cup |
| lfc | 7.6 | Depth of booster coupling section |
| hfc | 86.23 | Total height of booster including coupling section. |
| RB | 7.5 | Height of the main deployment bag, not including flaps (should make sure there is enough margin on relevant constraint(s)). |
| DM | 114 (9.5 ft) | Diameter of the main parachute |
| RM | 80.6 | Height of the main parachute (found using 0.707 aspect ratio): RM = DM*0.707 |
| SM | 126 | Length of shroud lines on the main parachute (may change when we update the main) |
| RD | 31 | Height of the drogue parachute (measured on test article 2/15/2018) |
| SD | 100 | Vertical length (accounts for confluence angle) of the drogue shroud lines. Taken from the DGB parameters spreadsheet. |
| FD,D | 17 | Forebody diameter used for drogue parachute shock cord calculation. Please see the extended note on calculation below. |
| FD,M | 29.5 | Forebody diameter used for main parachute shock cord calculation. Please see the extended note on calculation below. |
| DD | 38 | Disk diameter of the drogue parachute. Taken from the DGB Parameters spreadsheet. |
| HTD | 2.7 | Height of the Tender Descender, including 1.5 quicklinks. (Since two Tender Descenders will be used in the calculation below, this will yield the appropriate correct total length) |
| WA,E | 5.4 | There is no webbing between junctions A and E, just two Tender Descenders. Thus, this is calculated by 2*HTD |
| WE,F | This is the total height of the main deployment bag (RB) plus the straps on the top of it.. Placing the junction between the tender descender (TD) and the main chute load paths as far inside the mission package as possible reduces the likelihood that the main parachute will enter the airstream prior to the designated release altitude of 2,000 ft. |
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- Neglect drogue deployment bag as of right now, we will take this into account on calculations further down the line. Or alternatively, there will likely be enough wiggle room with all the lengths that we don't need to worry about it.
- Vehicle dimensions are subject to change
- Main parachute shroud line length are subject to change–I also don't think this value accounts for the confluence angle, so it will actually be a little lower than advertised.
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