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Lingard has charts with Cd vs M for a number of geometric parameters (55-58). They range from .3-.6 in the subsonic range, .5-.2 in the transonic range, and .3-.5 in the supersonic range. I'm not sure what all of the geometric parameters are or what Cd is with respect to.
Ubico gives a Cd of .5 with respect to the nominal diameter of the disk. Zero porosity.
In the Lingard presentation, there is a chart, but it seems upside down. Also cites .5-.55 as a Cd range.
Characterize Main
Weather in NM
Air Density Calculator
Main Descent rate for FL1 was 21 ft/s. From delta altitude/delta t.
Dry weight of competition rocket: 50 lb
air density at MDRA: .00245 sg/ft^3. Based on telemetrum pressure and assuming a dry and 46F day.
Size drogue
As of December 12, the mass budget says the rocket will be about 95lb dry.
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Calculate stresses and forces in components
Pick fell and hem types
See Neal & Wellings page 5.
See Poynter.
Calculate design factors
SRB drogue and main design factors (Maydew et al., 131)
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Bollermann, B. (1970). A Study of 30 Km to 200 Km Meteorological Rocket Sounding Systems: Literature and data review (2 pts.) (Vol. 1). National Aeronautics and Space Administration.
Clark, I., & Tanner, C. (2017). A historical summary of the design, development, and analysis of the disk-gap-band parachute. In
2017 IEEE Aerospace Conference (pp. 1–17).
https://doi.org/10.1109/AERO.2017.7943854 Maydew, R. C., Peterson, C. W., & Orlik-Rueckemann, K. J. (1991).
Design and Testing of High-Performance Parachutes (La Conception et les Essais des Parachutes a Hautes Performances) (No. AGARD-AG-319). ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE), ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE). Retrieved from
http://www.dtic.mil/docs/citations/ADA246343 Potvin, J. (2009). Updating and Upgrading the World’s Database on the Opening Shock Factor Ck. American Institute of Aeronautics and Astronautics.
https://doi.org/10.2514/6.2009-2905 Poynter, D. (1984). The parachute manual: a technical treatise on aerodynamic decelerators (3rd ed., completely rev). Santa Barbara, CA: Para Pub.
Ubico, R. E. (1963). FABRICATION AND DELIVERY OF ARCAS SOUNDING ROCKET SYSTEMS EX 6 MOD 0 AND EX 6 MOD 1. ATLANTIC RESEARCH CORP ALEXANDRIA VA.
Neal, M., & Wellings, P. (1995). Design and qualification of the descent control sub-system for the Huygens probe. American Institute of Aeronautics and Astronautics. https://doi.org/10.2514/6.1995-1533