Versions Compared

Old Version 3

changes.mady.by.user Unknown User (jcoray@mit.edu)

Saved on

compared with

New Version 4

changes.mady.by.user Unknown User (jcoray@mit.edu)

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

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.

...

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)

...

Lingard. 09_Supersonic Parachute Aerodynamic Testing and Fluid Structure Interaction Simulation_Lingard.pdf. (n.d.). Retrieved from https://solarsystem.nasa.gov/docs/09_Supersonic%20Parachute%20Aerodynamic%20Testing%20and%20Fluid%20Structure%20Interaction%20Simulation_Lingard.pdf
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