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https://apps.dtic.mil/dtic/tr/fulltext/u2/a246343.pdf

 

Geometry Characteristics

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Images from the Advisory Group for Aerospace Research & Development (AGARD).

https://apps.dtic.mil/dtic/tr/fulltext/u2/a246343.pdf

 

 

Design Trends

High Drag Coefficient is produced by...

  • Decreasing the porosity, which also produces a less stable parachute and a higher opening force.
  • Conical, multi-conical, quarter-spherical canopy shapes.
  • Long suspension lines because they increase the inflated diameter.

 

 

Image Added

 

Images from the Advisory Group for Aerospace Research & Development (AGARD).

https://apps.dtic.mil/dtic/tr/fulltext/u2/a246343.pdf

 

 

S_o = canopy surface area including the vent area and all openings and slots in canopy, ft^2

C_D_o = parachute drag coefficient related to canopy surface area, dimensionless

 

x_o and x_p are interchangeable in this directory.

 

Geometries Compared

This section will cover different parachute designs that are relevant to our use case of the Phoenix drogue. Note: there are many other main types of parachutes that are not included here because their use cases were not appropriate for the Phoenix drogue goal.

Parachute TypeAdvantagesDisadvantagesRanking for Phoenix
Cross  
  • low-cost replacement for the ringslot parachute
  • stable, design decreases oscillation
  • meant too be used more for aircraft, stabilization and slowing down of mines
2 

Disk-band-gap

   3
Hemisflo Ribbon   
Conical Ribbon   
Guide Surface   
Ringslot   
  • good for supersonic deployment up to Mach 3.0
  • useful for drogue application at supersonic speeds
  • hemisflo experiences less flutter and breathing of parachute
  • good performance at higher dynamic pressures
  • Phoenix drogue will not be deployed supersonically, so this is not needed
4
Conical Ribbon
  • good drogue deployment at speeds of M < 1.5
  • good structural integrity
  • stable
  • Apollo and Mercury drogues
 1
Guide Surface
  • good damping characteristics
  • pressure distribution independent of oscillation angle
    • high stability
  • low drag - used for stabilizing payload that is supposed to fall quickly
6
Ringslot
  • useful for decelerating object with large wake behind it
  • more useful for aircraft
5
Ballute
  • optimal for use at high altitudes
  • can withstand supersonic velocities
  • generates a high amount of drag for its mass
  • not useful, not really seen in industry since Goodyear
  • has not been tested that much
7Ballute  



 

 

Common Problems and Solutions

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