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Aerodynamic area ratio asymmetry Available from DDC ballute bow shock breathing and coning breathing frequency canopy inlet canopy shape CANOPY TYPE POROSITY configuration 32 conical shock wave coning angles coning frequency coning motions const Config constructed reefing ratio cross parachute data Present data Decelerators deployment Disk-gap-band canopies Disk-Gap-Band Parachutes double shock-wave pattern downstream shock wave drag and stability drag coefficient increases dynamic pressure equation 11 experimental data Extended skirt extended-skirt canopies Figure 9 geometric porosity hemisflo canopies hemisflo parachute inflated disk inflated reefing ratio inlet diameter investigation Langley Research Center leading edge Mach number modular cross canopy NASA oscillograph photographic data porosity and reefing Present data Present presented in figure ratio and geometric reefing line ribbon flutter stagnation pressure standard flat canopy T3 CD transonic tunnel U.S. Air Force underinflated unreefed Config unreefed parachutes variation of drag varied from approximately wind-tunnel