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Descent Characteristics

Reynolds Number Regime

Relative Descent Dynamics

Booster Section

Assuming we are falling horizontally with flow conditions above the critical Reynolds number, we expect a drag coefficient (based on diameter) around 1.6. [1] This gives us a CdS of 0.53 m2, given a diameter of 6 in = 0.1524 m and a length of 85.73 in = 2.178 m (this neglects the fins). If we are falling vertically, we expect a drag coefficient of around 0.8 [2]. Given a reference area of a circle with diameter 6 in (π*(0.0762m)2 = 0.0182 m2), we find that the CdS is 0.0146 m2.

Drogue

The drogue has a CdS of (this is at Mach 0.137) 0.662 m2.

Descent/Landing Rates

Resources

[1] DRAG OF CIRCULAR CYLINDERS FOR A WIDE RANGE OF REYNOLDS NUMBERS AND MACH NUMBERS

[2] Aerospaceweb.org, Drag of Cylinders and Cones