Parachute and altimeter vent sizing
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OCTAGONAL PARACHUTE SIZING
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The drag on the rocket is nearly negligible, so this calculation accounts only for the parachute.
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INPUTS
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Total mass after fuel exhausted200grams0.2kg
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Desired terminal velocity10m/s
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OUTPUTS
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flat radius of parachute80mm
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3.2inches
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flat diameter of parachute161mm
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6.25inches
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Air density1.225kg/m^3
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Parachute drag coeff1.75C_d
https://www.grc.nasa.gov/WWW/k-12/VirtualAero/BottleRocket/airplane/rktvrecv.html
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area of parachute0.01830437318m^2
2 m g / (rho v^2 C_d)
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length of octagonal side0.06157077075m
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radius to corner0.08044608878m3.2in
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hollow semi sphere coeff1.42(alternate)
http://www.engineeringtoolbox.com/drag-coefficient-d_627.html
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