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Assumptions and Design Goals

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Drogue

Parachute

Lines

Lines Confluence (swivel, ql, etc.)

Riser

Y-Bridle

TD loops

The Hermes II drogue system is designed for deployment at apogee +/- 10 seconds. It is designed to operate at a temperature of 300 F because it could contact the side of the motor case. The current design temperature is arbitrary; it will be updated after a static fire. The deployment conditions are given by sims. Two edge cases were considered (A) a light, powerful rocket launched pointing straight up and (B) a heavy, weak rocket launched at an angle of 10 degrees. Case A gives the maximum mach number at deployment, which is .8. We begin to worry about trans and supersonic effects at or below this number. Case B give the maximum dynamic pressure at deployment. The Hermes II drogue deployment force is lower than the Hermes I deployment force because the rocket is going higher. At higher altitudes the air is thinner, so at the same speed the dynamic pressure is lower.

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