Dual Deploy Calculator

Size drogue and main parachutes for dual-deployment recovery. Calculates chute diameters, descent times, opening shock, and black powder ejection charges.

Inputs

Rocket mass (kg)

Expected apogee (m AGL)

Main deploy altitude (m AGL)

Drogue descent rate (m/s)

Main descent rate (m/s)

Compartment diameter (mm)

Compartment length (mm)

Tab to move between fields

Results

Drogue diameter (in)

10.3

Main chute diameter (in)

45.6

Drogue diameter (cm)26.1

Main chute diameter (cm)115.9

Total descent time (s)64

Main opening shock (G)29.6

Drogue BP charge (g)1.05

Main BP charge (g)1.57

Landing energy (J)20.3

How to Use This Calculator

Enter Rocket mass (kg), Expected apogee (m AGL), and Main deploy altitude (m AGL).
Set Drogue descent rate (m/s), Main descent rate (m/s), and Compartment diameter (mm).
Adjust Compartment length (mm) as needed.
Review Drogue diameter (in) and Main chute diameter (in).
Use Drogue diameter (cm) and Main chute diameter (cm) to inform your decision.

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