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Descent Rate Calculator

This tool estimates the descent rate for your rocket rocket as it falls to the ground under its parachute. This calculator is based on the original EMRR calculator by Jordan Hiller.

Enter the weight of your rocket (don't forget to include the weight of the expended motor). Then enter the diameter (or maximum width) and choose the approximate shape of the parachute. Optionally, enter the altitude at which you expect the parachute to deploy.

Rocket Weight
Parachute Diameter
Parachute Shape
Altitude (optional)

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