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Scott Bryce's Spherical Parachute Patterns

This web page will produce patterns for hemisphere parachutes for model rockets. Instructions for constructing the parachutes can be found in the May/June 2000 newsletter of the Northern Illinois Rocketry Association.

The article describes the construction of 12 inch diameter parachute with 8 gores and a 2 inch diameter spill hole. This web page will produce patterns for other sizes of parachutes. Patterns are limited to a size that will fit on an 8 1/2 x 11 inch sheet of paper.

As you are considering the size of your parachute, keep in mind that a spherical parachute has twice the drag coefficient of a comparable sized parasheet style parachute that comes with most model rocket kits.

Parachute shroud lines should be 1 1/2 times the diameter of the parachute.

Parachute Diameter in inches

Percent of Sphere

50% will produce a hemisphere parachute. 25% will produce a half-hemisphere parachute.

Number of Gores

Spill Hole Diameter in inches

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