- 3.1 Compliance
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A model rocket must comply with all specifications in this section and the Model Rocketry Safety Code before, during, and
after flight.
- 3.2 Gross Launching Mass
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The gross launching mass of a model rocket, including model rocket motor or motors, shall in no event exceed 1,500
grams. See also Rule 9.11.
- 3.3 Propellant
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No more than a total of 125 grams of solid propellant materials shall be contained in its model rocket motor(s) at the
moment of launch.
- 3.4 Stages
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There shall be no more than three consecutively fired stages. The staged configuration of the model is considered to be that
of the model at the instant of first motion on the launcher.
- 3.5 Reusability
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A model rocket shall be so constructed as to be capable of more than a single flight; and shall be provided with a means for
retarding its descent to the ground so that its structure may not be substantially damaged, and so that no hazard is created to
persons and property. If a model descends in more than one unattached part, each part must conform to the above
specification.
- 3.6 Materials
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Construction of the airframe shall be of wood, paper, rubber, plastic, or other similar materials consistent with the Safety
Code.
- 3.7 Stability
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Design and construction shall include suitable means for providing stabilizing and restoring forces necessary to maintain a
substantially true and predictable flight path. If required by safety officers or judges, the builder of the model must present
data demonstrating that their model meets this requirement.
- 3.8 On-Board Ignition Systems
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A model rocket possessing a self-contained powered ignition system (e.g., for remote ignition of upper stages) must be
provided with a safety switch or other device capable of preventing actuation of the system and resultant ignition until
immediately prior to the launch.
- 3.9 Dethermalizer
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A model rocket equipped with a dethermalizer or other auxiliary device designed to operate via ignition or combustion must
be designed so that ignition of the device presents no imminent hazard to the person igniting the device. In addition, the
rocket must be designed so that the device is extinguished as soon as possible after performing its function (e.g., by the
inclusion of a snuffer tube).
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