Model Rocket Specifications

« Introduction

3.1 Compliance

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

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

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

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

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

Construction of the airframe shall be of wood, paper, rubber, plastic, or other similar materials consistent with the Safety Code.

3.7 Stability

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

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

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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