This page discusses the details of the "Star" Grain geometry in the Rocket Motor Analysis Module.

A close-up of a segment of the Star grain geometry, with lines of symmetry shown as dashed lines, is shown in the following figure.

The following dimensions required for input are shown:

• Outside Diameter, the exterior diameter of the rocket motor grain
• Interior Diameter, the interior diameter of the rocket motor grain
• Theta E, the angular width of the interior diameter section of the grain
• RF, the fillet radius at the base of the star grain segment.
• Theta T, the angular width of the star segment at half feature height
• RT, the radius of the tip of the star segment.

The geometry input details of the Star grain type will be discussed in detail in the following pages of the tutorial.

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