## Richard Nakka's *Experimental Rocketry* Web Site

### Grain Area Calculations

Propellant grain basic dimensions -- Hollow cylindrical grain (may or may not have frustum)

Outer surface area is given by

Core surface area is given by

Surface area of *each *end is given by

Surface area of the frustum end is given by

Surface area of the frustum is given by

Other terms in the equations are defined as

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