NOTE: The values given in this chart are values obtained from actual tests but values you obtain may vary somewhat due to small dimensional differences and/or propellant densities.
**Prices based on the following: sodium silicate $5.85/gal; charcoal $5.00/5 lb; sulfur $4.50/5 lb; potassium nitrate $8.30/5 lb; bentonite clay $4.65/5 lb; calcium carbonate $4.00/5 lb; 1125 ft roll of 50# Kraft paper $26 (0.77¢/ft2)
Examples of thrust-time curves from actual tested engines.
revised Dec. 1979
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