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The Algol III is a new high-performance solid rocket motor developed for use as the first stage of the NASA SCOUT-D and -E launch vehicles. The motor delivers a 30% gain in total impulse over its predecessor and provides a 35-45% gain in payload mass capability at a fractional increase in cost. Algol III has successfully completed development and qualification at United Technology Center under contract to LTV Aerospace Corp.'s Vought Missiles and Space Co., the SCOUT prime contractor for the NASA Langley Research Center. During this two-year program, two development and three qualification motors were successfully static-tested. The motor is 45 in. in diameter, has a length-to-diameter ratio of 8:1, and delivers an average of 100,000 lb of thrust for an action time of 72 sec.