Unique book on Internal Ballistics of Solid Propellants based rockets, prepared in 3 modules of 5 chapters each. Module on Theoretical Ballistics covering theories, derivations, rocket equations under ideal conditions. Module on Predictive Ballistics, with derivations for various propellant configurations, which is not available so exhaustively in any contemporary book. Module on Practical Ballistic s covering static evaluations of rockets, which is generally available in journal articles, only. Each chapter has summary and review questions to make it suitable as textbook. Prepared with 150 illustrations (figures)and answer to numerical. Numerical values of ballistic parameters tabulated as 3 appendixes. Useful for amateur to professionals, researchers to producers, academicians to industries.