I keep seeing on the Internet news groups that ammonium nitrate propellants have poor performance compared to ammonium perchlorate propellants. Is that true?
A common method of comparing propellants is their specific impulse, abbreviated as Isp. Isp is a measurement of a propellant’s efficiency in producing thrust. The higher the Isp, the less propellant it takes to produce a given thrust level. The figure below shows a comparison of typical ammonium nitrate and ammonium perchlorate propellants.
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