Burning Rate Measurement of KNSu Propellant Obtained by Mechanical Press

Antônio Carlos Foltran, Diego Fernando Moro, Nicholas Dicati Pereira da Silva, Ana Eliza Gonçalves Ferreira, Luciano Kiyoshi Araki, Carlos Henrique Marchi


The potassium nitrate (KNO3)/sucrose (C12H22O11) propellant, known as KNSu, is traditionally used in rocket studies by amateur groups. Performance tests of KNSu, whose composition is 65 wt% KNO3 and 35wt% C12H22O11, cold-manufactured by mechanical press, are presented in this paper. The study determines the behaviour of density (ρ) and burning rate (r) as function of compression pressure (Pc) for the propellant grain manufacturing. Fortyfour samples were prepared and tested, for seven different values of Pc. It was observed that ρ and r depend on Pc, according to quadratic polynomial functions, and the mass flux per unit area is a constant.


Potassium nitrate; Sucrose; KNSu; Experimental rocket motor; Model rockets; Solid propellant

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