AN-PU propellant

The addition of AP particles within AN-PU propellants increases the burning rate and reduces the pressure exponent without catalysts. The specific impulse is also increased from 225 s to 235 s at 10 MPa by the replacement of 30% AN by the same amount of AP. However, the smokeless nature is eliminated because of the production of HC1, and these propellants are classified as reduced smoke propellants. 

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