PR-V4 PDM9 - 05/06/2011

Pyrogen test with old P-1 propellant. Complete surface inhibition is kept on grain's ends and interfaces.
Inhibited surfaces prevent combustion on them leading to low thrust and pressure levels and a longer combustion time.
However, thrust curve doesn't match with theoretical predictions of a fully progressive behavior.

Acquisition frequency [Hz]: 60
Propellant: P-1
Propellant mass [g]: 184.9
Mean density [g/cm^3]: 1.840
Ideal density ratio: 97.5 %
Grain number: 3
Total grain length [mm]: 193
Port grain diameter [mm]: 16.2
External grain diameter [mm]: 30.4
Liner mass [g]: 11.1
External liner diameter [mm]: 32.1
Totale mass [g]: 127
Throat diameter [mm]: 8.5
Inhibition: External, final terminated and grain interfaces.
Action time (ta) [s]: 0.75
Burn time (tb)[s]: =ta
Maximum thrust [N]: 497.4
Mean thrust (tb)[N]: 312.7
Mean pressure (tb)[bar]: 33.2
Total impulse [Ns]: 234.6
Specific impulse [s]: 129.4

Propellant: P-1
Grain mass [g]: 4.43
Grani length [mm]: 28.05
Port Diameter [mm]: 3
External Diameter [mm]: 11,8

Environmental data: Atmospheric pressure [mbar]: 1013 Air temperature [°C]: 22