PR-V4 PDM8 - 15/05/2011

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-2
Propellant mass [g]: 116
Mean density [g/cm^3]: 1.539
Ideal density ratio: 82.7 %
Grain number: 1
Total grain length [mm]: 137
Port grain diameter [mm]: 16.03
External grain diameter [mm]: 30.94
Liner mass [g]: 11.1
External liner diameter [mm]: 32.1
Totale mass [g]: 127
Throat diameter [mm]: 8.5
Inhibition: External, final terminated.
Action time (ta) [s]: 1.683
Burn time (tb)[s]: =ta
Maximum thrust [N]: 62.3
Mean thrust (tb)[N]: 48.9
Mean pressure (tb)[bar]: 5.4
Total impulse [Ns]: 84.4
Specific impulse [s]: 72.4

Propellant: P-1
Grain mass [g]: 4.74
Grani length [mm]: 29
Port Diameter [mm]: 3
External Diameter [mm]: 11,82

Environmental data:
Atmospheric pressure [mbar]: 1010
Air temperature [°C]: 18