PR-V4 PDM10 - 11/12/2011

Inhibition only on terminal faces.
Intergrain spacing standardized at 5mm.
We expect to observe a nearly constant thrust curve.

Thrust behaviour as predicted.
Pressure is too high with respect to the theoretical value.

Acquisition frequency [Hz]: 240
Load cell offset [N]: 3
Propellant: P-1
Propellant mass [g]: 179.5
Mean density [g/cm^3]: 1.872
Ideal density ratio: 99.2 %
Grain number: 3
Spacing (between grains) [mm]: 5
Total grain length (without spacing) [mm]: 183.15
Port grain diameter [mm]: 15.85
External grain diameter [mm]: 30.2
Throat diameter [mm]: 8.5
Inhibition: External, final terminated (grain interfaces not-inhibited).
Action time (ta) [s]: 0.51
Burn time (tb)[s]: 0.375
Maximum thrust [N]: 979.8
Mean thrust (tb)[N]: 612.9
Mean pressure (tb)[bar]: 65.6
Total impulse [Ns]: 233.9
Specific impulse [s]: 132.8

Propellant: P-1
Grain mass [g]: 3.82
Grani length [mm]: 26
Port Diameter [mm]: 3
External Diameter [mm]: 11,8

Environmental data:
Atmospheric pressure [mbar]: 1019
Air temperature [°C]: 10