PR-V4 PDM13 - 25/03/2012

You want to see combustion repeatability. Thrust and pressure levels similar to PDM10.
The test has shown a good accordance with PDM10 and 12. It is the last scheduled test of Promethevs V4.

Acquisition frequency [Hz]: 240
Load cell offset [N]: 0.6
Propellant: P-1
Propellant mass [g]: 173.8
Mean density [g/cm^3]: 1.848
Ideal density ratio: 97.98 %
Grain number: 3
Spacing (between grains) [mm]: 5
Total grain length (without spacing) [mm]: 184.0
Port grain diameter [mm]: 15.82
External grain diameter [mm]: 30.20
Throat diameter [mm]: 8.5
Inhibition: External, final terminated (grain interfaces not-inhibited).
Action time (ta) [s]: 0.271
Burn time (tb)[s]: 0.592
Maximum thrust [N]: 842.5
Mean thrust (tb)[N]: 586
Mean pressure (tb)[bar]: 63.5
Total impulse [Ns]: 222.5
Specific impulse [s]: 122.8

Propellant: P-1
Grain mass [g]: 4.38
Grani length [mm]: 26.9
Port Diameter [mm]: 3
External Diameter [mm]: 11,7

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