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The goal of this test was to verify the structural and thermal loads on the motor case. A pressure sensor was fitted near the bulkhead protected from hot gases by water. The calculated and corrected thrust is visible in the graph below. A 3-grains geometry was adopted to underload the motor for safety reason.
The pressure measured is much lower than theoretical one. The next test will verify pressure at full load.
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Photo
Acquisition frequency [Hz]: 80
Load cell offset [N]: /
0 voltage Red PS [V]: 2.0862
0 voltage Green PS [V]: /
Propellant: P-1
Propellant mass [g]: 237.7
Mean density [g/cm^3]: 1.904
Ideal density ratio: 98.9 %
Grain number: 3
Spacing (between grains) [mm]: 5.5
Total grain length (without spacing) [mm]: 186.2
Port grain diameter [mm]: 15.8
External grain diameter [mm]: 33.20
Throat diameter [mm]: 10.5
Expansion Ratio Ae/At [/]: 10.5
Inhibition: External.
Action time (ta) [s]: 1.787
Burn time (tb)[s]: =ta
Maximum thrust [N]: 210.8
Mean thrust (tb)[N]: 137.4
Mean pressure (tb)[bar]: 14.4
Total impulse [Ns]: 257.6
Specific impulse [s]: 110.5
Pyrogen:
Propellant: P-1
Grain mass [g]: 5.25
Grain length [mm]: 33.3
Port Diameter [mm]: 3
External Diameter [mm]: 11.6
Environmental data:
Atmospheric pressure [mbar]: na
Air temperature [°C]: na
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