HTPE/PLA Test on 09-23-2022
2 years ago
19
The objective of this test was to examine the effect of an optimum expansion ratio on the coefficient of thrust. The optimum expansion ratio at sea level is ~ 1.7. By cutting off ~ 4 mm from the end of the nozzle, I get an expansion ratio of ~ 1.8. I had a steady average thrust of ~ 19.3 N with a burn time of ~ 4.4 seconds. Ignition occurred in ~ 1.4 seconds. Although I had a really good thrust, my thrust coefficient efficiency was ~ 75%. However, my O/F ratio was ~ 5.2, way to high (theoretical at 2.75). So, there is room for improvement!
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