The case was approximately 12 inch by 9 feet long, quarter inch wall oil
pipeline steel pipe.24 grade 8 half inch bolts in two rows holding the quarter
inch wall steel retaining ring.The forward bulkhead was a steel plate welded in
the motor case.5 grains of KNSB propellant 20 inch long with the cores varying
from 2.5 inches at the bulkhead to 4 inches at the nozzle We used aluminum
motor cases as our mandrels covered in silicon sheet and greased for
release.The nozzle grain weighed in at 124 pounds with the others slightly
heavier because of smaller cores. The nozzle had a 94% ideal density, normal
density for me is 96-98%
I was up all night Thursday and much of Friday night helping student teams so I
left soon after our 12 inch test.Not sure what caused the anomaly, lots of
speculation and guessing. I'm still investigating the cause.We had two previous
successful 12 inch KNSB sugar tests, one with 2 grains and one with 3 grains.
This test had five grains and was designed to be progressive to test our three
piece safety nozzle.Design pressure at start up was higher than the two
previous 12 inch tests.
Flew a 4 inch KNSB motor just a couple hours before the 12" test UCLA Rocket
Project Avionics & Recovery test
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UCLA Rocket Project Avionics & Recovery test
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https://www.youtube.com/watch?v=jWspWbTCXbM
Rick