Test 2019-4

This was a 3-grain 54mm Everclear motor using a #24 nozzle. Ignition was with one of Terry's igniters, on Saturday at the Tripoli Colorado Spring Fling event near Hartsel.

The grains used were from the 21 May 2019 batch:

• 21 May grain 5
• 21 May grain 14
• 21 May grain 7

Small profile o-rings were used between grains, leaving the grains still slightly "loose" in the case. The buna-n o-rings on the nozzle and forward closure were lightly greased, and the liner exterior was heavily greased.

Results

Test stand data in 2019-05-25-serial-3634-flight-0030-4.eeprom.

There was a fairly significant liner burn-through in the middle of the first grain near the nozzle, burned-looking area was dime-sized, with maybe 1/4" "hole" in the middle. Some extra ash on case there, but no obvious signs of weakening of the case. Not sure what that was caused by?