From 8876656993932d061b12a24f7fac14411b8726b0 Mon Sep 17 00:00:00 2001 From: Bdale Garbee Date: Mon, 6 May 2019 16:31:44 -0600 Subject: [PATCH] initial skeleton of log for first flight using APCP grains I cast myself --- rockets/research/2019-test-2.mdwn | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100755 rockets/research/2019-test-2.mdwn diff --git a/rockets/research/2019-test-2.mdwn b/rockets/research/2019-test-2.mdwn new file mode 100755 index 0000000..af803c9 --- /dev/null +++ b/rockets/research/2019-test-2.mdwn @@ -0,0 +1,30 @@ +# Test 2019-2 # + +This was my first flight with "Everclear". After the 2-grain test stand run, +a quick Burnsim session suggested a 4-grain configuration with #32 nozzle +could work. + +4 grain 54mm Everclear motor with #32'ish nozzle (some crud in the throat +from previous use, largest diameter maybe 0.549"?), using one 45-cal pyrodex +pellet on an e-match for ignition. Flown at NCR North shortly after Jamie +Weiss flew her successful L3 certification flight on 4 May 2019. + +The grains used were from the 7 and 8 January 2019 batches: + +* 8 Jan grain 1, 2.980" long, 162.6g gross, 5.48g casting tube, 157.12g net +* 8 Jan grain 2, 2.970" long, 162.0g gross, 5.46g casting tube, 156.54g net +* 7 Jan grain 3, 2.976" long, 163.4g gross, 5.48g casting tube, 157.92g net propellant +* 7 Jan grain 4, 2.650" long, 146.1g gross, 5.52g casting tube, 140.58g net propellant + +The incomplete/short grain was put at the forward closure end, leaving a bit +of a gap between the propellant and the closure. + +Used abou 13.625" of ARR liner (if using the pressure tap closure, would have +been 13.75, but we needed about 1/8" less to make the normal closure with +o-ring against liner fit). Small profile o-rings were used between grains, +leaving the grains still slightly "loose" in the case. The buna-n o-rings +were lightly lubed, and the liner exterior was greased. + +## Results ## + +PFND. -- 2.30.2