From 370b5894994bd638993ce0adbc37bdfb198fa44e Mon Sep 17 00:00:00 2001 From: Bdale Garbee Date: Tue, 8 Jan 2019 15:51:22 -0700 Subject: [PATCH] more stuffs --- rockets/research/2018-batch-02.mdwn | 11 +++++++---- rockets/research/2018-batch-03.mdwn | 8 ++++---- rockets/research/2018-batch-04.mdwn | 8 ++++---- rockets/research/2018-test-1.mdwn | 27 +++++++++++++++++++++++++++ rockets/research/2019.01.07.mdwn | 22 ++++++++++++++++++++++ rockets/research/2019.01.08.mdwn | 20 ++++++++++++++++++++ rockets/research/index.mdwn | 6 ++++++ 7 files changed, 90 insertions(+), 12 deletions(-) create mode 100755 rockets/research/2018-test-1.mdwn create mode 100755 rockets/research/2019.01.07.mdwn create mode 100755 rockets/research/2019.01.08.mdwn diff --git a/rockets/research/2018-batch-02.mdwn b/rockets/research/2018-batch-02.mdwn index 12d7600..eed99fe 100755 --- a/rockets/research/2018-batch-02.mdwn +++ b/rockets/research/2018-batch-02.mdwn @@ -24,8 +24,11 @@ These grains were cast on 2018-12-15. ## Results ## -* Grain 1, g gross, g casting tube, g net propellant -* Grain 2, g gross, g casting tube, g net propellant -* Grain 3, g gross, g casting tube, g net propellant -* Grain 4, g gross, g casting tube, g net propellant +Forgot to weigh casting tubes, using average from the next couple batches +instead. Grain 2 visibly under-filled. + +* Grain 1, 195.5g gross, 5.8g casting tube, 189.7g net propellant +* Grain 2, 192.6g gross, 5.8g casting tube, 186.8g net propellant +* Grain 3, 195.3g gross, 5.8g casting tube, 189.5g net propellant +* Grain 4, 201.6g gross, 5.8g casting tube, 195.8g net propellant diff --git a/rockets/research/2018-batch-03.mdwn b/rockets/research/2018-batch-03.mdwn index 2bccfd6..13dbc3e 100755 --- a/rockets/research/2018-batch-03.mdwn +++ b/rockets/research/2018-batch-03.mdwn @@ -21,8 +21,8 @@ These grains were cast on 2018-12-17. ## Results ## -* Grain 1, g gross, 5.78g casting tube, g net propellant -* Grain 2, g gross, 5.82g casting tube, g net propellant -* Grain 3, g gross, 5.78g casting tube, g net propellant -* Grain 4, g gross, 5.80g casting tube, g net propellant +* Grain 1, 198.8g gross, 5.78g casting tube, 193.0g net propellant +* Grain 2, 194.1g gross, 5.82g casting tube, 188.3g net propellant +* Grain 3, 196.6g gross, 5.78g casting tube, 190.8g net propellant +* Grain 4, 201.1g gross, 5.80g casting tube, 195.3g net propellant diff --git a/rockets/research/2018-batch-04.mdwn b/rockets/research/2018-batch-04.mdwn index 3926a7b..69adc54 100755 --- a/rockets/research/2018-batch-04.mdwn +++ b/rockets/research/2018-batch-04.mdwn @@ -21,8 +21,8 @@ These grains were cast on 2018-12-17. ## Results ## -* Grain 1, g gross, 5.78g casting tube, g net propellant -* Grain 2, g gross, 5.87g casting tube, g net propellant -* Grain 3, g gross, 5.83g casting tube, g net propellant -* Grain 4, g gross, 5.79g casting tube, g net propellant +* Grain 1, 193.4g gross, 5.78g casting tube, 187.6g net propellant +* Grain 2, 192.5g gross, 5.87g casting tube, 186.6g net propellant +* Grain 3, 190.8g gross, 5.83g casting tube, 185.0g net propellant +* Grain 4, 195.1g gross, 5.79g casting tube, 189.3g net propellant diff --git a/rockets/research/2018-test-1.mdwn b/rockets/research/2018-test-1.mdwn new file mode 100755 index 0000000..2636426 --- /dev/null +++ b/rockets/research/2018-test-1.mdwn @@ -0,0 +1,27 @@ +# Test 2018-1 # + +7 grain 75mm sorbitol motor with pyrodex pellet ignition in 4-inch Wildman +rebuilt airframe flown on 2 September 2018 at Airfest in Argonia, KS. + +CTI Pro75 6xl case, Loki #50 (long) nozzle with 2 o-rings, CTI forward and aft +closure rings, forward bulkhead from Terry's pile machined to have 0.5" inside +snap ring plus 0.25" inside liner, with two o-rings, one pushing against liner. +Original simulation says this should be a a 34% M-2293 with 6520 Ns total +impulse, 1056 psi max, 76% volume loading, and about 2.25 seconds burn +time. After casting and weighing the grains, the adjusted simulation says +this will be a ... + +## Results ## + +Flown at Airfest in Argonia, KS, off Terry's launch trailer. Motor cato'd +about 0.45 seconds after launch, blowing forward closure through the ebay +and ripping the forward end of the case apart violently. Clearly a +significant over-pressure event. Pretty sure this was the first time I +actually few the Pro75 6xl case with KNSB, and I dialed up the max pressure +at the same time... which was clearly a bad plan. + +The burning grains were sent up in a fireworks-display-worthy fashion, +generally acknowledged as the most impressive-looking CATO of the weekend. + +Flight data logged as sn 3121, flight 5, stored in cato.eeprom. + diff --git a/rockets/research/2019.01.07.mdwn b/rockets/research/2019.01.07.mdwn new file mode 100755 index 0000000..7f31883 --- /dev/null +++ b/rockets/research/2019.01.07.mdwn @@ -0,0 +1,22 @@ +# Batch 2019.01.07 # + +4 Terry-length Everyclear grains for 54mm cases, with 0.5 inch cores, +cast as two 6-inch-long double grains then cut and trimmed. + +This was my first time mixing APCP propellant. Used the 4.5qt mixer and +hand packed with no vacuum processing. The formula was taken from a pdf +about everclear, modified by me to use PAPI as the curative. + +These grains were cast on 2019-01-07. + +## Results ## + +The batch size was too small, there was about 1/4" of the second casting +tube left empty. + +* Grain 1, gross, g casting tube, g net propellant +* Grain 2, gross, g casting tube, g net propellant +* Grain 3, gross, g casting tube, g net propellant +* Grain 4, gross, g casting tube, g net propellant + + diff --git a/rockets/research/2019.01.08.mdwn b/rockets/research/2019.01.08.mdwn new file mode 100755 index 0000000..2d43d37 --- /dev/null +++ b/rockets/research/2019.01.08.mdwn @@ -0,0 +1,20 @@ +# Batch 2019.01.08 # + +4 Terry-length Everyclear grains for 54mm cases, with 0.5 inch cores, +cast as two 6-inch-long double grains then cut and trimmed. + +This was my second time mixing APCP propellant. Again used the 4.5qt mixer +and hand packed with no vacuum processing. Same formula as yesterday + +These grains were cast on 2019-01-08. + +## Results ## + +The updated batch size was just right, there was a bit of excess propellant +so we can make density and burn rate measurements after cure. + +* Grain 1, gross, g casting tube, g net propellant +* Grain 2, gross, g casting tube, g net propellant +* Grain 3, gross, g casting tube, g net propellant +* Grain 4, gross, g casting tube, g net propellant + diff --git a/rockets/research/index.mdwn b/rockets/research/index.mdwn index e50a65c..49d8d1d 100755 --- a/rockets/research/index.mdwn +++ b/rockets/research/index.mdwn @@ -9,9 +9,15 @@ ## Activity Log ## +### 2019 ### + +* [2019 batch 01](2019.01.07.html) - 7 January 2018 - 4 54mm Everclear APCP grains +* [2019 batch 02](2019.01.08.html) - 8 January 2018 - 4 54mm Everclear APCP grains + ### 2018 ### * [2018 batch 01](2018-batch-01.html) - 5 July 2018 - 7 75mm KNSB grains +* [2018 test 01](2018-test-1.html) - 2 September 2018 - 7-grain 75mm KNSB cato * [2018 batch 02](2018-batch-02.html) - 15 December 2018 - 4 54mm KNSB grains * [2018 batch 03](2018-batch-03.html) - 17 December 2018 - 4 54mm KNSB grains * [2018 batch 04](2018-batch-04.html) - 17 December 2018 - 4 54mm KNSB grains -- 2.30.2