From 379c8282055dc56843ff3a55f7389cad23b3569c Mon Sep 17 00:00:00 2001 From: Bdale Garbee Date: Thu, 23 May 2019 10:08:36 -0600 Subject: [PATCH] capture data on 21 May propellant batch --- rockets/research/2019.01.07.mdwn | 2 +- rockets/research/2019.01.08.mdwn | 37 ++++++++++----------------- rockets/research/2019.05.21.mdwn | 44 ++++++++++++++++++++++++++++++++ rockets/research/index.mdwn | 1 + 4 files changed, 60 insertions(+), 24 deletions(-) create mode 100755 rockets/research/2019.05.21.mdwn diff --git a/rockets/research/2019.01.07.mdwn b/rockets/research/2019.01.07.mdwn index dae4d22..7152a3d 100755 --- a/rockets/research/2019.01.07.mdwn +++ b/rockets/research/2019.01.07.mdwn @@ -1,6 +1,6 @@ # Batch 2019.01.07 # -4 Terry-length Everyclear grains for 54mm cases, with 0.625 inch cores, +4 Terry-length Everclear grains for 54mm cases, with 0.625 inch cores, cast as two 6-inch-long double grains with 0.5" delrin coring rods, then cut, cored, and trimmed as necessary. diff --git a/rockets/research/2019.01.08.mdwn b/rockets/research/2019.01.08.mdwn index 0112b4b..569fa8b 100755 --- a/rockets/research/2019.01.08.mdwn +++ b/rockets/research/2019.01.08.mdwn @@ -1,34 +1,25 @@ -# Batch 2019.01.08 # +# Batch 2019.05.21 # -4 Terry-length Everyclear grains for 54mm cases, with 0.625 inch cores, -cast as two 6-inch-long double grains with 0.5" delrin coring rods, then +8 Terry-length Everclear grains for 54mm cases, with 0.625 inch cores, +cast as four 6-inch-long double grains with 0.5" delrin coring rods, then cut, cored, and trimmed. The 54mm casting tube I'm using weighs 1.84g per inch. -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 +Third time mixing APCP propellant. Again used the 4.5qt mixer and hand +packed with no vacuum processing. Same formula as previous batches. -These grains were cast on 2019-01-08. +These grains were cast on 2019-05-21. ## 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. The excess -weighed in at 17.9g after cure. -* Grain 1, 2.980" long, 162.6g gross, 5.48g casting tube, 157.12g net -* Grain 2, 2.970" long, 162.0g gross, 5.46g casting tube, 156.54g net -* Grain 3, 3.010" long, 164.7g gross, 5.54g casting tube, 159.16g net -* Grain 4, 2.995" long, 163.6g gross, 5.51g casting tube, 158.09g net - -The mass per unit length was within 0.1g/inch, which seems awesome. - -In total for this batch and the previous day's, which were post-processed -together at the same time, there was 10.4g sanded off the grain ends and -64.7g of waste from core drilling the 0.5"-ish holes to 0.625". Really -leaves me wondering if it wouldn't be better to just start with the right -size coring rod for future batches and avoid the coring waste. Might leave -me wanting to rough the cores for better ignition? But, maybe not. Something -to ponder more. +* Grain 1, " long, g gross, g casting tube, g net +* Grain 2, " long, g gross, g casting tube, g net +* Grain 3, " long, g gross, g casting tube, g net +* Grain 4, " long, g gross, g casting tube, g net +* Grain 5, " long, g gross, g casting tube, g net +* Grain 6, " long, g gross, g casting tube, g net +* Grain 7, " long, g gross, g casting tube, g net +* Grain 8, " long, g gross, g casting tube, g net diff --git a/rockets/research/2019.05.21.mdwn b/rockets/research/2019.05.21.mdwn new file mode 100755 index 0000000..cbe221f --- /dev/null +++ b/rockets/research/2019.05.21.mdwn @@ -0,0 +1,44 @@ +# Batch 2019.05.21 # + +A total of 16 Terry-length Everclear grains for 54mm cases, with 0.625 inch +cores, cast as 2 batches of 4 6-inch-long double grains with 0.5" delrin +coring rods, then cut, cored, and trimmed. Grains 1..8 cast by Bdale, grains +9..16 cast by Jamie and Luke with Terry observing. + +The 54mm casting tube I'm using weighs 1.84g per inch. + +Third time mixing APCP propellant. Bdale again used the 4.5qt mixer, Jamie +and Luke used Terry's mixer, all hand packed with no vacuum processing. Same +formula as previously, but with quantities doubled. + +Most materials measured with Bdale's new 600g by 0.01g scale, R45 measured +straight into mixing bowls using Terry's larger scale that goes by 1g. + +These grains were cast on 2019-05-21. + +## Results ## + +The batch size was pretty good, there was a bit of excess propellant in each +batch so we can make density and burn rate measurements after cure. The excess +weighed in at g after cure. + +* Grain 1, " long, g gross, g casting tube, g net +* Grain 2, " long, g gross, g casting tube, g net +* Grain 3, " long, g gross, g casting tube, g net +* Grain 4, " long, g gross, g casting tube, g net +* Grain 5, " long, g gross, g casting tube, g net +* Grain 6, " long, g gross, g casting tube, g net +* Grain 7, " long, g gross, g casting tube, g net +* Grain 8, " long, g gross, g casting tube, g net + +* Grain 9, " long, g gross, g casting tube, g net +* Grain 10, " long, g gross, g casting tube, g net +* Grain 11, " long, g gross, g casting tube, g net +* Grain 12, " long, g gross, g casting tube, g net +* Grain 13, " long, g gross, g casting tube, g net +* Grain 14, " long, g gross, g casting tube, g net +* Grain 15, " long, g gross, g casting tube, g net +* Grain 16, " long, g gross, g casting tube, g net + +The mass per unit length was within ?g/inch. + diff --git a/rockets/research/index.mdwn b/rockets/research/index.mdwn index 1cf9f98..c3ddb9b 100755 --- a/rockets/research/index.mdwn +++ b/rockets/research/index.mdwn @@ -14,6 +14,7 @@ * [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 * [2019 test 01](2019-test-1.html) - 28 April 2018 - 2-grain 54mm Everclear on test stand +* [2019 batch 03](2019.05.21.html) - 21 May 2018 - 16 54mm Everclear APCP grains ### 2018 ### -- 2.30.2