From 675ea814103d9c22fd1ba06c211a485687147ca4 Mon Sep 17 00:00:00 2001 From: Bdale Garbee Date: Sun, 28 Jun 2015 22:11:44 -0600 Subject: [PATCH] add photos --- rockets/research/test5.mdwn | 40 +++++++++++++++++++++---------------- 1 file changed, 23 insertions(+), 17 deletions(-) diff --git a/rockets/research/test5.mdwn b/rockets/research/test5.mdwn index ca27d89..1c82653 100755 --- a/rockets/research/test5.mdwn +++ b/rockets/research/test5.mdwn @@ -24,24 +24,8 @@ cap installed and grain tapped down. * Grain 3, 52.30g net * Grain 4, 51.23g net -## Observations ## - -Pour went really smoothly. One grain looked "perfect" with the propellant -settled evenly and a couple mm of open gap at the top of the casting -tube. We think this one may have been slightly under-filled compared to -the others, all of which had some evidence of propellant sticking to the -cap and leaving an uneven top surface. This resulted in some quick trim -work with a knife, ergo final grain masses not matching all that well. - -## Flight Test ## +## Simulation ## -These four grains were assembled in an AT 38/480 case with a random AT -delay grain from the pile of left-overs, and flown in Robert's Madcow -Little John at Tripoli Colorado Spring Fling 2015. We used a Slim Gem -igniter from Quickburst. Great flight! The motor seemed to come up to -pressure quickly, and burned brilliantly. - -The original simulator data: 
 Propellant             : propellants/knsb.xml
 Nozzle diameter        : 0.739 cm (0.291") (19/64")
@@ -74,3 +58,25 @@ Average Thrust : 169.555 N
 
 Motor          : H170
+ +![simulation data](test5-sim.png) + +## Flight Test ## + +These four grains were assembled in an AT 38/480 case with a random AT +delay grain from the pile of left-overs, and flown in Robert's Madcow +Little John at Tripoli Colorado Spring Fling 2015. We used a Slim Gem +igniter from Quickburst. Great flight! The motor seemed to come up to +pressure quickly, and burned brilliantly. + +![flight acceleration data](test5-altosui.png) + +## Observations ## + +Pour went really smoothly. One grain looked "perfect" with the propellant +settled evenly and a couple mm of open gap at the top of the casting +tube. We think this one may have been slightly under-filled compared to +the others, all of which had some evidence of propellant sticking to the +cap and leaving an uneven top surface. This resulted in some quick trim +work with a knife, ergo final grain masses not matching all that well. + -- 2.30.2