more tests

[web/gag.com] / rockets / research / test5.mdwn

diff --git a/rockets/research/test5.mdwn b/rockets/research/test5.mdwn
index 23f80a1ce2cf9c9f5b539fd5786ea198a1d65595..22979dfd99d6416fd8165c8402f107f5c7025983 100755 (executable)
--- a/rockets/research/test5.mdwn
+++ b/rockets/research/test5.mdwn
@@ -2,12 +2,12 @@
 
 Trying again using KNSO with our new casting bases.  We also have a real
 eye-dropper now for measuring the surfactant.  4 38mm grains of 
 
 Trying again using KNSO with our new casting bases.  We also have a real
 eye-dropper now for measuring the surfactant.  4 38mm grains of 

-1.875" length, using formula of
+1.875" length, 250 gram batch using formula of

 
 

-* 65% KNO3
-* 35% Sorbitol
-* 1% red iron oxide
-* 3 drops Polystep-B1 
+* 65% KNO3, 162.5g
+* 35% Sorbitol, 87.5g
+* 1% red iron oxide, 2.5g, added after melt
+* 3 drops Polystep-B1, added before pour

 
 ## Process ##
 
 
 ## Process ##
 


@@ -65,9 +65,11 @@ Motor          : H170
 
 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
 
 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.
+Little John at Tripoli Colorado Spring Fling 2015.  We used a 
+[Slim Gem](http://www.quickburst.net/slim_gem_igniter.htm)
+igniter from [Quickburst](http://www.quickburst.net/).  Great 
+flight!  The motor seemed to come up to pressure quickly, and burned 
+brilliantly.

 
 The airframe weighed 1200 grams ready to launch, and 982 grams post-flight,
 of which 1g or so was BP in the ejection charge, and a few grams were in 
 
 The airframe weighed 1200 grams ready to launch, and 982 grams post-flight,
 of which 1g or so was BP in the ejection charge, and a few grams were in 


@@ -81,7 +83,9 @@ point.
 
 ## Observations ##
 
 
 ## Observations ##
 

-Pour went really smoothly.  One grain looked "perfect" with the propellant
+Pour went really smoothly.  Easier than previous batches, perhaps due to
+a bit more surfactant, perhaps just getting better, perhaps due to putting
+the mandrels in post-pour.  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 
 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 


@@ -95,4 +99,6 @@ seconds after coming up to pressure.  The regressive curve seems a bit
 exagerated in the flight accel data, which seems completely explainable by
 the nozzle throat erosion causing pressure to faill during that period.
 
 exagerated in the flight accel data, which seems completely explainable by
 the nozzle throat erosion causing pressure to faill during that period.
 

-Pretty cool for our first real flight test!
+The airframe saw an average of 12 G acceleration on the way to Mach 0.6 and
+2838 feet above the laucnh site which is at 8800 feet MSL.  Perfect 
+recovery!  Pretty cool for our first real flight test!