eye-dropper now for measuring the surfactant. 4 38mm grains of
1.875" length, 250 gram batch using formula of
-* 65% KNO3
-* 35% Sorbitol
-* 1% red iron oxide
-* 3 drops Polystep-B1 (1 drop per 100g being the general idea)
+* 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 ##
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
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!
projects / web / gag.com / blobdiff