--- /dev/null
+# Test 5 #
+
+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
+
+* 65% KNO3
+* 35% Sorbitol
+* 1% red iron oxide
+* 3 drops Polystep-B1
+
+## Process ##
+
+The multi-cooker was preheated to about 250F with the lid on. Temp was
+increased during melting to 275F indicated.
+
+Individual casting tubes with fill marks, coring rod inserted after pour,
+cap installed and grain tapped down.
+
+## Results ##
+
+* Grain 1, 51.56g net
+* Grain 2, 52.80g net
+* 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 ##
+
+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:
+<pre>
+Propellant : propellants/knsb.xml
+Nozzle diameter : 0.739 cm (0.291") (19/64")
+Number of grains : 4
+L/D ratio : 5.550
+Port-to-throat ratio : 2.952
+Mass Flux : 1.374 lbs/inch^2
+Mach number : 0.697
+Propellant length : 18.440 cm (7.260")
+Web Thickness (max) : 1.026 cm (0.404")
+Burn rate : 0.773 cm/s (0.304"/s) (a=7.852mm/s; n=-0.013)
+
+Total propellant weight: 216.00 g (7.619 oz/0.476 lbs)
+Average grain weight : 54.00 g (1.905 oz)
+Theoretical density : 1.841 g/cm3 (0.067 lb/in3)
+Actual density : 1.582 g/cm3 (0.057 lb/in3)
+Density ratio : 85.953%
+Specific impulse (Isp) : 106.342 s (estimated)
+Initial Thrust : 169.37 N (38.08 lbs)
+Peak Thrust : 182.21 N (40.96 lbs) at 34.00% (0.45 s)
+
+Kn Ini : 309.48 (488.04 psi)
+Kn Max : 330.39 (520.59 psi)
+Kn Fin : 248.87 (393.56 psi)
+Kn Avg : 309.70 (488.40 psi)
+
+Total Impulse : 225.104 Ns (40.69% H)
+Burn Duration : 1.328 s
+Average Thrust : 169.555 N
+
+Motor : H170
+</pre>
projects / web / gag.com / blobdiff