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XL-9: 65% granular KNO3, 24% granular Xylitol, 11% powdered Sucrose
For this batch I cut back the sugar to 11%, it was mixed the same as previous batches. The dry powder melted quickly,
I stirred and monitored the temperature. At 225(F) I turned off the heat. If the sugar indeed is disolving in the
melted xylitol, there is no reason for further heating. It will be interesting to see how the cured grain is affected
by the reduced heat. I also used granular KNO3 and xlyitol in this batch. I don't think the xlylitol matters what
form it is in, but the granular KNO3 results in a much more pourable melted propellant, the slight loss of Isp
may well be offset by better density of the less viscous molten propellant.
Here is the grain numbers:
1) 2.73" at 116.0 grams
2) 2.955" at 128.3 grams
3) 2.86" at 126.3 grams
4) 2.975" at 131.6 grams
Total Propellant Weight: 498.2 grams, 1.09834 pounds
Total Grain Length: 11.52"
Density: 0.0656 lb/ci
Kn: 249 initial 289 maximum
Burn Time: 1.566 seconds (A lot of late low level thrust)
Peak Thrust: 204.6 pounds
Maximum Estimated Pressure: ~1,050 psi
Total Impulse: 129.94 pound seconds
Isp: 118