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Grain 1: 3.15" @ 219.3 grams
Grain 2: 2.58" @ 177.8 grams
Grain 3: 2.94" @ 206.7 grams
Total Grain Length: 8.67"
Average Grain Length: 2.89"
Total Propellant Weight: 603.8 - 6 inhibitor=596.8 grams/1.3157 Pounds
Grain Diameter: 1.91"
Core Diameter: .79"
Throat Diameter: .375"
Kn: 323, 348, 306
Density: .06393 pounds/ cubic inch
Burn Time: 4.516 seconds
Total Impulse: 188.35 pound seconds
Isp: 143.1 seconds
Peak Thrust: 67.47 pounds
Peak Pressure: ~450 psi
I should note, the calibration on my load cell was off for this test. I knew that going into the test, but it was
a rather raw day, so I decided to go with the calibration as it was. So the numbers from this test are skewed a
bit. I was more curious to see how the propellant would burn with the added Mg. As it turns out, the Mg didn't
seem to increase the burn rate at all. The average burn rate was about .124" per second, keeping in mind the
chamber pressure was quite low. I think the actual Isp would be in the low 120's, with no increase in burn rate.
While that's interesting, it's not totally unexpected. I had similar results when using the finely powdered Mg
in a standard KN/SU propellant too. The Mg almost acts like an inert substance, however, when I used Mg shavings
and larger particles, the Isp then increased. Go figure, it's a mystery to me.
At least it's good to know the Mg didn't give any fantastic results. The 1000 mesh Mg is very expensive and even harder to come by. I just felt compelled to try it.