http://www.armadilloaerospace.com/n.x/Armadillo/Home/News?news_id=232
Solvay Ultra-Pure works fine for our mixed-monoprop system.
Re: your invisible plume issues, since you guys have such an electronics bent, maybe you could try putting an IR filter on your closeup video camera- there may be enough 800-1200 nm emission to make shock diamonds etc show up.
Utterly unrelated, I found a very useful Excel add-in at <http://www.unit-conversion.com/excel.htm> which makes even complex unit conversions such as Mpa.kg/m3 to psi.lb/in3 (should you wish- shudder) with only three cell references. It's like the stock CONVERT function, but much more capable. Good stuff.
Doug Jones
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