|Too poor to paint. Too proud to whitewash. Test 1.0 on ERJ propellant, 64-point-05 Feet Per Second|
Slow Pitch Softball, Anybody?
I became impatient. and wanted to see what ERJ Propellant t would do.
I loaded 100 grains, weighed on a balance scale. I used Hornady 50 caliber, 385 grain Great Plains Maxi-bullets (#6620) as the pay load. The launching platform is a CVA .50 caliber "Wolf"muzzle loader.
I measured 64 feet per second which is way below the 1400 fps or so that is my end-point. A detectible hang-fire was observed.
The positive is that it combusted and generated enough pressure to expel the bullet. 8-)
Four potential theories for the gap. Countermeasures are ways to prove/disprove theory.
1.) Powder not completely dry.
Countermeasure: Continue to dry powder and try again in a week
2.) Cornstarch not charred completely enough.
Countermeasure: Make another batch from the beginning. Char until no smoke is being generated.
3.) Granulation too coarse.
Countermeasure: Sift powder to provide uniform granulation.
4.) Formula non-optimal
Countermeasure: Investigate variation in formulation after eliminating 1-3.
The theories are listed in the order given because theories one and two are both consistent with the hang-fires. Theory one requires the least effort to check out.
Theories one and three combine well and theory two is a stand-alone that can be pursued in parallel with (1 + 3).
There is little point if fiddling with formulation until I can get 500fps with no hang-fire.
To be continued