Uarbor Posted May 9, 2022 Posted May 9, 2022 Here is a short tester of a crackling waterfall I am working on. Looks like I could use a little baking soda https://youtube.com/shorts/UjgGJY8BQCg?feature=share
SharkWhisperer Posted May 9, 2022 Posted May 9, 2022 Maybe a little; not so much...just make tube longer and hang it higher What's your base comp? How big are the eggs? Tube and nozzle dimensions? Pressed hard or just hand compacted? Waterfalls are cool. Crackling ones even moreso. That mix has promise. Mixed up with some colored stars maybe even a little more??? Wait...colored crackle--now that would be something very cool! Gerbs get short-shrift, but they're a lot of fun to make and you can test many new ideas quickly.
Uarbor Posted May 9, 2022 Author Posted May 9, 2022 Maybe a little; not so much...just make tube longer and hang it higher What's your base comp? How big are the eggs? Tube and nozzle dimensions? Pressed hard or just hand compacted? Waterfalls are cool. Crackling ones even moreso. That mix has promise. Mixed up with some colored stars maybe even a little more??? Wait...colored crackle--now that would be something very cool! Gerbs get short-shrift, but they're a lot of fun to make and you can test many new ideas quickly. the base composition is ball milled airfloat hardwood black powder where's 36- mesh charcoal aluminum flitters and unclassified randomly sized crackle grains three-quarter inch inside diameter tube three and a half inch long with no choke. I plan on using longer tubes with more composition after I get it dialed in a little better. That was at least ten feet off the ground I'm thinking maybe I should point it up slightly instead of downward
SharkWhisperer Posted May 9, 2022 Posted May 9, 2022 the base composition is ball milled airfloat hardwood black powder where's 36- mesh charcoal aluminum flitters and unclassified randomly sized crackle grains three-quarter inch inside diameter tube three and a half inch long with no choke. I plan on using longer tubes with more composition after I get it dialed in a little better. That was at least ten feet off the ground I'm thinking maybe I should point it up slightly instead of downwardNice. Great sparking effect. What % Al & which flitter type/size did you use? K1, K2, 812, or something else? What kind of compaction/consolidation are you using? Except for delays on Estes replicate motors, adding bicarb to decent BP for me can seem like painful abuse of good powder, hah ha. But it does have its uses... Personally I'd probably try screen mixing instead of milling the base BP, maybe with additional charcoal, to slow the burn vigorousness (before trying out bicarb addition). But I enjoy vigorously burning gerbs like yours. Wouldn't want to stand below it, though. Great way to use up crackle scraps, too!
Arthur Posted May 10, 2022 Posted May 10, 2022 (edited) One of Lancaster's methods of slowing BP for larger rocket fuel was to add more charcoal, SO if you add 5% extra charcoal some of that will reduce the speed and some will show as extra charcoal sparks. With a downward facing device, keeping control of the particle sizes lets you control how far the effect will fall and gives you how high it must be to miss the floor. Edited May 10, 2022 by Arthur
Richtee Posted May 10, 2022 Posted May 10, 2022 Damn that’d be cool strapped to a one pound rocket. Hmm...
Uarbor Posted May 11, 2022 Author Posted May 11, 2022 Damn thatd be cool strapped to a one pound rocket. Hmm... wow that is exactly what I had in mind
Uarbor Posted May 11, 2022 Author Posted May 11, 2022 Nice. Great sparking effect. What % Al & which flitter type/size did you use? K1, K2, 812, or something else? What kind of compaction/consolidation are you using? Except for delays on Estes replicate motors, adding bicarb to decent BP for me can seem like painful abuse of good powder, hah ha. But it does have its uses... Personally I'd probably try screen mixing instead of milling the base BP, maybe with additional charcoal, to slow the burn vigorousness (before trying out bicarb addition). But I enjoy vigorously burning gerbs like yours. Wouldn't want to stand below it, though. Great way to use up crackle scraps, too! aluminum is USB 812 from pyrochemsource. I am using my body weight for compaction I started out with 150 g of black powder and I used volumetric measure for the additives it has 1 tbsp crackle grains 1 tbsp aluminum and 1 tbsp charcoal.
Uarbor Posted May 20, 2022 Author Posted May 20, 2022 Damn thatd be cool strapped to a one pound rocket. Hmm... or as the flare in a parachute rocket 🚀 🤔
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