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Post by bullean on Mar 6, 2020 15:37:25 GMT -5
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Post by londonfan on Mar 7, 2020 7:52:32 GMT -5
I had a look at your reddit post and get your idea through the rough sketch. I'm not a trained professional, but I would have a hard time trusting only gravity to hold the shots firmly in place during the concussion from another one firing. I would be inclined to add a couple of holes to the top plate that would allow the centre section to be filled (at least part way) with sand. I keep a few 20L buckets of play sand in my garage just for this sort of thing. It makes pre-assembled rack units much heavier to carry around, but I feel way safer.
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Post by bigtop on Mar 7, 2020 15:26:53 GMT -5
The question is if 1 of the 800mg flash powder loads in the bangers detonated before it left the tube would it tip over or scatter the other bangers in the rack.
Don't think this can't happen. I have fired thousands of bangers over the years and I have had 2 that blew up right on the ground. It is just a matter of time and odds as to when it will happen. All it takes is a pinhole through the clay that allows the fire from the lift to the flash powder in the load.
When testing Display Fireworks racks the most powerful shell that will be fired from the rack is detonated in the mortar with the other mortars loaded to see if the mortars will remain upright or fall over.
I don't see the gravity to hold the bangers in place as an issue. I have racks that I have tested by detonating 6" shells and 3" salutes. The mortars are held in by gravity. My first thought was that the explosion would blow the mortars upward out of the rack but it does not happen. The force of the explosion pushes the mortars sideways not up.
I can't recommend the testing on your rack design or even your rack because that would be different than the manufacturers directions for use of the firework. The 2 design points that I would suggest are -
1 - have at least 1/2" of space between the bangers in the rack to avoid propagation (when the shock from 1 explosion causes the adjacent explosive to explode).
2 - build the rack with a base that is wider both front to back and side to side than it is tall so it can't tip over.
Your 2 x 2 construction seems sturdy enough as long as it is fastened together well.
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Post by Aussie on Mar 7, 2020 22:25:00 GMT -5
2 x 4 base with a peg board back,
Zip ties hold the object in place.
Break the spike off or leave it on
Matters not to the outcome
Put legs on it and your good to go
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Post by pyrot on Mar 7, 2020 23:01:58 GMT -5
I have one/have built one. It is basically a 2x4 screwed to a 2x6 in a T shape. I just used pipe strapping to hold the shots - i long piece on each side. And the first time I loaded it, I held the shots in place and marked the base(2x6) then drilles a hole in it for the pike to go. Mine can hold 15 on each side. I'll see if I can scrounge up some pictures of it.
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Post by pyrot on Mar 7, 2020 23:09:25 GMT -5
Ok. Sorry. this is the only pic. I can find on my file right now. The rack is in the upper right hand corner. It is painted florescent orange. if you can zoom into it, you can kinda see how it is done. If you want a better pic, I can dig the rack out and take pics of it and post them sometime this week.
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Post by bullean on Mar 8, 2020 18:11:48 GMT -5
Thanks for the ideas and suggestions all. I can't wait to test out various designs and ideas to see how the work.
Also have given me a few more ideas for anchoring, especially for use in areas with harder ground/cement
Either a multiuse design with eyelet that can allow tie off to a brick/sandbag or put stakes through
Or a false bottom that can have a sandbag tossed in or a few paving bricks
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