deepakpyro Posted December 16 Posted December 16 (edited) After long time made few shells of 3.5 and 4 inches with flash burst. VID-20241214-WA0024.mp4 Another angle VID-20241213-WA0027.mp4 3.5 inch - crackling microstar commet Size of commet is 22mm - pressed and cut Used rice husks aa bursting charge to reduce the throw of the stars VID-20241214-WA0022.mp4 3.5 inch - Blesser white strobe VID-20241214-WA0020.mp4 4 inch Red & Green stars VID-20241208-WA0008.mp4 3.5 inch Red, Green & crackling star VID-20241214-WA0019.mp4 4 inch - Pumped fast burning red commet with Rice husk burst VID-20241126-WA0005.mp4 Flash burst - 3.5 inch C6 VID-20241214-WA0023.mp4 3.5 inch rolled N1 to red star. Need improvement on the star timings. Flash burst, so not expecting much symmetry Edited December 16 by deepakpyro 2
sachinagg Posted December 16 Posted December 16 (edited) Deepak ji what is composition (for green only) in 4" Red and green shell. All are nice Edited December 16 by sachinagg
deepakpyro Posted December 16 Author Posted December 16 Green star is nitrate based B.nitrate : 53 Sulphur: 5 Metal: 18 ( i have used MgAl as metal here, you can also swap 400 mesh spherical Al as 50:50 with MgAl) - This will add very little tail behind the stars Charcoal: 5 Dextrin: 4 Pvc: 15 You can swap the PVC with Parlon to achieve the colour density but that will also affect the burn rate. 1
SKC Posted December 16 Posted December 16 Very good shells indeed. Have you used flash for lift? If yes can you share composition of flash and flash to shell weight ratio?
Zumber Posted December 16 Posted December 16 Thats not the technical technical way of lifting shells with flash. You must stick with black powder lift.
SKC Posted December 16 Posted December 16 23 minutes ago, Zumber said: Thats not the technical technical way of lifting shells with flash. You must stick with black powder lift. I know composition and process of making black powder that serves my purpose with considerable ease. Anyway, thanks for your statutory warning.😁
Zumber Posted December 17 Posted December 17 They are not reliable all the times and tends to burst lots of them in mortor tubes. Also you may not use same mortor tube as if in case of black powder lift. You may need heavy duty Iron mortor tube for it. Technically it's useless that's the reason why it would be better to follow standard BP lift method.
DavidF Posted December 17 Posted December 17 Some nice stuff there! The crackling microstar comets were beautiful. The red comets were very nice too.
deepakpyro Posted December 17 Author Posted December 17 17 hours ago, SKC said: Very good shells indeed. Have you used flash for lift? If yes can you share composition of flash and flash to shell weight ratio? I am not using flash for list, I use traditional BP for lift. For these shells i have used about 15~20% of unmilled BP to weight of the shell. I determine the weight of BP lift every time for each batch using dead shell lifting. Here is the testing video, 3.5 inch dead shell with 8 second of total air time VID-20241126-WA0000.mp4
Almostparadise Posted December 17 Posted December 17 I second, the crackling microstar comets were sweet! I enjoyed all your shells. Ty for sharing 👍
CountZero Posted December 17 Posted December 17 One time in our teens me and my friend used flash in a small steel mortar, about 25mm id and 3 or 4mm thick steel seamless hydrualic tubing. We only did this once because it ripped the tube open like nothing, good thing we had places it surrounded with tree trunks...
sachinagg Posted December 18 Posted December 18 On 12/16/2024 at 5:18 PM, deepakpyro said: Green star is nitrate based B.nitrate : 53 Sulphur: 5 Metal: 18 ( i have used MgAl as metal here, you can also swap 400 mesh spherical Al as 50:50 with MgAl) - This will add very little tail behind the stars Charcoal: 5 Dextrin: 4 Pvc: 15 You can swap the PVC with Parlon to achieve the colour density but that will also affect the burn rate. Deepak ji which type or which one prime u use for this stars?
deepakpyro Posted 16 hours ago Author Posted 16 hours ago I have used hot prime coating for my stars. Modified the black powder composition with metal to have high flame temperature P. Nitrate- 35 B. Nitrate- 30 MgAl- 12 Sulphur- 15 Charcoal- 10 (above 200 mesh) Dextrin- 4 The formula is over 100% and the result will vary depending on your quality of MgAl(50:50), charcoal and nitrate and your base color formula. I have bought MgAl from a same vendor just few months apart but surprised to see a very different quality of MgAl (30:70) recieved from them. The color stars with red gum as fuel tends to catch fire easily than the formula posted above. Do trail and change the formula accordingly.
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