Merlin Posted July 8, 2014 Posted July 8, 2014 I didnt get my 3 inch shell perfected for this fourth so we just used consumer shells. I know my time fuse was too short on my test shells now and I did not cross match the end on the inside of the shell only in the lift cup portion. It went up really well until it prematurely went off. I destroyed the other test shells realizing something was wrong with the time fusing. I know now I need to increase fuse length and cross match both ends and use an abundance of glue around and in the washer. Having said this I had to painfully resort to consumer shells this forth. 1.75 shells but they performed perfectly. Upon recovering the debris I see that the Chinese shielded their time fuse with a piece of grayish plastic inserted through the hemi. Does the 1/4 inch typical time fuse need shielding? See insert in attach photos/ Let me say without you guys comments I probably would have give up even before making decent BP! Thanks to pyrotechnician and especially grandmaster and all of you.
pyrokid Posted July 8, 2014 Posted July 8, 2014 Priming both ends is important. You can probably get by most times without it but at the end of the day it's a cheap bit of insurance. An very respected pyro told me a story about priming the fire giving end of the fuse. Moral of the story: it's worth it to prime both ends I'm not sure of the value of plastic shielding. I can say that I've never needed to use it. Your plastic shells may be different, as I've never used them. Hope this helps.
Peret Posted July 8, 2014 Posted July 8, 2014 1/4 inch time fuse doesn't need shielding. "Economy" fusing with Visco works if you roll the Visco with several turns of masking tape - note that the Visco must be wrapped all the way through the fuse hole to the outside of the shell. It's always a good idea to take a few inches of whatever fuse you use and time its burn.
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