View Full Version : 4'' lift charge problem
whitepyro
04-24-2011, 06:20 PM
hey everyone
im about to carry out a test for lift charges on my 4'' shells by using dummy shells that weigh the same as a complete shell mine are about 350g - 380g after pasting . any recommended lift amounts in grams would be helpful before i carry out the test ,cheers
ps i used 100g last time and it wasnt enough
NightHawkInLight
04-25-2011, 12:30 PM
The black powder you're using must be terrible. It should take an absolute max of 35g to lift a 380g shell. Mill the BP longer, use a better charcoal, granulate it. You are using a scale to measure your chemicals correct? Volumetric measuring would also be a cause of slow BP.
You can also improve how your shells lift by making them a closer fit in the mortar. In addition, confine the lift better. Add several layers of paper over it and it will reach a higher pressure in the gun. That will only help so much though.
whitepyro
04-25-2011, 05:50 PM
i never tested that certain batch of powder because it was an emergency that i needed it.scales are crap yes but my willow charcole seemed to be the better choice of pine . Ive just fixed my mill so it should be better for the next batch after i get new scales. thanks for the info .
pyros
04-27-2011, 09:04 AM
Hey there!
Under normal "one-break" 4" shells I use about 40g of lift, a little bit coarser then normal, I like a little bit more "volume" of powder grains under my shells, it's not so violent as fine one and gives a good consistent height that the bomb is going :)
whitepyro
04-27-2011, 11:34 PM
ill see what my dummie test says with some decent powder.haha
arial-shellz-R-US
06-20-2011, 01:27 PM
haha 100 grams... that would send a 4 inch shell to the moon... try 35-40 grams of GOOD BP
whitepyro
06-22-2011, 02:06 AM
yeah its sorted now
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