In davis's book it's stated that sulphurless powders do burn more slowly compared to normal BP but this may not be a bad thing.
Sulphurless powder allowed the use of bigger guns becouse when the powder is first ignited it burns slowly but as the presure rises so does the burning speed of the powder.
The slower burning allowed for construction of bigger but not so heavy guns, the guns had thinner walls which reduces weigth.
Sulphurless powders were the most succesful form of black powder to be used in rifled guns at long ranges.
It should also be noted that sulphurles powders were used in forms of special grain designs, single-perforated hexagonal prisms, which allowed for faster burning as it burned from the inside out and the outside in.
And the 3x times faster than BP theory, i guess it's true. The rate of burning is measured by taking a sample of the powder and sealing it into a "tube that should not be used in pyro" and igniting then measuring the velocity of explosion. Also, don't you think it's a bit weird that BP should burns at the speed of ~350m/s, i for one never get a powder that fast. 350m/s is the velocity at which it explodes at.
I hope that this clears things up a bit
Yes that does clear allot of things up thank you.
I attempted more sulfurless BP this afternoon using the precipitation method 3:1 seemed to be going well until I added the Balsa charcoal, I think I'm ready to give up with it, it's just so porous I can't manage to kept it a soupy consistency.
