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Thread: Ulrich Bretscher's SMOKELESS BLACK POWDER & HANDGONNE web page. Re-found!

  1. #16
    MIA somewhere in Nam 300CALMAN's Avatar
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    Quote Originally Posted by Carlsen Highway View Post
    I can feel myself moving exponentially closer to blowing myself up.
    Just don't take Port Chalmers with you!
    Cordite likes this.

  2. #17
    Member Micky Duck's Avatar
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    correct potassium nitrate...... and no your local pharmacy or fertilizer store WONT have either sulphur or salt petre but good news is they are for sale on trademe...and look to be finely ground....

  3. #18
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    Have seen the components ground up in a old vitamizer (spelling), the older version of these new smoothie makers, and then combined. Seemed to work OK..... was for a pack howitzer.....and it went bang.
    Please excuse spelling, as finger speed is sometimes behind brain spped........ Or maybe the other wayy.....

  4. #19
    Member Marty Henry's Avatar
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    Garden centre's are a good source of potassium nitrate (stump rotter) and flour of sulphur (organic fungicide) Flour of sulphur needs no grinding either but the nitrate does.

  5. #20
    Member Micky Duck's Avatar
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    Garden centre.....now why didn't I try there LOL

  6. #21
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    Quote Originally Posted by Micky Duck View Post
    Garden centre.....now why didn't I try there LOL
    Amateur...
    Micky Duck likes this.
    Please excuse spelling, as finger speed is sometimes behind brain spped........ Or maybe the other wayy.....

  7. #22
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    Quote Originally Posted by Marty Henry View Post
    Garden centre's are a good source of potassium nitrate (stump rotter) and flour of sulphur (organic fungicide) Flour of sulphur needs no grinding either but the nitrate does.
    There is a better way.... NOt that I know from personal experience.
    The stump rotter is sold in small jars for lots of dosh.
    Try a hydroponics store, should get a big sack for bugger all.
    Marty Henry likes this.
    Use enough gun

  8. #23
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    Quote Originally Posted by 40mm View Post
    There is a better way.... NOt that I know from personal experience.
    The stump rotter is sold in small jars for lots of dosh.
    Try a hydroponics store, should get a big sack for bugger all.
    Expert level.
    Please excuse spelling, as finger speed is sometimes behind brain spped........ Or maybe the other wayy.....

  9. #24
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    Quote Originally Posted by 40mm View Post
    There is a better way.... NOt that I know from personal experience.
    The stump rotter is sold in small jars for lots of dosh.
    Try a hydroponics store, should get a big sack for bugger all.
    Just make sure it is potassium nitrate, not sodium nitrate. Sodium nitrate is hydrophilic and makes your gunpowder moist just through being exposed to atmospheric humidity.

    A sackful... are you planning on powering your 40mm au natural?
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  10. #25
    MIA somewhere in Nam 300CALMAN's Avatar
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    be interesting to see how you get on. I have noticed potassium nitrate disappearing from some of the traditional sources.

  11. #26
    Member Cordite's Avatar
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    Ask your local hunting/gun shop to get it in. It's also used for making sausages!
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  12. #27
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    A research link.

    https://www.researchgate.net/publica...s_compositions

    And abstract in Chinglish, last sentence at odds with Ulrich's findings, but maybe they did not test in a gun chamber:

    "Gaseous phase products and thermodynamic parameters of various charcoal/KNO3 compositions are calculated using the least free-energy principle. From the point of view of reaction kinetics theory, simulation results are analyzed and ratios of compositions optimized. Taking ratio of gas products, force of the powder and temperature of explosion as target functions, low corrosion and environmental-friendly sulfur-free black powders were designed and their thermodynamic properties improved. The physical, chemical and output properties of the optimized compositions compared with normal black powder. Results show that the sulfur-free black powder is more sensitive to flame, and insensitive to impact and electrostatics. The output power is also considerably higher than the normal composition."

 

 

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