Originally Posted By backbencher: How are you going to get the powder in there?
That's going to be quite the bomb. And the higher pressure goes, the faster even slow powders burn, IIRC.
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Syringe attached to a flexible tube and the air will push up a preload tube of propellant into the cavity then the nozzle is friction plugged.
I am currently working with an engineer to figure out the right nozzle size and wall thickness so it doesn’t grenade. The first simulation grenaded so we beefed up the wall thickness, added support columns, opened the nozzle by x2.5 and reduced the volume to cut down on propellant volume capacity. The concept is proven given the extensive data in the patent, it’s just about figuring out a way to apply that to modern manufacturing techniques and materials.
Here is the new design waiting for trails in the simulator. You can see a drastic change in strength and support
Originally Posted By backbencher: Very interested in seeing how these go. What powder are you planning on starting with, and what pressures are you expecting?
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I bought 20N29 50BMg powder to keep the pressure as low as possible but the simulations were running US 869 powder at between 3k-23k PSI depending on how you calculate it
It’s just hard to calculate when there a lot of variables involved that differ from regular firearms and regular rockets . When we get some test data we’ll have a better image to calculate the PSI pressure