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by hectmarr
Sun Nov 06, 2022 6:11 pm
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Re: A brand-new ignition method

I am sure that what you propose will work well, it is an interesting solution. it must only be ensured that the intermediate rupture disc is destroyed at a pressure greater than the mixture pressure in the higher pressure combustion chamber. The practical limit is when the low pressure chamber needs...
by jackssmirkingrevenge
Mon Nov 07, 2022 9:21 pm
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Re: A brand-new ignition method

If in a closed chamber I manage to introduce propane and compressed air within the range of stoichiometric proportions, at 100 bar, with a proper ignition, will it explode? :? With the right ignition it should, and we have proof :) I don't know if you're aware of this example that was shooting at u...
by hectmarr
Tue Nov 22, 2022 8:35 pm
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Re: Questions about pressure and flow rate

Assuming that there are two combustion chambers A and B, the volume of A is twice that of B, and the initial pressure of B is twice that of A, then theoretically, A and B should use the same amount of fuel, so their calorific values should be the same. Then the question comes, which one, A and B, c...
by jackssmirkingrevenge
Tue Nov 22, 2022 8:37 pm
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Re: Questions about pressure and flow rate

theoretically, A and B should use the same amount of fuel, so their calorific values should be the same. They use the same amount of fuel, but B generates higher pressure and will therefore outperform A by a considerable margin, because projectile acceleration will be greater. Edit: here is a compa...
by jackssmirkingrevenge
Tue Nov 22, 2022 8:34 pm
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Re: Unable to run hgdt.

Have you tried "run as administrator"?
by jackssmirkingrevenge
Thu Jan 12, 2023 11:47 am
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Re: Help for spark plug leakage problem

yyt wrote:
Wed Jan 11, 2023 9:51 pm
Do you think a self-made epoxy spark plug can work better?
I would make something like that:
Untitled.jpg
Using this sort of fitting:
Untitled.jpg
Yellow is a plastic cup or similar insulator, glue to the fitting, stick your electrode through then pour marine epoxy.
by jackssmirkingrevenge
Fri Feb 03, 2023 10:09 am
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Re: Failure to break through 10mm steel plate

picture thread for reference , that is extremely impressive, congratulations! Can it be compared with the 7.62×39mm intermediate rifle bullet? I know that the bullet fired by ak47 can pierce a 10mm steel plate, but the cross-sectional area of the bullet is different, which will affect the penetrati...
by mrfoo
Thu Feb 02, 2023 12:16 pm
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Re: Failure to break through 10mm steel plate

About the only way you're really going to get an idea of muzzle energy is to run it through a chronograph, or if you don't have access to one, shoot into a ballistic pendulum. The latter is very easy to set up; with a mobile phone as camera ad some calculations you can get some very accurate results...
by Jimboishere
Thu Feb 02, 2023 8:33 am
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Re: Failure to break through 10mm steel plate

Mixing number: 150 Projectile diameter: 12mm Projectile mass: 7g Tube length: 100cm Combustion chamber volume: 20cc Target: 10mm a3 steel plate. This is a picture of a 12mm steel ball impacting a 10mm steel plate. The bullet is embedded in the steel plate and cannot be removed. There is a bulge on ...
by Stabilizing Finn
Wed Feb 01, 2023 11:03 am
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Re: Failure to break through 10mm steel plate

This is just a guess but I would say roughly 1100J of energy at muzzle. Few years ago I experimented quite a bit with high mix hybrids and figured out some formulas that can be used to estimate muzzle energy.
by Jimboishere
Wed Feb 01, 2023 7:10 am
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Re: Failure to break through 10mm steel plate

Mixing number: 150 Projectile diameter: 12mm Projectile mass: 7g Tube length: 100cm Combustion chamber volume: 20cc Target: 10mm a3 steel plate. This is a picture of a 12mm steel ball impacting a 10mm steel plate. The bullet is embedded in the steel plate and cannot be removed. There is a bulge on ...
by jackssmirkingrevenge
Tue Jul 04, 2023 11:02 am
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Re: How to replace bursting discs

Have a look at hectmarr's projects, he has done a lot of valuable work in this field.