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...

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...

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...

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...

Have you tried "run as administrator"?

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:
Using this sort of fitting:
Yellow is a plastic cup or similar insulator, glue to the fitting, stick your electrode through then pour marine epoxy.

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...

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...

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 ...

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.

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 ...

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

jackssmirkingrevenge wrote: ↑

Sat Jun 06, 2020 6:05 am

jimmy101 wrote: ↑

Thu Jun 04, 2020 10:31 pm

Caliper in the fruit isle? Just take a little length of barrel!

"Security? Yeah it's that weirdo putting limes through a pipe again..."

Yeah, that wouldn't look good.

You posted this to hybrid discussion area, but I'm not sure if you are talking about hybrid or combustion because you didn't mention anything about burst disc or pistonvalve. Second thing is that a square tubing is very bad for pressure use. I would not use it with hybrid mixtures. And for the fuel,...