Use a check valve instead of a baffle to stop the high pressure flow from the secondary combustion chamber back to the primary, and see what happens to the performance

This is a picture of a steel plate.

Combustion chamber volume: 100cc Barrel diameter: 15mm Barrel length: 100cm Fuel: Liquefied petroleum gas Combustion aid: air with 40% oxygen content Multiple:70× Projectile: 15mm steel ball Bursting disc: 3 circular iron sheets with a thickness of 0.3mm How much energy do you think this blow contai...

I couldn't get propane and had to use butane instead, but butane seems to have a much lower liquefaction pressure than propane, when I add pressure it will be liquefied, can butane still be ignited at this point?

I'm considering semi-automatic supercharged combustion, but I can't replace the bursting disc quickly. Is there any solution?

Stabilizing Finn wrote: ↑

Wed Feb 01, 2023 11:03 am

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.

What is the formula? Can they exceed the accuracy of hgdt?

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 result...

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 ...

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 t...

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 t...

jackssmirkingrevenge wrote: ↑

Sat Jan 21, 2023 4:53 pm

the maximum working pressure of my needle valve reaches 400mpa

Ah, but what's the maximum working temperature?

I don't know its maximum working temperature, but it is a metal hard seal, so I think the temperature should have little effect, which may be a product quality problem.

这是它的照片。在几次150次射击后，它变得无法保持密封。

I can't understand that the initial pressure of 150× and the theoretical explosion limit pressure should be less than 110mpa, but the maximum working pressure of my needle valve reaches 400mpa. Why did it fail?