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The actual energy of a nail gun like the Paslode cordless XP Framing Nailer is considerable but, as observed, it is a relatively slow expanding, low pressure gas (from the combustion) in a large cylinder. It might be possible for the piston instead of driving a nail to drive a secondary, small...

Sorry for not replaying sooner. Heath issues again and no work or even computer for the last week. Seems that curing one issue can upset other.... I must admit the results did surprise me. Since then I have had only two chances to to run tests with the rupture propagated simply by gradual...

Uploaded a new video: https://www.youtube.com/watch?v=hnmhKNyoKlQ This one includes a link to full details. I am sorry if I was a bit secretive and did not show all the information initially. Maybe now, that it is all disclosed, it does not look that interesting anymore. I doubt very...

I must apologize. There is an error in the results of the test. I've recovered one of the spent bullets and realized I was using lighter bullets for the test. I've machine those bullets in small batches of various sizes and the 23 grams was mixed with the 18.5 grams bullets. So the weight used...

Development of high power air gun. It is a high pressure pre-charged pneumatic rifle triggered by a high-voltage electrical discharge. 0.45 calibre and I am still experimenting with the projectiles. youtube.com/watch?v=3bh1qDong58

I hope to present some results soon. Had a surgery and the recovery was slow, but should soon return to work.

Thank you both Loren and Yoopper. I really appreciated you comments and input and indeed this was my hope when starting this topic; to listen to suggestion and criticism from more experienced members. All the comments you are bringing are very valid and some I've been considering as well. I am...

Thank you again for the encouragement. As mentioned before this is a radically different approach that possibly can allow 1300-1400 fps with 0.45 or 0.357. I did reach those velocities in a test setup (the so called "proof of concept"...) but making a practical gun is a different story and I am...

I completely agree with you. I certainly would not attempt this with existing airguns and so far have been using my 6.5x55. And this is exactly why I am trying to make an air-gun with higher velocity - and unless proven to work well I shall stick with the firearm. As I've indicated I did the...

You can consider getting a Chinese pump from a local supplier, eBay or Aliexprss. Those are about $300.00 (including shipping) and do work well. I got two of those (for two locations) on Aliexpress. One about a year ago and another almost two; both working fine. Search "4500psi Electric air...

Nice. I hope it is not an unrequited love...

What I would like to see are actual field measurements of velocity (or energy) vs distance for real airguns. This data is commonly available for firearms, for example: As for my design: it is difficult to simulate or to calculate the velocity. Conservatively I hope to get some 40% increase -...

Compressed gas cylinders are usually filled to about 2500 psi, so not suitable in application when you need higher pressure. Compressed hydrogen cylinders are available up to 10,000 psi and common in hydrogen powered vehicles. Compressed hydrogen have some interesting characteristics that could...

Thank you, Yoopper. I'll experiment with both .357 and 0.45. It will be nice to switch from my Swedish Mauser to an air rifle - even when I certainly cannot expect the same performance. But I do hope to significantly increase the power over existing air rifles. Or at least this is what is...

 I was thinking along similar lines.I do have good experience with boat-tail bullets in firearms (one of my favourites is the 6.5 mm Swedish.) The 178 gr HP-BT, 35 calbre could be a good start, though I do not mind making, and experimenting with, "wildcats". The idea to make my own design come...

Mountain sheep are sometimes at a shorter range, but 200-400 is not uncommon. 250 seem to be the average.

There is some ambiguity when it comes to "airgun power". Projectile energy is proportional to the bullet mass and its velocity and is usually given for specific guns as muzzle energy; close the muzzle. So a 0.45 heavy bullet can produce some 500 ft-lbs at 700-800 fps a short distance from the...

Yes, I just wanted to clarify some other issues and misconceptions.

I was in the past (in the 80s) making electric triggers for firearms and crossbows where the solenoid plunger will accelerate and release the sear. I preferred to use a higher voltage (E= 1/2 C V2 ), about 300-400V - basically the circuit of a small electronic flash (and I was using the flash...

It is a little more complicated. There is an exchange of energy between the hammer and the release valve and the energy of the hammer is proportional to the mass and velocity ( 1/2 m v2 ). Increasing either the mass or the force of the spring (that will increase the velocity) will give the...