Do you know where they are bought commercially? I'd like to show people that they have an air deterrent project and they need to increase the noise from the markers. If you search for "airsoft amplifier" on places like eBay or Aliexpress you'll find plenty. Other useful key words include "Sound Hog...

I've had this issue with o-ring detents and pellets, the head pops through but then the tail gets stuck on the o-ring.

There are different configurations for balanced valves, this post should be of interest if you haven't seen it already. Most of them have the opposite problem of not reclosing. The solution for that is the same as the spirit of Hector's suggestion, bleeding air from the transfer port in order to for...

There are some commercially available valves as upgrade parts like the Cothran Powerhouse , I had made an animation of how it functions . That particular valve adds a floating element to regulate the "bleed" and therefore valve reclosing, though I'm not sure how much of a difference it actually make...

I recently started looking at this mechanism again and it really is quite interesting. This is the manufacturer's animation: https://i.imgur.com/ufIaLpr.gifv I made my own simplified animation of how I understand it works: https://i.imgur.com/a2DDug6.gif A two-part piston held by a sear seals the br...

Got myself one of these , the cheap and cheerful variation of the HW 40 PCA made of the finest Chineseium. Shoots about 410 fps with a 7.8 grain Daisy flatheads, very pleasant. http://i.imgur.com/mNitYAHl.jpg Naturally I took it apart :D the plan is to convert it to 0.22" and have it shooting as clo...

Added a gravity fed magazine tube to my air soft pistol, tube holds 36, the tube is removeable to leave a small stub which holds 6. A spring loaded sleeve over the barrel slides forward (thumb operated) to open a cutout in the barrel and let one BB drop in, the tricky part was getting the angle and ...

What will be the next step in airguns? Maybe more pressure to achieve more power, or more autonomy? An interesting thought, one can compare to firearms where in spite of the march of technology, there is little difference between the cartridges fired by the guns used today compared to those used in...

I agree with JSR. I wouldn't expect any major revolutions in the airgun world, but instead continued incremental evolution and possibly changing popularity trends. You can already buy a PCP semi-auto that will shoot the wings off a gnat. What would really get me excited is the commercialization of S...

The temptation is always there to "count out" electronics as innovation, but with the energy density (and miniscule internal resistance) of modern batteries getting better and better, things like direct-action solenoid hammers and electromechanical loading could probably (definitely) lead to obscene...

You want the barrel seat (outlet) and the piston to be closer in size for higher opening pressures for a given pilot pressure. To get the cracking pressure of your valve it's just P_c=(P_p*A_p)/A_c, where: P_c=cracking chamber pressure P_p=pilot pressure A_p=pilot area A_c=chamber area So with an 8m...

Ah, so you're using a chamber/outlet sealing design. That makes more sense. So are you trying to find the right sized piston so that you can use equal (before ignition) chamber and pilot pressures and still get opening at an optimal (higher) pressure? If so you could probably play around with GasEq ...

Is this a vented pilot design? I worked the numbers for an 8X mix and a 75% of maximum opening pressure for the piston. Same pressure in the pilot as the preignition chamber pressure. I get a pilot piston diameter of 16.73mm (assuming a 6.5mm piston diameter chamber side), so basically the same as M...

Busy with life so not much in the way of spudding but I did indulge in a bit of lathe time for something a little more artistic for... reasons. Now that I no longer have a laboratory to appropriate concentrated acids from, I tried my hand at salt water etching and while it's not as deep as what I wa...

Does the small o-ring pass over a port while under pressure? If so, it's like running the o-ring over a cheese grater. You might try a different shaped o-ring, such as the X shaped ones. They have much less friction when squeezed, but there would still be friction caused by pressure. They might work...