I managed to source this capacitor locally: 270μF instead of the original 300μF but it seems to have done the trick ;D https://i.imgur.com/ThXUFgQ.jpg 270μF instead of the original 300μF but it seems to have done the trick ;D hurrah! https://youtu.be/9LjxU5QbVtE The capacitor came with a resistor be...

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"?

Just a little preview of a cartridge I made to fit a 26.5mm flare gun, here is a rather loud first test with air only at 2500 psi: https://youtu.be/8jp6Ljt730Y (the noise you can hear at the end is the thousands of shattered pieces of cup flying around) Here is the mechanism approximately to scale, ...

As quiet as it is in this corner of the internet these days, I hope everyone's had a good start to 2023!

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.

An empty CO2 capsule averages at around 30 grams, so muzzle energy for those first tests at 2500 psi was in the 45 ft lbs range. In the interest of ramping things up further, I "made" a better projectile by cutting down a 12g capsule to an inch in length, now weighing in at 10 grams: https://i.imgur...

The solenoid you're using probably has very low flow and not dumping the QEV pilot volume effectively.

One possible solution is to add a second QEV, use the solenoid to pilot this QEV which then pilots your main QEV.

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...

Something I acquired recently, a "classic" Coksai/Kokusai CAR-15 airsoft rifle: 20230318_092349[1].jpg It works on the "bullet valve" principle that is relevant to the subject of this thread: bulletvalve.gif Some time in the future I'll do a detailed tear down to elucidate the operating system furth...

Even though it's my bread and butter, my personal airsoft gun collection has never been extensive. I recently found an old (probably made in the early 2000s) Tokyo Marui MP5SD6 however, and to scratch an itch turned it into a 30 round per second CQB machine, complete with the latest in bluetooth-con...

It's been brought up before but apparently not a simple task.

Very interesting and another illustration of how 3D printing is allowing innovation that would have been difficult to flesh out with traditional manufacturing techniques.

It would be nice to see it in action at that rate of fire

I had given the original P17 in this thread away but acquired a new one and thought I'd give it another go, started with the following modifications: 1) cleaned up the valve stem, installed a harder o-ring and drilled out the transfer port to 3.8mm from 2.5mm 2) added a Delrin sleeve to the chamber ...

Rather interesting little creation: