I did originally try to find a way of fitting an O-ring into the slot where the solder would normally fit in the solder ring fitting at the breech (It is the only solder ring fitting on the launcher though, used only because of it's neat fit into the 28mm pipe the breech loader's made from.) Didn't ...

A 3500 psi, custom valved, handheld 1.500 cal. air gun capable of velocities in excess of Mach 3. And on an unrelated matter, I expect to hear on the news that someone was crushed by sheer recoil forces. My main personal aim is to have built an automatic combustion BBMG. I'd also like to have perha...

Silicon grease is pretty good stuff, it will stay in place quite solidly. It's not completely leak free at 300 psi, but it still holds damn well - the leaks at the breech are minuscule compared to the blow-by on many of my projectiles. I wanted a pipe/fitting interface like I have at the moment to s...

It's unlikely that I could generate dangerous recoil, but it's always best to be sure, and well prepared.

I have tried a padded stock before, but it didn't help, so I removed it because it wasn't the most attractive of things.

A mega light piston would help, but not by a lot. I know that HEAL's piston is fairly heavy, but the high pressures and opening forces, along with the piloting valve help negate that nicely.

Bigger is one way of going about it though.

It's 22mm pipe going straight into a 22mm fitting, with the 0.05mm gap packed with silicon grease, but no O-ring. It's practically completely leak-free anyway. I'm intrigued by your claim, but still, you'll have your work cut out beating that valve. It's built with a 22mm fitting internally to incre...

jackssmirkingrevenge wrote:From what I can tell, a single round holds 1,100 tungsten balls 1cm in diameter

That's just damn evil, but it could be useful in a zombie apocalypse.

predictable, aren't I :roll: Very nicely done, particularly the pump. I can't imagine taking a chamber that big past 300 psi with my shock pump. You yourself mentioned how long ago my account was created. I've been lurking for a while. I've done quite a few hydro penetration tests over time, althou...

I'm lucky I don't have one of those, because I cause quite enough problems with only 3/4" ball bearings. The problem may have been that your launcher was relatively light weight compared to the ammo. Firing anything that has over a tenth of the launcher's mass could be problematic. EDIT: Launcher to...

This is "H.E.A.L.", or usually, just HEAL without the periods. HEAL is simply an acronym of the words "High Efficiency Air Launcher". More specifically, it's HEAL v1.3, because it underwent a couple of minor rebuilds, then a pretty major one that changed a couple of things. It cost me about £300, ro...

Despite all the low efficiency worries, I recall you mentioning you were thinking of knocking up a decent one yourself sometime. Is it going anywhere off the thought-board yet? It's still on the thought board. My electronics are a bit shabby, and given the price of some key components in the design...

That is amazing, but kind of pointless for standard spudding uses. You could however make a fully auto recoil based system with this math. It's not quite completely pointless. I know that the launcher I have kicks quite impressively already, so it was worth thinking before firing anything much heav...

Certainly. I'll explain as best as I can. The recoil energy is already (approximately) known, so to get a rough conversion of that into recoil distance, it has to be converted backwards through: Work = Force * Distance. In this case, work is 48.1 Joules. (Note: I'm using metric, as it's easier to wo...

But, then again, it is very hard to get much energy out of a coilgun, full stop. Short of using a diagonal halfbridge configuration, IGBTs, digital timing, at least 1kV, multiple stages and external iron to increase efficency above a pitiful percent point or two, power will be lacking. Not to mentio...

Where is Joanna at right now, by the way? About halfway through a stay in New South Wales. To all you guys who're falling asleep, the maths you see is already somewhat simplified. In reality, you need to calculate for decompression losses after the projectile has left the muzzle, and my original ca...