Looks good to me, can't wait for the air-powered Bren. One little addition to your piccie above to possibly counter the risk of it going off half-cocked. I take it the pink bit is supposed to push the cartridge forwards to the breech? If you put a weaker spring between the green "firing pin" and the ...

Years ago I went out with someone who had a Lomax, was sweet in an ugly sort of a way (and so was the car).

Should focus on your thing cartridge really, shouldn't I? Looks good though, hope it works, then when you've perfected it I can make hundreds and make an electric belt fed gatling.

In the ...

I know, long time no type. I got sidetracked into building up a Citroen 2CV 4x4 (and thank god given the snow falling outside, and also a plywood canoe and a couple of longbows. Oh and a woman may have had something to do with it to.

4187 new posts to read. I wonder if there's anything good?

So now you are jumping the gap?

I'm not certain why people are talking about enormous forces on pistons, etc.
If you look at the diagram below of a simple coax piston hybrid:

1. Fill with fuel/air behind the piston b.
2. The fuel/air mix bleeds through the equalisation holes in the piston c.
3. The pressure equalises both sides ...

How big a hybrid are you thinking of building? Or to be more precise how much meths are you going to need to put into your chamber? I've got a vague idea involving spool valves, but if it's a small amount then a 3 way ball-valve could work and be much simpler, so because I'm feeling lazy I thought I ...

Why is a fuel injection system so hard to make? You're already dealing with pressurised air after all? Given the huge combustion range methanol has I'd have thought you could pressurise your chamber to say 90% of the pressure you're seeking, then use pressurised air to blow your liquid fuel through ...

why where are you from Syria :idea: :idea: cuz they the only country that have internet but very slow

No if he was in Syria he'd just go buy an AK47 for $20. Seriously there's loads of places too far away from a telephone exchange to get broadband.

Don't forget with any PCP each shot will drop ...

See I'm the opposite I say go for it, forget about people saying you should start simple, just make sure you know about the right materials to use and the right safety measures to take. There's an awful lot of other people's experience you can learn from on here.

I also reckon it's perfectly ...

Actually, I've taken to just using silicon lubricants in my air rifle, because they can't diesel like the petroleum based ones.

Makes maintenance less fussy, because I don't have to be so precise over where I'm getting the stuff.

Me too, everything I ever read as a youngster mad keen on air ...

So years and years of design and development down the tubes cos you bought yourself an HPA tnak?

:roll:

I was looking at airsoft magazines actually but 6mm sucks as a destructive calibre without a readily available supply of heavy hard ammunition, so 0.177" it is :) I've pretty much finalised ...

That's sad, although understandable, there's a huge difference between the capabilities of the brain to come up with something and the capabilities of a couple of old hacksaws and a wonky Dremel to fabricate it.

Keep it in the back of your mind though, let it pop to the surface every now and then ...

Ragnarok, you are, of course, correct. Using the language well does help to give the impression that you know what you're talking about. I will happily give ideas, suggestions, and even critiques of some of the items posted on this forum and not one person has challenged me. In part I hope this is ...

If it was a single shot launcher I would be thinking along the same lines, but when it comes to full auto I'm not looking to make a tack-driver, I would be happy with a 12 inch group at 45 yards.

Thing is, say you had to strike a hypothetical fluid filled container with a 0.177" pellet, it would ...

Great write up, I didn't know about the grid function, and now I do.

One thing I often do for diagrams is draw only half of it. Most spudguns are symmetrical and if you're varying your pipe/fitting sizes within a design I find it much easier to do half, then copy it, paste it and flip it to get ...