Search found 364 matches

by SPG
Sun Jan 10, 2010 2:34 pm
Forum: Pneumatic Cannons
Topic: preloaded pneumatic cartridge
Replies: 339
Views: 232910

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...
by SPG
Sat Jan 09, 2010 6:08 pm
Forum: Pneumatic Cannons
Topic: preloaded pneumatic cartridge
Replies: 339
Views: 232910

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 mean...
by SPG
Sat Jan 09, 2010 5:59 pm
Forum: Pneumatic Cannons
Topic: preloaded pneumatic cartridge
Replies: 339
Views: 232910

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?
by SPG
Sat Jan 09, 2010 5:50 pm
Forum: Pneumatic Cannons
Topic: preloaded pneumatic cartridge
Replies: 339
Views: 232910

So now you are jumping the gap? :wink:
by SPG
Sat Nov 28, 2009 6:23 am
Forum: Hybrid Cannons
Topic: Quick hybrid piston valve question
Replies: 17
Views: 5944

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 of...
by SPG
Sat May 16, 2009 10:33 am
Forum: Hybrid Cannons
Topic: Liquid fueled hybrid
Replies: 19
Views: 5629

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...
by SPG
Sat May 16, 2009 4:12 am
Forum: Hybrid Cannons
Topic: Liquid fueled hybrid
Replies: 19
Views: 5629

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 ...
by SPG
Sat May 16, 2009 3:46 am
Forum: Pneumatic Cannons
Topic: PCP Guns
Replies: 31
Views: 28313

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 the ...
by SPG
Sat May 09, 2009 8:57 am
Forum: Hybrid Cannons
Topic: First hybrid, help make it a good one
Replies: 11
Views: 3125

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 possibl...
by SPG
Tue May 05, 2009 5:13 am
Forum: Pneumatic Cannons
Topic: Spring Piston Air Rifles
Replies: 39
Views: 10186

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-rifles ...
by SPG
Mon May 04, 2009 8:01 am
Forum: BB, Airsoft, and Pellet Guns
Topic: High Pressure BBMG concept
Replies: 18
Views: 38905

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 the de...
by SPG
Thu Apr 30, 2009 6:45 am
Forum: Miniature Guns
Topic: Micro Gatling Pneumatic
Replies: 17
Views: 8453

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, a...
by SPG
Thu Apr 30, 2009 5:38 am
Forum: Pneumatic Cannons
Topic: QEV pop-off guns plus trigger
Replies: 32
Views: 7408

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 b...
by SPG
Wed Apr 29, 2009 5:50 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Rattlesnake V3 - HPA auto valve
Replies: 105
Views: 46324

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 fl...
by SPG
Wed Apr 29, 2009 4:26 am
Forum: General How-To & Discussion
Topic: Improve your paint pics in 5 quick steps
Replies: 11
Views: 5145

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 thin...