Search found 5401 matches

by Ragnarok
Wed Jan 11, 2017 10:24 pm
Forum: General How-To & Discussion
Topic: "In the world of spuds today"
Replies: 2423
Views: 181440

Re: "In the world of spuds today"

@ jrrdw: That's not an unreasonable suggestion, but in my case, such things are actually fairly obnoxiously priced in limey-land. It's just not the type of thing that's in demand (at least if you want a front/back pair - there are some front bead versions out there for shotguns). Plus, HEAL was alre...
by Ragnarok
Tue Jan 10, 2017 8:33 pm
Forum: General How-To & Discussion
Topic: "In the world of spuds today"
Replies: 2423
Views: 181440

Re: "In the world of spuds today"

I can't comment on anything quite that cheap, as I spent a little more than that - about £12, which is still a very budget model, but it's a fairly robust metal one and at least so far it's seemed to be fairly well suited to the task (and much more convenient than trying to build and calibrate prope...
by Ragnarok
Mon Jan 09, 2017 9:13 pm
Forum: General How-To & Discussion
Topic: "In the world of spuds today"
Replies: 2423
Views: 181440

Re: "In the world of spuds today"

Well, I've finally got around to completing the work on HEAL's stock and sight mount (and got her a proper storage case)... IMG_3434_1600.jpg ... which I'd like to think is something of an improvement over what she looked like 10 years ago . You may notice that I've mounted a unmagnified red-dot the...
by Ragnarok
Wed Jan 06, 2016 6:58 pm
Forum: Pneumatic Cannons
Topic: 19 round Fully auto Gatling gun concept (To be Built)
Replies: 3
Views: 1582

Re: 19 round Fully auto Gatling gun concept (To be Built)

the diverter type of valve In all honesty, I see nothing about the "diverter valve" which would lead me to classify it as something other than a piston valve. Pistons don't have a dictated shape, size or weight - they just can't, unlike in the similar diaphragm valve, be attached to the valve body ...
by Ragnarok
Thu Dec 17, 2015 6:12 pm
Forum: Ammo & Parts
Topic: Fin stabilized and/or sub-caliber ammo?
Replies: 8
Views: 2341

Re: Fin stabilized and/or sub-caliber ammo?

I have nothing in mind numbers wise Well, if you've got any significant distance you may want to reach, knowing that would be a good start as it's then possible to work out a minimum velocity (assuming that you want a relatively flat trajectory, no more than a couple of degrees of elevation) and es...
by Ragnarok
Thu Dec 17, 2015 5:07 pm
Forum: Hybrid Cannons
Topic: A heavy 75x hybrid
Replies: 19
Views: 5141

Re: A heavy 75x hybrid

Will propane survive 75x without auto-igniting or liquefying the propane? Larda ran Hygac20 at 200x, so I'm going to say yes. The partial pressure at 75x isn't enough to liquefy propane (depending on temperature, that happens at around 220x), and the concern with auto-ignition is gas temperature (a...
by Ragnarok
Wed Dec 16, 2015 6:10 pm
Forum: Off-Topic Hobbies
Topic: Drone?
Replies: 6
Views: 1708

Re: Drone?

wyz2285 wrote:hard for a nob
Well that's something not to search on the internet. :shock:
by Ragnarok
Wed Dec 16, 2015 6:04 pm
Forum: Ammo & Parts
Topic: Fin stabilized and/or sub-caliber ammo?
Replies: 8
Views: 2341

Re: Fin stabilized and/or sub-caliber ammo?

Won't work... projectile CG is ahead of the fins, so the projectile will likely tip forward in the barrel and destroy itself. Trust me... ... or I could trust the real-world results. :P [youtube]https://youtu.be/5HrPNdbwqw0[/youtube] The fins are a tight fit in the barrel, and naturally align the p...
by Ragnarok
Tue Dec 15, 2015 8:09 pm
Forum: General How-To & Discussion
Topic: Hydrostatic Shock, anyone?
Replies: 3
Views: 900

Re: Hydrostatic Shock, anyone?

I thought HS was only possible with high velocity rifle bullets, not low velocity homemade airguns. Water is incompressible at any velocity. That's why belly-flopping stings quite so much. Certainly, a high velocity rifle bullet will cause a greater pressure spike when it impacts the water (enough ...
by Ragnarok
Tue Dec 15, 2015 7:59 pm
Forum: Ammo & Parts
Topic: Fin stabilized and/or sub-caliber ammo?
Replies: 8
Views: 2341

Re: Fin stabilized and/or sub-caliber ammo?

I mainly want to aim for range and accuracy. Do you have specific numbers? I've got a on-and-mostly-off project to achieve something similar with a 20mm calibre pneumatic. The original objective was to be able to hit and penetrate a 40cm diameter 6mm mild steel plate at 400 metres (equivalent to on...
by Ragnarok
Sat Nov 28, 2015 10:50 am
Forum: Pneumatic Cannons
Topic: Pneumatic Pressures: The Safe, The Possible, And The Crazy
Replies: 37
Views: 4772

Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Hydraulic fittings are commonly rated to 8,000-10,000 psi, that would be the "sane" limit to me I'd advise against it. Air starts doing very weird things at those pressures, both in terms of how it interacts with other materials and how it behaves on its own. A litre of air in that pressure range s...
by Ragnarok
Thu Sep 24, 2015 8:43 pm
Forum: Pneumatic Cannons
Topic: "Kugel Brecher" Paintball Tank Main Gun
Replies: 6
Views: 2216

Re: "Kugel Brecher" Paintball Tank Main Gun

Should I modify sprinkler to a dual valve for more efficiency? That's probably redundant, as the flexible hose is probably as much of a bottleneck in the system. Is there a way to INCREASE noise? Looking for a good report. Is there a way to increase recoil? Looking for the realism all the way here....
by Ragnarok
Wed Sep 23, 2015 12:17 pm
Forum: Combustion Cannons
Topic: fuel question H2 O2 or Hair spray
Replies: 11
Views: 1926

Re: fuel question H2 O2 or Hair spray

because any launcher that is powered by fuel that is extracted from petroleum is illegal in my city Well, things like deodorant and hairspray burn because they use butane to pressurize the can (or sometimes, don't burn, because some brands don't use butane), so if you're concerned about that, it co...
by Ragnarok
Tue Sep 22, 2015 12:43 pm
Forum: Combustion Cannons
Topic: fuel question H2 O2 or Hair spray
Replies: 11
Views: 1926

Re: fuel question H2 O2 or Hair spray

Oxy hydrogen is the same thing as H2 + O2... You can make it from water. Not however the same as H2O2, which would be hydrogen peroxide. ... which is indeed itself used as a rocket fuel. With the right catalyst, its decomposition rate is approximately "WHOOSHKAFROOGLEAAAARRRRGGGGHHHHIAMLITERALLYONF...
by Ragnarok
Thu Sep 17, 2015 11:26 am
Forum: Pneumatic Cannons
Topic: Cannon Proposal ( M136 AT4)
Replies: 8
Views: 1245

Re: Cannon Proposal ( M136 AT4)

The configuration you have there, if I've read the intent of your diagram right, cannot fire, as the QEV is incorrectly connected. I'd recommend looking at the piston valves explanation topic , as QEVs work on the same principle as barrel sealing valves. The approximately volume of the air tank is T...