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Summer projects...

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: inonickname » Fri May 21, 2010 10:17 pm

-_- wrote:ahaha wa 2000 are you ganna put fmj and thermal

Oh god, I like the WA2000 but on MW2 it annoys me a lot. I hate the stupid thing. I hate thermal as well, plus bling is a rather nooby perk.

Been building small hybrid rockets (for those who don't know, they use a gaseous/liquid oxidizer and a solid fuel. I use liquid nitrous oxide and a plastic (such as acrylic, HMTB, HDPE etc.) recently. Haven't tried launching one off the ground yet, but the motors work well static testing.
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PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
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Unread postAuthor: Tidbit77 » Fri May 21, 2010 10:19 pm

Fusion Reactor

I'm building a 50kv/5mA supply for the fusion reactor. Building a bottled deuterium injection and metering system for it. Building a 6" spherical stainless steel chamber for it with conflat vacuum hardware. Building a linear ion accelerator based on the magnetron principle to run into that chamber. Building a neutron thermalizer to thermalize neutrons in order to activate silver foil in order to observe the beta decay and prove I am doing fusion. Adding a diffusion pump to the vacuum system, aiming for<.1 millitorr.

Air Cannon
Blowing sh*t up

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Valveless Pulsejet
Refining fuel injectors

BBMG
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Tesla Coil
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Audio Modulate
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"i wonder if i can do that a little lowe- oh apparently no"

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Unread postAuthor: deathbyDWV » Fri May 21, 2010 10:59 pm

Haha, I love how you just couldn't resist putting "Blowing sh*t up."!!!

Just love it. Made me laugh... :D
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Unread postAuthor: Moonbogg » Sat May 22, 2010 1:24 am

I was thinking about simplifying my Striker cannon to use a camlock, and use an HPA tank for fast fueling. I'd have to get an airgun hand pump or something to refill the HPA tank, but at least it would still be mobile and would probably get plenty of shots out of an HPA tank when only fueling to like 4x. The HPA tank will be onboard to replace the O2 tank, so the cannon will still be fully self contained.
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Unread postAuthor: qwerty » Sat May 22, 2010 2:04 pm

I have no idea. Any suggestions? something big.
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Unread postAuthor: Gun Freak » Sat May 22, 2010 2:13 pm

4" piston valve. Is that big enough? :D
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Unread postAuthor: c11man » Sat May 22, 2010 3:54 pm

Gun Freak wrote:4" piston valve. Is that big enough? :D


depends, whats the chamber and barrel?
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Unread postAuthor: deathbyDWV » Sat May 22, 2010 6:26 pm

How about 20 foot x 2 inch barrel and some an evenly large chamber....
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Unread postAuthor: c11man » Sat May 22, 2010 11:16 pm

that is big but not big enough, my summer project is a 4inch piston valve with 3inch poring, over 1500 cubic inch chamber, and a 15ft 3inch barrel.

are you sure that a 20ft barrel is worth it? unless you are shooting a very heavy projectile the last 5ft might now do much good
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Unread postAuthor: Technician1002 » Sat May 22, 2010 11:46 pm

c11man wrote:
are you sure that a 20ft barrel is worth it? unless you are shooting a very heavy projectile the last 5ft might now do much good


I clocked some projectiles in the barrel on some barrels up to 10 feet in length. I saw first hand where the maximum flow for a barrel was achieved and additional length added no acceleration. The added length only added more drag on the air flow. In a 10 foot 2.5 inch barrel max velocity was reached in about 6 feet. Cutting off 3 feet reduced the amount of air the projectile plowed. As a result the projectile continued acceleration all the way to the muzzle. This resulted in a higher muzzle velocity than the longer barrel.

Longer is not always better. Here is a scope trace showing the times a projectile passed pick-up sensors on a barrel 10 feet long. Only the last coils are shown. By checking the distance between blips, you can see that there is very little to no acceleration as the projectile passed these last coils. The very last coil on the muzzle has inverted polarity as a marker.

PM me if you would like to re-create this experiment and record your own barrel trim performance. Procedure is posted on-line.

Image
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Unread postAuthor: qwerty » Sun May 23, 2010 5:00 am

PVC is very expensive in the UK (like £18 for a meter of 4 inch pipe) but... i don't realy know. Finish my semi probably just need the slide valve and a couple of fittings.
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Unread postAuthor: Crna Legija » Sun May 23, 2010 7:08 am

what do you guys play cod on? im on ps3 add wannafuk
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Add me on ps3: wannafuk, 8/11/11 cant wait
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Unread postAuthor: Demon » Sun May 23, 2010 7:31 am

So you are playing call of noobs, modern camping ?

I prefer bad company 2 but i have both (first one came with the ps3)

I am disk_error
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Unread postAuthor: Mr.Sandman » Sun May 23, 2010 10:20 am

I have 3 projects i plan on doing. The first is LRR which I have finally decided will be a .375 caliber pre charged pneumatic operating at 850-1000 psi.

My 2nd project is a bit undecided, but i am hoping to build a pre charged pistol but im am not 100% on that. Finally I will finish my aircane and see if i can make a nice wooden handle to hide the pilot which will be a schrader valve.
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Yeah, it's that important.
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Unread postAuthor: Zeus » Tue May 25, 2010 6:42 pm

I can't say I've any summer projects but I do have two winter projects.

1. Get into the course I appplied for.

2. Actually BUILD something!
Maybe a small burst disc pneumatic with can be converted to hybrid.

(I'm enjoying very late autumn right now, looks like I have another
reason not to touch PVC, I don't need one though.)
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