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Short question topic

A place to ask general spud cannon related questions.
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Re: Short question topic

Unread postAuthor: Cthulhu » Tue Mar 06, 2018 1:21 am

jackssmirkingrevenge wrote:What mixes do you intend to go to?

Since I'm just using home Depot steel pipe, I don't want to go past 8x
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This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Tue Mar 06, 2018 7:08 am

In that case you're probably fine tapping a spark plug directly into an endcap providing it's thick enough.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Short question topic

Unread postAuthor: wyz2285 » Fri Mar 09, 2018 10:29 am

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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: hectmarr » Tue Mar 13, 2018 6:42 pm

What precautions must be taken to cut a .22 cannon in half? Can it be cut simply? or is not recommended? :?
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Re: Short question topic

Unread postAuthor: farcticox1 » Tue Mar 13, 2018 6:49 pm

You mean to cut the barrel in half?

download.jpg
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Re: Short question topic

Unread postAuthor: hectmarr » Tue Mar 13, 2018 7:26 pm

farcticox1 wrote:You mean to cut the barrel in half?

download.jpg

Yes. I have a barrel.22 and 18 "and I'm in need of that same cannon for a short weapon ....
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Re: Short question topic

Unread postAuthor: hectmarr » Tue Mar 13, 2018 8:01 pm

Solved. :bounce: I found a short video explaining how to do it. I leave it in case someone ever wants to do it.
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Re: Short question topic

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Re: Short question topic

Unread postAuthor: jrrdw » Thu Mar 15, 2018 2:25 pm

L0L, I ran across that very video some time ago doing research.
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Re: Short question topic

Unread postAuthor: hectmarr » Thu Mar 15, 2018 2:39 pm

I found it by chance, after getting tired of looking for information on this topic, that's why I asked here. It's Murphy's Law :(
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Re: Short question topic

Unread postAuthor: jrrdw » Thu Mar 15, 2018 2:47 pm

hectmarr wrote:I found it by chance, after getting tired of looking for information on this topic, that's why I asked here. It's Murphy's Law :(


Normaly yea.
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Re: Short question topic

Unread postAuthor: zackass1 » Tue Apr 24, 2018 12:31 pm

Do You guys use sealing washers between QEV and chamber/pilot/barrel? I have bad time with teflon tape. Hemps with sealing paste works sort of but I dont think that is good idea to use them with pressures like 10-15 bar.
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Re: Short question topic

Unread postAuthor: farcticox1 » Sat Apr 28, 2018 5:56 pm

I use this

dope.jpg
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Rated at 10,000psi :shock:
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Re: Short question topic

Unread postAuthor: farcticox1 » Sun Jun 17, 2018 7:11 am

At what pressure is HPA (High Pressured Air)
https://www.airsoftgi.com/Airsoft-Guns- ... t-Guns-854
considered to be not high pressure? Or is any pressure above atmosphere considered HPA :shock:
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Sun Jun 17, 2018 7:19 am

Polarstar type airsoft guns use HPA tanks (3000-4500 psi) that typically have a regulated output of 300-850 psi and are further brought down by a second regulator to 120 psi or less for the air engine.

Apparently (at least in the ballistic field) this terminology comes from the paintball industry:

Different sports, different terminology. HPA was coined by the Paintball Industry , with evolved from "Nitro" tank usage. Regulators used by the paintball industry up until about 1996-1997 were all 850PSI (aka "HPA" for compatibility with CO2 guns). But then Tom Kaye (of Airgun Designs, and Shoebox Compressor fame) came up with a paintball gun which ran at 1100-1200PSI (aka SHP): The AutoMag RT, which was a Compressed Air ONLY design. However, some folks took a different tack, and started building and setting up paintball guns operating at lower pressures (350-450PSI aka SLP). With Airsoft taking off in the USA, some people started converting Green gas guns to Compressed air using Low Pressure regulators (~100-150PSI aka LPR). PCP guns before about 2000 ran from 1000 to 2900 PSI; when the "Simple Simon"/USFT came out, many were surprised to learn it was only a 1400PSI gun (with a very large reservoir).

LPR= "Low Pressure Regulator" 100-150PSI (LRPs are actually secondary regulators...they can take no more than about 1000PI input pressure, there are a few ULP "Ultra Low Pressure Regulators which regulate to 100-250PSI from 3000
PSI input pressure), SLP = "Super Low Pressure" 250-350PSI, SP = "Standard Pressure" 750-950PSI, SHP = "Super High Pressure" 950-1150PSI, Some people are starting to call 1200+ PSI regulators "Ultra High Pressure" UHP = 1200PSI-2000PSI, nodding to the tanks used for PCP filling and PCP power.
The "Simple Simon" evolved into the MAC-1 USFT built by Tim McMurray. Gen1 guns were unregulated and used a large 1400PSI Aluminum Reservoir (400CC), Gen2 guns used a UHP Regulator 1400-1600PSI with a 13 or 22 CI 3000PSI Tank.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Short question topic

Unread postAuthor: farcticox1 » Sun Jun 17, 2018 7:31 am

Hmmm, so when I use 160psi it's actually considered ULP, Ultra Low Pressure. :o

We need a terminology table.
LPR 100-150 psi
ULP 100-250 psi
SLP 250-350 psi
SP 750-950 psi
SHP 950-1150 psi
UHP 1200-2000 psi
:?
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