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Short question topic

A place to ask general spud cannon related questions.
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Unread postAuthor: jrrdw » Sun Jan 16, 2011 10:58 am

Labtecpower wrote:Well, that was the whole confusion I was talking about :wink:

Okay; valve seat: 8 mm. piston :10 mm.


If it is configured in the tee properly, it should work fine.
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 16, 2011 11:39 am

jrrdw wrote:If it is configured in the tee properly, it should work fine.


agreed.
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Unread postAuthor: FighterAce » Thu Jan 20, 2011 3:53 pm

Second quickie question I guess... Regarding writing dimensions

There are 2 dimensions for O rings... inner diameter and the diameter of the cross section. Example: 2x2mm --> ID=2mm OD=6mm.

Is this the same for pipe dimensions? I'm uncertain about the dimension 25x2.5.
Does it mean ID is 25mm and the walls are 2.5mm witch means OD is 30mm?
Or is 25mm the OD, the walls 2.5mm witch would make the ID 20mm? I think the ID is 20mm but I'm not so sure anymore because of the way O ring dimensions are written.
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Unread postAuthor: velocity3x » Thu Jan 20, 2011 7:13 pm

Maybe this will help:

Standard O-ring chart

http://www.marcorubber.com/sizingchart.htm
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Unread postAuthor: Lockednloaded » Thu Jan 20, 2011 8:23 pm

would a magazine that feeds at a 45 degree angle with gravity pushing the balls towards the valve, but with a stop, feed effectively?

Something like this (hope this works)
.\o\
..\o\
...\o\
....\o\
___\o\____
____o|____<- air flow

EDIT: this would be used semi automatically
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Last edited by Lockednloaded on Thu Jan 20, 2011 9:08 pm, edited 1 time in total.
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Unread postAuthor: saefroch » Thu Jan 20, 2011 9:07 pm

Probably would have big issues with multiple feeds, unless you're running exclusively fully auto with a very short cycle time. I don't think we can say for certain if it will or won't work.
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 21, 2011 12:59 am

saefroch wrote:Probably would have big issues with multiple feeds


Actually for semi-auto or low rate of fire it would be perfect, it's when fast cycling rates are involved that "tee" type magazines without blocking bolts tend to misfeed or doublefeed.

I used such a magazine in my marble autocannon, at low ROF worked a treat:

[youtube]http://youtube.com/watch?v=EYfNtMtwo0Y[/youtube]
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Unread postAuthor: FighterAce » Fri Jan 21, 2011 8:14 am

velocity3x wrote:Maybe this will help:

Standard O-ring chart

http://www.marcorubber.com/sizingchart.htm


I didn't ask for O ring dimensions nor do I even need O ring dimension chart

But I found my answer by calculating the estimated weight of the pipe and comparing it to the advertised weight per meter... Pipe dimensions are Outer Diameter x Wall Thickness - which makes the ID 20mm in my example.
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Unread postAuthor: velocity3x » Fri Jan 21, 2011 9:16 am

FighterAce wrote:I didn't ask for O ring dimensions nor do I even need O ring dimension chart


My bad.....Based on your statement, I thought you found o-ring dimensions to be confusing.

I think the ID is 20mm but I'm not so sure anymore because of the way O ring dimensions are written.


I suggest you STUFF the link close by for future reference.
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Unread postAuthor: Fnord » Wed Jan 26, 2011 7:17 pm

How much energy is stored in 100cc of air at 10 BAR, and 50 cc of air at 20 bar?

This should be a stupid question, but after trying to cross-reference several sources across the internet, I'm getting conflicting results; sometimes by a factor of ten. There is so much "air-car" spam out there it's nearly impossible to sort through the crap.

The numbers I came up with were 200 and 300 joules, repectively.
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Unread postAuthor: Lockednloaded » Wed Jan 26, 2011 7:57 pm

I was thinking that by angling the mag 45º PBs would be pushed backward towards the valve, but held back by a stop. Do you get it, or am I making some false assumptions?
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Unread postAuthor: saefroch » Wed Jan 26, 2011 8:58 pm

A quick google search. How useful that is, I'm not sure but the equations look very familiar from AP chem.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 27, 2011 2:39 am

Lockednloaded wrote:I was thinking that by angling the mag 45º PBs would be pushed backward towards the valve, but held back by a stop. Do you get it, or am I making some false assumptions?


Angling the magazine won't make it function any differently from the Tee style magazine linked to above.
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Unread postAuthor: Labtecpower » Thu Jan 27, 2011 1:36 pm

OK, another question :wink:

I have a 42 mm ID steel pipe, (welded)
it has a nasty burr on the inside, wich I dont like.
I'm going to make a QDV with it, and the O-rings wont seal on it, and get killed.

What is the fastest and most efficient way to remove it?

I know there is some topic floating around, about techs QDV. he also had a pipe with a burr. I used the search, but I haven't found it.

Hell yeah, 300 bux. SIGNATURE ! :D
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 27, 2011 2:10 pm

Labtecpower wrote:I know there is some topic floating around, about techs QDV. he also had a pipe with a burr. I used the search, but I haven't found it.


Seek and ye shall find :)
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