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Short question topic

A place to ask general spud cannon related questions.
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 1:59 pm

It was my thread that Gun Freak posted on. I just grabbed the spring with needle nose pliers and then used a screw driver and a hammer to knock the little thing out. Mine didn't unscrew either. hope this helps :)
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 2:35 pm

Hmmm... my cheapo chinese QC comes apart quite nicely.
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 2:41 pm

That little check valve thing is very big on yours JSR. Mine was a tiny little cup sort of thing :?
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 2:52 pm

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Unread postAuthor: wyz2285 » Mon Nov 28, 2011 3:40 pm

I'm planing on buying this 3-way, but I cant find one 1/4 only 1/8 ...
I need one 1/4
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 4:17 pm

best i can find is this 5 way
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 4:30 pm

I don't know if this counts as a double post but...
I'm looking for a pilot valve for a co-axial rocket launcher and was wondering if this one would pilot a 45g piston?
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Unread postAuthor: MrCrowley » Mon Nov 28, 2011 4:31 pm

Yup, that's a double post. Next time just edit your previous post :wink:
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 4:34 pm

Oops, sorry will do next time :)
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 4:54 pm

sharpshooter11000 wrote:a 45g piston?


Wrong parameter ;)

How big is the pilot volume, what diameter is the piston and more importantly, how good is the fit of the piston in the tube its travelling in?
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 5:12 pm

Diameter- 52mm
Pilot volume- I don't know, it's 70x53 cylinder and on a calculator it came up 148660??? :?
Which leaves a gap of 0.5mm around the piston
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 5:24 pm

sharpshooter11000 wrote:Which leaves a gap of 0.5mm around the piston


More precisely, 0.825cm<sup>2</sup> of area for air to flow from the main chamber to the pilot.

That's more than can flow through a 1cm diameter tube.

Short answer - no.
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 5:26 pm

If I reduce the pilot volume it should work, right?
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 28, 2011 5:34 pm

Image

Need a tighter piston.
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Unread postAuthor: sharpshooter11000 » Mon Nov 28, 2011 5:40 pm

Can be solved with an o-ring or insulating tape :wink: so the pilot volume's ok?
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