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Forum: CCI 07-28-2014, 09:20 AM
Replies: 16
Views: 1,046
Posted By Lurker27
Shorter than 12"? backs are 9.3" so I think...

Shorter than 12"?

backs are 9.3" so I think they'd clear the pump but I'm not sure about the OD.
Forum: Custom Projects / Custom Questions 06-18-2014, 10:29 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Glad to hear it!

Glad to hear it!
Forum: WTB 06-09-2014, 09:11 AM
Replies: 12
Views: 179
Posted By Lurker27
sig

sig
Forum: Custom Projects / Custom Questions 04-24-2014, 11:30 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Totally agree with this - the interface between...

Totally agree with this - the interface between the bolt tube and power tube seems the most troublesome to me. an o-ringed bolt would help too, but at some point you're giving up pump stroke feel,...
Forum: Dealers Forum 04-23-2014, 08:15 PM
Replies: 172
Views: 11,680
Posted By Lurker27
Curious to get an explanation of the final form.

Curious to get an explanation of the final form.
Forum: Custom Projects / Custom Questions 04-23-2014, 06:00 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Is the sail closer to the valve hole on this one?...

Is the sail closer to the valve hole on this one? That could cut into volume...
Forum: Custom Projects / Custom Questions 04-23-2014, 12:43 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
So, never?

So, never?
Forum: Custom Projects / Custom Questions 04-23-2014, 11:19 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Technically the answer is to make the rate of gas...

Technically the answer is to make the rate of gas expansion slow enough that the thermal transfer can keep it at a constant temperature.

You can either slow the expansion rate of the gas,...
Forum: Custom Projects / Custom Questions 04-22-2014, 04:49 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Excellent thread, Manning - we clearly still have...

Excellent thread, Manning - we clearly still have some work to do here
Forum: Custom Projects / Custom Questions 04-22-2014, 04:46 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
P0E points out quite rightly that calculation...

P0E points out quite rightly that calculation uses an adiabatic assumption, which isn't strictly correct - the more heat transfer into the gun, the higher the efficiency ceiling.
Forum: Custom Projects / Custom Questions 04-22-2014, 03:47 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
I'll probably try to see what I can do on that...

I'll probably try to see what I can do on that front, eventually. Freaks are just SO short
Forum: Custom Projects / Custom Questions 04-22-2014, 12:46 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
in other words, don't hold your breath, note that...

in other words, don't hold your breath, note that in russc's test he specifically says 5-10s between shots...
Forum: Custom Projects / Custom Questions 04-22-2014, 12:45 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
631.8 J? Carbon dioxide 574 kj/kg .012...

631.8 J?

Carbon dioxide 574 kj/kg

.012 kg

is 689J

Some estimates are even lower
Forum: Custom Projects / Custom Questions 04-22-2014, 12:09 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Those numbers might be hard to top. The...

Those numbers might be hard to top.


The reason I'm so concerned with volume is the Phantom is just flat out running out of energy to shoot a ball ~285 in this configuration. Those autocockers...
Forum: Custom Projects / Custom Questions 04-22-2014, 12:06 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
http://www.mcarterbrown.com/forums/pump-markers/70...

http://www.mcarterbrown.com/forums/pump-markers/70535-snipers-12-grams-co2-discussion-2.html

Thread with current record btw
Forum: Custom Projects / Custom Questions 04-22-2014, 11:57 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
We're going to use energy figures, not "shots"...

We're going to use energy figures, not "shots" because science. IMO

http://www.mcarterbrown.com/forums/pump-markers/229833-known-mcb-12g-paintgun-efficiency-records-up-2013-a.html

3g and 285...
Forum: Custom Projects / Custom Questions 04-21-2014, 02:45 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Don't be so sure - a 4-40 hole uses a .089" drill...

Don't be so sure - a 4-40 hole uses a .089" drill

(.089/.050)^2= 3.1684

Meaning 3 holes at .050 is actually less than 1 4-40 hole

This is before wall effect correction too (Hagen-Poiseulle...
Forum: Custom Projects / Custom Questions 04-21-2014, 02:05 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Oh right you can reduce your spring tension and...

Oh right you can reduce your spring tension and test this one at 280ish.

Yea I bet this one does real well
Forum: Custom Projects / Custom Questions 04-21-2014, 02:03 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
This is also great because we have a baseline, 3...

This is also great because we have a baseline, 3 x .050 is just a LITTLE TOO MUCH flow into the valve chamber area.

I actually think exactly what you made but with 3 x .050 drilled like on the...
Forum: Custom Projects / Custom Questions 04-21-2014, 01:56 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Awesome! I bet how you moved the powertube holes...

Awesome! I bet how you moved the powertube holes right up to the valve mouth helps a lot.

Is that brass, too? I bet the extra damping mass of the brass helps as well, because it's still mass that...
Forum: Custom Projects / Custom Questions 04-21-2014, 11:16 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Neither, it's just a 2 stage restriction to...

Neither, it's just a 2 stage restriction to manage the valve closing forces differently...
Forum: Custom Projects / Custom Questions 04-21-2014, 10:22 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
RedneckSniper, Did you use a 70 duro seal? I...

RedneckSniper,

Did you use a 70 duro seal? I could redesign the groove to use either an even smaller and more stretched ring, or even a metric seal. Just more squeeze is probably the easiest way...
Forum: Custom Projects / Custom Questions 04-19-2014, 04:31 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
He could just drill and tap deeper to adjust that...

He could just drill and tap deeper to adjust that right?
Forum: Custom Projects / Custom Questions 04-19-2014, 04:09 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Hey if I could actually build things instead of...

Hey if I could actually build things instead of just thinking about them...I'd be a much better and more productive person, instead of the bitter husk of a man you observe today.
Forum: Custom Projects / Custom Questions 04-19-2014, 03:35 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Thank you so much for delivering this prototype...

Thank you so much for delivering this prototype and results btw
Forum: Custom Projects / Custom Questions 04-19-2014, 03:33 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
The first thing I might suggest if you didn't...

The first thing I might suggest if you didn't have an oring on the big wall is lathe off the valve side of the big wall, to pick up about .060" of length and volume on that side.

It still needs...
Forum: Custom Projects / Custom Questions 04-19-2014, 02:39 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
This is very exciting, looks great! Can't wait to...

This is very exciting, looks great! Can't wait to hear how it does!
Forum: Custom Projects / Custom Questions 04-18-2014, 11:48 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
This is the 2 stage in case anyone was...

This is the 2 stage in case anyone was interested. I hope the 1 stage just works up front though

http://ogrestrength.com/eigen2.png
Forum: Custom Projects / Custom Questions 04-18-2014, 07:30 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
I think ApoC just meant the proximiaty of the...

I think ApoC just meant the proximiaty of the feed to the valve mouth makes certain configurations really hard to avoid the entrainment of liquid through the valve mouth. I don't think he was throwin...
Forum: Custom Projects / Custom Questions 04-18-2014, 03:56 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
I'd say aluminum is the best call

I'd say aluminum is the best call
Forum: Custom Projects / Custom Questions 04-18-2014, 02:23 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
yea, just if my specified hole is too...

yea, just if my specified hole is too restrictive, which I think it might be. I wouldn't bother to tap the hole for the 4-40 screw until we know about velocity.

probably don't need the metric...
Forum: Custom Projects / Custom Questions 04-18-2014, 01:33 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
:D :D :D If your velocity is low, just keep...

:D :D :D

If your velocity is low, just keep drilling the holes. I wouldn't worry about the bumper on the big end at all for this iteration
Forum: Custom Projects / Custom Questions 04-18-2014, 10:20 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Yep, time to test and modify the simple version,...

Yep, time to test and modify the simple version, if there's snow ruining the performance, we'll go to the 2 stage
Forum: Custom Projects / Custom Questions 04-17-2014, 04:58 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Also, I would be happy to produce the first batch...

Also, I would be happy to produce the first batch of ~100 if the prototype results are on point.
Forum: Custom Projects / Custom Questions 04-17-2014, 04:57 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
I thought a bit more about the "too much closing...

I thought a bit more about the "too much closing force" issue.


With the rear bore (drill hole) of the Phantom, we can set up a 2 stage restrictor as well. This would have a large, CO2 limiting...
Forum: Custom Projects / Custom Questions 04-17-2014, 12:32 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
This one should seal at around .275, ~47 .5lbs of...

This one should seal at around .275, ~47 .5lbs of closure force (still a lot)

In comparison, the .312 is ~61.2 lbs, which is a 28.8% difference in force

All things considered , squaring and...
Forum: Custom Projects / Custom Questions 04-17-2014, 12:41 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Back of the envelope & based on yoda's experience...

Back of the envelope & based on yoda's experience I strongly suspect even a 1/16" hole is too restrictive.

That said the design should just need to be dialed in
Forum: Custom Projects / Custom Questions 04-17-2014, 12:32 AM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Well, there are handles: Decrease...

Well, there are handles:

Decrease restriction (adjustable screw, hole size)

Add hammer weight (50% more hammer weight more than doubles the valve dwell by inertial damping)

Those are the big...
Forum: Custom Projects / Custom Questions 04-16-2014, 11:38 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
oh HERE it was ...

oh HERE it was

http://www.mcarterbrown.com/forums/2184210-post1120.html

You were at low pressure, right? I really think that you lose a lose of volume energy in that case.
Forum: Custom Projects / Custom Questions 04-16-2014, 09:55 PM
Replies: 1,858
Views: 106,376
Posted By Lurker27
Josh, thanks! It looks like there's a bit more...

Josh, thanks! It looks like there's a bit more room to edit my drawings and get more valve side volume (extra .03 of length or so).

Not sure if I should, though, it could get dangerous
Showing results 1 to 40 of 236

 
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