Paintball

[splattttttt]

Originally Posted by cjottawa

I'm confident there's no leak in my gun. I can leave it gassed up for a week and it's still got a full charge of gas.

The cloud of gas from the barrel is only on the first few shots.

Regarding efficiency and my specific gun, R043:
- red main spring, blue valve (if I change this relationship and go lighter on the main or heavier on the valve, I can't reach 275fps)
- #6 powertube (high flow)

I just don't see how I can get around that combo. Any lower flow or shorter dwell and paint won't reach 275fps.



Unmodified Redux valve (low-ish volume) check.
#6 Powertube, check.
The valve chamber inside the insert has a relatively unobstructed path to the powertube. There's a millimeter or so
The insert redirects the gas from the 12-gram to avoid liquid going direct from 12-gram to powertube ports.

Give me some time to test this...

Right O CJ

[DSA]

CJ your the Ben Franklin of Stock Class I'm sure given enough time you'll figure it all out.

[dundadun]

Originally Posted by DSA

CJ your the Ben Franklin of Stock Class I'm sure given enough time you'll figure it all out.

and then make dummies guide with pictures!

[CJOttawa]

Shot this weekend.

Testing Conditions

• Redux 043
• red (heavy) main spring + blue (medium) valve spring
• 25-gram milled hammer
• MOSA food-grade 12-gram powerlets
• max outside air temperature (OAT) 25°C/77°F
• paint: Marbilizer (very brittle, previously breaking in gun)
• insert: TyMcneer 0.675cal brass Freak

Result

• ~275 fps.
• NO IN GUN BREAKS, even with Marbilizer!
• TPC needed to be turned in somewhat farther to get velocity up; un-changed, it gave about 255fps.
  

Conclusions
The brass valve insert keeps liquid CO2 from traveling directly from the 12-gram to the powertube inlet vents.

The reduction in velocity was likely the result of reduced flow rate around the valve insert.

The solution will be to build another insert with larger channels to allow unchoked gas flow inside the valve.

In the meantime, screwing the TPC in farther raises dwell enough to get velocity up.

DD68 Redux owners should consider this mandatory. With no liquid dump on the first few shots, the risk of shattering paint is reduced and allows the use of brittle, tournament-grade paint like Marblizer, X-Ball Gold or Silver.

[Jackson]

That's great! Any change in efficiency?

[splattttttt]

CJ didn't mention efficiency, which I find strange considering the fact that it must have gotten better as well.
Strange.

[CJOttawa]

Originally Posted by Jackson

That's great! Any change in efficiency?

This weekend, I was primarily focused on making the gun more gentle on brittle paint. Not such a big deal with my M.CB crew but definitely walk-ons "not noticing" when hit or reporting bounces.

Marblizer or X-Ball Gold left a square-foot of fluorescent goo on impact and that's a big plus playing stock class against people shooting full-auto.

Originally Posted by splattttttt

CJ didn't mention efficiency, which I find strange considering the fact that it must have gotten better as well.
Strange.

Mongo reports increased efficiency netting 3-5 extra shots off a 12-gram with a valve insert:

Originally Posted by mOngo

I haven't experienced this... my velocity is at 265-275.. at 300+ I get some breakage. The diffuser is a great idea, and in my exprience, has increased my shot count by 3 to 5 useable shots per 12 gram. Mike C and I have discussed, and both agree that many issues are paint related, and not the marker in and of itself.

Not a big change but the insert will at least keep the first few shots from dumping liquid CO2 directly into the powertube on the first few shots.

I'll get serious about efficiency testing once I have a "version 2.0" insert with larger channels.

[Canuck]

Originally Posted by cjottawa

This weekend...

Marblizer or X-Ball Gold left a square-foot of fluorescent goo on impact...

Yeah, completely covering one whole side of my DuckSlide...

[dundadun]

so it is choking it a tiny bit, but nothing the tpc can't handle, and larger holes will fix that?
are you going to just cut bigger holes or were you going to make a second one that way you can swap between and compare?

so far, pro's are softer on paint and no cloud.
con, need to adjust veloctiy.

did I miss anything?

[russc]

The biggest pro I've found from blocking the path from cartridge to cupseal is that your shot curve flattens out. I'm speaking anecdotally of course, but from my experience you get a lower initial velocity (since there is no liquid being shot out) but it holds that velocity better.