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Member Since 27 Nov 2008
Offline Last Active Apr 22 2016 05:16 PM

Posts I've Made

In Topic: auto cocker show of death

26 February 2009 - 03:36 PM

Wow, I completely passed over the consistency aspect of sweet spotting. So wouldn't the most efficient point also be the least consistent?

In Topic: Paintball ASTM?

26 February 2009 - 03:33 PM

I just stumbled on this thread and I have some comments on the efficiency test; sorry for going back to an old topic.

When shooting a constant 280 fps, paintballs with different weights will require more/less energy than others to reach that velocity. The difference in air usage may add up over time. Perhaps use [#paintballs/1000 psi/tank volume/(weight per paintball)]

Potentially a buzz kill - how accurate are tank pressure gauges?

Also, I don't think that tank size will matter too much regarding efficiency so long as the test goes from one specified psi to another. Even though a 45/4500 tank will get less shots going from 2000-1000psi, it should have the same volume-averaged number of shots at each (decreasing) operating pressure as a 68/4500.

One more thing. Why not combine the pure efficiency and shots per tank tests? Run one from 2000-1000psi, then run the other right after it starting from 1000psi until the velocity increases. Saves paint and time.

In Topic: auto cocker show of death

26 February 2009 - 02:38 PM

I've got a question about the sweet spotting method in general; using the pressure which gives you the highest velocity doesn't seem like it would necessarily result in the highest efficiency. If you increase the pressure, you'd expect the velocity to increase (at least up until the pressure gets too high and the velocity is adversly affected). If you plotted velocity vs pressure, wouldn't the pressure of greatest efficiency occur where the slope of curve has a maxima? Physically, this would be the point where a given incremental increase in pressure results in the greatest increase in velocity.

In Topic: Comprehensive Tippmann Front Bolt and Powertube Test

14 January 2009 - 12:33 AM

Very thorough test. Thank you!

In Topic: porting?

26 December 2008 - 01:40 PM

By the way, I have a ported, stock 11" trracer barrel