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Mega-Pistonr Review Part I: The Polycarbonates |
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Written by Jay
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Tuesday, 09 November 2004 |
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Page 10 of 17 Muzzle Velocity and Rate of Fire Results | Piston | Weight (oz) | Average Muzzle Velocity (fps) | Average Rate of Fire (rpm) | | Classic Army Reinforced | 0.4 | 490.88 | 649.82 | | Systema Polycarbonate | 0.4 | 489.73 | 655.35 | | Deepfire Titanium (single tooth) | 0.5 | 492.66 | 640.57 | | Guarder Polycarbonate | 0.5 | 488.62 | 636.04 | | G&P Polyacetal High Pressure | 0.5 | 487.62 | 633.80 | | Prometheus Hard | 0.6 | 478.74* | 627.18* | *Note: the Prometheus Hard Piston and 7mm bearings failed during the piston stress tests immediately following the rate of fire and muzzle velocity measurements. This may have adversely affected these results. Analysis It is clear from the results above that piston weight is strongly correlated with rate of fire, and this is to be expected. Increased weight equals increased inertia, and in a cyclic system such as the AEG mechbox, additional reciprocal moving mass will place addtional strain on the motor, thereby reducing the rate of fire. What is suprising however is the relative narrow distribution of muzzle velocity measurements among the different piston weights. If the results from the Prometheus Hard Piston is ignored, the difference between the highest and lowest muzzle velocities is a scant 4.04fps, well within the average standard deviation of +/- 2.62 for all the samples.
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