For 2010 Carbon Express has introduced three new hunting shafts: the Mutiny, PileDriver and Mayhem. This review will take a look at the PileDriver and shortly another will cover the Mayhem.
Carbon Express sent a dozen of the standard PileDriver shafts for analysis and testing. The first thing that struck me about the shafts is the immaculate finish. According to the Carbon Express website the PileDrivers are finished with a special clear coat that adds durability. Whatever the case, the arrows look extremely nice with the clear coat and green graphics. The PileDrivers also come standard with Bulldog Nock Collars and matching nocks.
The hunter version of the PileDrivers has an added camouflage layer to the front half of the arrow to add a little weight and beef up the FOC. PileDriver Hunter 450s are the heaviest of Carbon Express arrows and come in at a hefty 13.6 grains per inch for those people that want that extra “unf” on big game.
For an explanation of how all measurements for this review are made, see the following articles:
How to Measure Arrow Shaft Specifications
How to Destroy and Arrow (in the name of science!)
Carbon Express PileDriver Models, Price and Availability
The PileDriver comes in two main models, the standard and the hunter. The basic differences is a camouflage paint job on the hunter version that adds a bit of weight.
| PileDriver | gpi | Spine | Diameter |
| 250 | 9.7 | 0.412” | 0.298” |
| 350 | 10.4 | 0.345” | 0.301” |
| 250 Hunter | 10.4 | 0.402” | 0.304” |
| 350 Hunter | 11.3 | 0.345” | 0.308” |
| 450 Hunter | 13.6 | 0.300” | 0.318” |
All PileDrivers carry the same tolerance specifications regardless of model:
| Straightness | Weight tolerance | Spine tolerance |
| +/-.005” | +/- 1 grain | na |
The PileDrivers are a relatively new arrow to the market and haven’t quite made it to all archery shops yet, but I was able to find them at the majority of online shops. There was a pretty big variance in costs per dozen:
| Shaft | Arrow | |
| Standard | $80-$96 | $90-$106 |
| Hunter | $90-106 | $100-$116 |
Carbon Express PileDriver Shafts: Weight
| Grains | Variance | |
| 1 | 329.573 | -0.872 |
| 2 | 329.697 | -0.748 |
| 3 | 330.067 | -0.378 |
| 4 | 330.175 | -0.270 |
| 5 | 330.283 | -0.162 |
| 6 | 330.391 | -0.054 |
| 7 | 330.515 | 0.070 |
| 8 | 330.546 | 0.101 |
| 9 | 330.793 | 0.348 |
| 10 | 330.839 | 0.394 |
| 11 | 331.317 | 0.872 |
| 12 | 331.317 | 0.872 |
| Average | 330.460 | |
| Median | 330.445 |
As a mid-range shaft, the PileDriver holds excellent weight tolerances. With +/- 0.872 grains measured on the dozen I tested; they are easily under the +/- 1 grain spec. There were no major outlaying shafts; they were all quite evenly spread throughout the range. The measured dozen had a grains per inch of 10.725 which is slightly higher than the 10.4 stated on the website. As long as this number is consistent across all different dozens, it’s not an issue. In fact, it would be welcome by many hunters that are looking for a heavier arrow.
Carbon Express PileDriver Shafts: Inside and Outside Diameters
All of the PileDriver shafts tested had an exact inside diameter of 0.243″. The outside diameter measured 0.301″ for nine of the shafts and 0.3015″ for three shafts. Half a thousandth difference across all the shafts is excellent and nothing to “split hairs” over.
Carbon Express PileDriver Shafts: Spine Consistency
| Label | Side 1 | Opp. Label | Side 2 | |
| 1 | 311 | 312 | 311 | 311 |
| 2 | 312 | 310 | 312 | 310 |
| 3 | 312 | 312 | 313 | 314 |
| 4 | 312 | 311 | 311 | 313 |
| 5 | 312 | 311 | 313 | 314 |
| 6 | 313 | 312 | 313 | 311 |
| 7 | 313 | 312 | 312 | 311 |
| 8 | 314 | 313 | 312 | 314 |
| 9 | 315 | 312 | 313 | 314 |
| 10 | 316 | 317 | 318 | 317 |
| 11 | 318 | 317 | 318 | 317 |
| 12 | 318 | 317 | 318 | 317 |
While the PileDriver shafts do not have a spine consistency tolerance, which may lead you to believe they wouldn’t be very good, they had a maximum difference of 0.007″. Once again, for a mid-range shaft, these are excellent numbers.
Carbon Express PileDriver Shafts: Straightness
| Straightness | |
| 1 | 0.0020 |
| 2 | 0.0025 |
| 3 | 0.0030 |
| 4 | 0.0035 |
| 5 | 0.0040 |
| 6 | 0.0045 |
| 7 | 0.0050 |
| 8 | 0.0055 |
| 9 | 0.0055 |
| 10 | 0.0075 |
| 11 | 0.0075 |
| 12 | 0.0075 |
Carbon Express’s straightness specification calls for +/- 0.005″ for a total span of 0.010″. The measured values were all well within this range and the worst shafts bested the spec by 25%.
| Straightness | |
| 1 | 0.0020 |
| 2 | 0.0025 |
| 3 | 0.0030 |
| 4 | 0.0035 |
| 5 | 0.0040 |
| 6 | 0.0045 |
| 7 | 0.0050 |
| 8 | 0.0055 |
| 9 | 0.0055 |
| 10 | 0.0075 |
| 11 | 0.0075 |
| 12 | 0.0075 |
Loading ...
{ 2 trackbacks }