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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Calculating BC with LabRadar. It works!
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<blockquote data-quote="entoptics" data-source="post: 1439184" data-attributes="member: 104268"><p></p><p>I too have heard that they are very close to other quality chrony data. They claim ± 0.1% accuracy, and the variance I am seeing between a linear fit and their calculated numbers is no more than 0.5%, which is probably as accurate as any 35P or Magnetospeed.</p><p></p><p>If you look at the graphs I posted though, it's quite clear what's influencing the variation from the linear regression. Their algorithm must be weighted towards readings near the set distances. Perhaps some sort of rolling regression of the points within a few milliseconds of the programed distance.</p><p></p><p>Note V5 on graph 1 is below the line due to the cluster of spurious readings at the end of the flight tracking.</p><p></p><p>Note V5 on graph 2 is below the line due to the spurious reading returned at ~75 yds.</p><p></p><p>Note V1 on graph 3 is way off the line due to the spurious reading returned at ~10 yds.</p><p></p><p>Note V1 on graph 3 is off the line high due to the spurious reading at ~18 yds.</p><p></p><p>Note that when the tracking is good (generally between ~30 yds and ~60 yds) The V3/V4 values lie right on the regression.</p><p></p><p>I understand that external ballistics is quite complicated, but based on my results (a small sample to be sure), I think the internal calculations may be subject to more influence from instrumentation "noise" than they should be.</p><p></p><p>They had to pick an algorithm that would be good for all types of speeds and bullets, and perhaps it's a worthwhile compromise, but might result in some small error in specific conditions.</p><p></p><p>I'll run some more data through and see if obvious patterns emerge. Regardless, the unit is still the best chrony available for the enthusiast in my opinion.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1439184, member: 104268"] [SIZE=14px][/SIZE] I too have heard that they are very close to other quality chrony data. They claim ± 0.1% accuracy, and the variance I am seeing between a linear fit and their calculated numbers is no more than 0.5%, which is probably as accurate as any 35P or Magnetospeed. If you look at the graphs I posted though, it's quite clear what's influencing the variation from the linear regression. Their algorithm must be weighted towards readings near the set distances. Perhaps some sort of rolling regression of the points within a few milliseconds of the programed distance. Note V5 on graph 1 is below the line due to the cluster of spurious readings at the end of the flight tracking. Note V5 on graph 2 is below the line due to the spurious reading returned at ~75 yds. Note V1 on graph 3 is way off the line due to the spurious reading returned at ~10 yds. Note V1 on graph 3 is off the line high due to the spurious reading at ~18 yds. Note that when the tracking is good (generally between ~30 yds and ~60 yds) The V3/V4 values lie right on the regression. I understand that external ballistics is quite complicated, but based on my results (a small sample to be sure), I think the internal calculations may be subject to more influence from instrumentation "noise" than they should be. They had to pick an algorithm that would be good for all types of speeds and bullets, and perhaps it's a worthwhile compromise, but might result in some small error in specific conditions. I'll run some more data through and see if obvious patterns emerge. Regardless, the unit is still the best chrony available for the enthusiast in my opinion. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Calculating BC with LabRadar. It works!
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