After hearing that cold weather may cause errors with my prochrono, I purchased a light kit. I've been playing around with it.
I thought some might be interested in what I found with the new Graying Green Super K from Bear.
The arrows were Beman MFX 600 and 500 spine with 3, 4" feathers.
60" Super K -- 44#@26 (50#@28")
414 Grain Arrow Speed 165 -- GPP 9.41
505 Grain Arrow Speed 154 -- GPP 11.48
I've checked several of my bows. To give me a way to "rate" them in terms of ft/sec/pound of draw weight, I divided the chrony speed by the draw weight. For this Super K I get 3.75 ft/sec/pound of draw weight. This Super K is 2nd only to my Schafer which is 3.83. The Schafer has a 2# higher draw weight.
I have to say I was pleasantly surprised about this Super K! I'm also surprised about the excellent performance of a 56" Cascade I just traded for! That bow is only 44# at my draw length and is 3rd in my 15-bow (all recurves) ranking @ 3.73.
The difference in ft/sec. in the two arrows among the bows ranged from only 8 ft/sec to 16 ft./sec. Most were 9-10 ft/sec difference when adding nearly 100 grains to the arrow. You can see the Super K had a difference of 11 ft/sec.
As others have said about chronographing bows:
1. The first shot from a rested bow is always higher than the subsequent shots. I don't count the first shot (2-3 ft/sec faster). Then I average shots 2-4. Usually there is no difference or only 1 ft/sec between shots 2, 3 and 4.
2. If I don't feel my back muscles at full-draw I will be 1/4-1/2" underdrawn and chrono reading will reflect this with a slower speed.
I'm doing this for fun and to check a few things such as silencer impacts, glove vs. tab, the importance a solid anchor, etc. I have no intention of "judging" a bow brand by what I'm finding.
I'm going to do some momentum calculations (not KE) to help me lock in to the 600 or 500 MFX.
Topic: Light Kit on Chrono -- 2012 Green Super K (Read 504 times)
