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That darn Dr. Ashby

Started by RGK, September 14, 2007, 11:00:00 PM

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maxwell

nice heads like to see how they test out.

Bill

Dr. Ed Ashby

Ron, what Curtis is referring to is skip angle, and it's a factor with both single and double-bevel broadheads. There are a number of broadheads which show a 50% skip rate when the angle of bone impact reaches 30 degrees - far less than a true 'quartering' angle. However, some recent testing suggest that a short-wide (poor mechanical advantage) single-bevel BH shows a higher frequency of bone-skips once the skip angle is reached. There may also be some other factors at play in the outcomes though; and it will take more testing before anything clear-cut is known.

Not to leave a wrong impression, skip angle is PRIMARILY a function of broadhead MA; not the type of edge bevel. However, combining an already poor skip angle with a BH that tends to rotate appears to cause an increase in the frequency of skips (at the BH's skip angle).

With short-wide broadheads there's a bit of a trade off. In frequency of bone-penetration, they benefit the most (percentage wise) from having a single bevel. However, once the skip angle is reached, they show a higher frequency of bone skids than when double-beveled.

The bottom line: Regardless of the broadhead you use, know its skip angle and try to avoid hitting a bone at an angle that's anywhere near the skip-angle!

For what its worth, the best skip angles yet tested were: the the single-beveled Modified Grizzly and double-beveled Howard Hill (tied for second place),' with the ultra-high MA Grizzly Extreme (single beveled) being the best (but also too narrow to be legal in many areas).

Ed

tradtusker

heads look great. best of luck with the season with those i recon they'r gonna work very well.
thanks for sharing your work as well
There is more to the Hunt.. then the Horns

**TGMM Family of the Bow**

Warthog Blades

Andy Ivy


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