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
Topic: That darn Dr. Ashby (Read 693 times)
