Main Discussion Area > Arrows
Why sharp matters
Mesophilic:
Still looking to see if I can find actual penetration depth measurements based on broadhead width. But did find a couple of blade profile quotes.
--- Quote ---In this initial testing, the 1" wide, modified Grizzly, gave 26% MORE penetration than EITHER the wider Grizzly OR the narrow Grizzly Extreme. For buffalo, there definitely appears to be a 'too narrow' cut width to reduce skin drag on the shaft.
--- End quote ---
--- Quote ---Blade profile: A broadhead having a long and narrow profile will have a higher mechanical advantage than a similar one; either shorter in length or wider in cut. The mechanical advantage of one’s broadhead is one of the major factors influencing penetration; especially in heavy bone. arrows carry a very low amount of force, relative to the task we ask it to perform; or task it might be asked to perform should the hit be less than perfect. At every stage of
developing the hunting arrow one should chose components
maximizing the arrow’s ability to perform as much ‘work’ as
possible with whatever force it has available to it.
Mechanical advantage is the improvement gained by use of a mechanism (machine) in transmitting force. It is the ratio of the “applied force” required to perform a given amount of
“useful work”. In other words, broadhead design can multiply
the force of the arrow, increasing the amount of work it can
achieve with whatever force the arrow carries at the instant
of impact. Not all broadheads offer an equal mechanical advantage. As with any inclined plane, the longer the slope of the plane in relation to the rise of the plane, the higher will be the mechanical advantage. A long and narrow single-blade (2 cutting edges) broadhead will have a higher mechanical advantage than one of equal length and width, but having more blades. Also, as the profile of a broadhead’s blade(s) becomes shorter and/or wider the mechanical advantage becomes less.
--- End quote ---
Mesophilic:
--- Quote from: DC on June 16, 2018, 11:04:20 am ---Is there a width of arrowhead that is optimal? There's going to be a point where penetration suffers if it's too wide. Is it the spacing between ribs that determines that? Obviously if you could get a 3" wide point into the animal it would bleed a lot.
--- End quote ---
After rereading several papers I think optimum broadhead width for penetration has to be considered along with shaft width, arrow weight, and momentum. Seems to be too many factors to make any kind of a blanket statement that specific dimensions will give max penetration across multiple platforms.
Comalforge:
I don't know if they did any research to arrive at this figure, but Texas Parks and Wildlife regulations state a broadhead must have two edges and be a minimum of 7/8" in width. Any point that opens on impact must also meet this minimum width when fully expanded.
Another thing to consider is whether the point goes thru the animal on initial impact or slashes around inside when the game goes off running through the brush with the arrow swinging to and fro. Lots of variables take place in the field.
Hawkdancer:
Not sure if there was any research on the minimum width, but the 7/8" seems to be pretty much standard. Could be input from the manufacturers, also pushing to sell steel points! Colorado also sets the mini at 7/8" and requires steel.. Btw, what is the best way to get that razor edge on a broad head?
Hawkdancer
archeryrob:
Width can definitely be a problem. I shot a buck before and the arrow deflected 15° after hitting the first rib. Went in maybe on the 6th - 7th rib and exited on last rib almost hitting the liver. It was direct broad side and the arrow turned after hitting the rib.
Maryland is Min. 7/8" and steel also
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