Geometry - SilverFlame broadheads
Consistently CONVEX !!!
If one regards the blade shape of today's broadheads axially for impulse direction, especially those broadheads designed to cut-on-contact, then there are three different basic geometries: Convex, concave and V-style.
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Konvex |
V-Form |
Konkav |
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More than 90% of all broadhead blades possess a V-style, thus a straight cut. This is due to economical reasons, since a straight cut can be sharpened most simply and thus most cheaply industrially.
The reason, why the SilverFlame Broadheads come with a convex geometry, is because of the vast superiority of this shape when compared the two previously mentioned, when it comes to penetrating hard material (bone), based on the following reasoning:
As long as the broadhead meets no considerable resistance, geometry does not play a large role. If it applies to press however hard material apart or blow up, the V-shaped and even more the concave blade will show a lack of performance comparing to the convex blade, since first two always have full blade contact with the material, while the convex point already breaks and presses the bones apart at its tangents. Thus only that which was not cut at the tangent, slides over the remaining length of the cutting surface.
There exists certain principles/dynamics which are accepted universally as they apply to the performance of any cutting edge.
For example, imagine, you want to split a wooden stump (log) and have one wedge, each containing the three mentioned geometries for the task at hand. With the concave wedge penetration will be slight as it seizes during the initial forces upon contact.
Furthermore, you will discover the V-shaped wedge clearly outperforms the concave wedge in penetration.
The convex wedge will even prove far superior to both the previously mentioned shapes. This occurs due to the gap created, without regard to the wedge thickness, but will rather clearly continue to open. Inquire with your butcher regarding this principle, ask him which blade geometry creates the optimum bone splitting ability.
The SilverFlame Broadheads incorporate not only a convex blade, but also a convex ferrule tip. The outermost point is far less sensitive with this geometry than with a V-shaped one or a concave blade.
Blade length (Cutting surface)
The decade-old opinion about the penetrative superiority of a long and narrow blade is physically correct but must be related however concerning the structural integrity of a practicable broadhead.
The accepted length width relationship of 3 : 1, which was publicized at that time by people such as Howard Hill, has quite its authorization, as long as one regards only the narrow blade angle.
The large disadvantage of such a long blade is clearly the "elastically deformation" or "Flexing".
So some bowhunters often have been dismayed at the resulting unsatisfactory penetration of their hunting arrows, although this, when late investigation, was perfectly intact including the broadhead?
The reason for the most part high amounts of energy and momentum, which is used by a very long broadhead at hard hits during the flexible deformation. Also the material choice for the blade is important here. Some manufacturers of very long blades use spring steel, which naturally still supports the flexing effect.
Especially on penetrating harder materials (bones) longer blades (broadheads) have to deal with more friction than shorter ones, too.
An efficient blade construction consists of an adequate combination of cutting length and resistance ability against the flexing, thus as a high amount of the arrow's force for the forward movement (impulse direction) through the game's body as possible will remain intact.
We are most confident that with the SilverFlame Broadheads, we have indeed developed an outstanding and effective combination.
