Bowhunter's Formulas

As archers, why do we need to be concerned with such terms as “mechanical advantage”, “momentum”, and “EFOC”?

TuffHead Trophies

The answer is you don’t, that is, unless you intend to hunt with your bow.


If hunters use a bow in their pursuit of game, they owe it to themselves, and the animals that they hunt, to  make every effort to insure good, clean, ethical kills. To accomplish this it is imperative that one has an in-depth knowledge of their equipment, including knowledge of all the external forces that affect the dynamics of their broadhead and arrow on the way to and during the penetration of their target. A lot of archers will go through their whole hunting career not knowing what these terms mean and how these physical forces effect their arrow penetration and flight.

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Congratulations! If you have read this far you are definitely a cut above the norm. The success of a hunt always involves paying attention to detail. We'll assume you have already looked at at least some of the Ashby studies and understand the values he places on these topics. If you have not reviewed Dr. Ashby's studies on these topics, now is a good time. You'll soon see why we got involved in broadhead design and created the TuffHead™.

Our interests here deals with

        Weight Forward of Center or FOC

        Mechanical Advantage

        Kinetic Energy vs. Momentum

        the Angle of Attack of Broadheads

n these pages listed above, or using the links to the left, we will explain each in greater detail, how to calculate them, and their relevance to your hunting success and our TuffHead design.

   Made in the USA