1. What is Arrow FOC?

FOC (Front of Center) is a measurement that describes the balance point of an arrow in relation to its total length. It's expressed as a percentage and affects arrow flight and penetration.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( front\_center \) — Distance from the throat of the nock to the balance point of the arrow (inches)
• \( total\_length \) — Total length of the arrow (inches)

Explanation: The formula calculates how much of the arrow's weight is distributed in the front half of the arrow compared to its total length.

3. Importance of FOC Calculation

Details: Proper FOC is crucial for optimal arrow flight and penetration. Higher FOC arrows typically have better penetration but may sacrifice some speed.

4. Using the Calculator

Tips: Measure carefully from the throat of the nock to the balance point for front_center. Measure total arrow length from nock groove to end of shaft (not including point).

5. Frequently Asked Questions (FAQ)

Q1: What is a good FOC percentage for hunting?
A: Most hunters prefer 10-15% FOC for a balance of speed and penetration, but some prefer higher FOC (15-20%) for maximum penetration.

Q2: How does FOC affect arrow flight?
A: Higher FOC arrows tend to be more stable in flight and penetrate better, but may drop faster at longer distances.

Q3: How do I adjust FOC?
A: Add weight to the front (heavier points, inserts) or reduce weight at the rear (lighter vanes, nocks) to increase FOC.

Q4: Does FOC affect broadhead flight?
A: Yes, proper FOC is especially important for fixed-blade broadhead stability in flight.

Q5: Should FOC be different for target shooting vs hunting?
A: Yes, target arrows often have lower FOC (7-10%) for flatter trajectory, while hunting arrows benefit from higher FOC for penetration.