1. What is FOC in Bow Hunting?

FOC (Front of Center) is a measurement that indicates how much of an arrow's total weight is located in the front half of the arrow. It's expressed as a percentage and affects arrow flight and penetration.

2. How Does the Calculator Work?

The calculator uses the FOC equation:

Where:

• \( L \) — Arrow length (inches)
• \( AMO \) — Balance point from nock end (inches)

Explanation: The equation calculates what percentage of the arrow's weight is in the front half of the arrow.

3. Importance of FOC Calculation

Details: Proper FOC is crucial for optimal arrow flight, accuracy, and penetration. Most bowhunters aim for 10-15% FOC for balanced performance.

4. Using the Calculator

Tips: Measure arrow length from bottom of nock groove to end of shaft (not including point). Measure balance point from nock end to where arrow balances perfectly. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the ideal FOC for hunting arrows?
A: Typically 10-15% for most setups, though some prefer higher FOC (up to 20%) for better penetration on large game.

Q2: How does FOC affect arrow flight?
A: Higher FOC arrows tend to fly more stable but may drop faster. Lower FOC arrows may be faster but less stable.

Q3: How do I adjust my FOC?
A: Add weight to front (heavier points, inserts) to increase FOC, or reduce front weight to decrease FOC.

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

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