1. What is Arrow FOC?

FOC (Front of Center) is a measurement used in archery to determine the balance point of an arrow. It represents the percentage of the arrow's total weight that is located in the front half of the arrow.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( A \) — Distance from the throat of the nock to the balance point (in inches)
• \( B \) — Total arrow length (in inches)

Explanation: The formula calculates the percentage of the arrow's weight that is forward of the center, which affects arrow flight and stability.

3. Importance of FOC Calculation

Details: Proper FOC is crucial for optimal arrow flight, accuracy, and penetration. It helps archers tune their arrows for better performance and consistency.

4. Using the Calculator

Tips: Measure A from the throat of the nock to the balance point, and B as the total arrow length. Enter both values in inches for accurate FOC calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal FOC percentage?
A: For most target archery, 10-15% is typical. For hunting, 12-20% is often recommended for better penetration.

Q2: How does FOC affect arrow flight?
A: Higher FOC makes the arrow front-heavy, improving stability and penetration but may reduce speed. Lower FOC increases speed but can reduce stability.

Q3: How do I measure the balance point?
A: Balance the arrow on a narrow edge (like a pencil) and mark where it balances perfectly. Measure from the nock throat to this point.

Q4: Can FOC be too high?
A: Yes, extremely high FOC (over 20%) can make arrows unstable and difficult to tune, potentially reducing accuracy.

Q5: Does arrow material affect FOC?
A: Yes, different materials (carbon, aluminum, etc.) have different weight distributions, which will affect the FOC calculation.