1. What is FOC?

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

2. How Does the Calculator Work?

The calculator uses the Gold Tip FOC formula:

Where:

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

Explanation: The formula calculates what percentage of the arrow's length is in front of the center point.

3. Importance of FOC Calculation

Details: Proper FOC affects arrow stability, accuracy, and penetration. Most target arrows have 7-15% FOC, while hunting arrows typically have 10-20%.

4. Using the Calculator

Tips: Measure arrow length from nock groove to end of shaft (not including point). Measure balance point by finding where the arrow balances on a narrow edge.

5. Frequently Asked Questions (FAQ)

Q1: What's the ideal FOC percentage?
A: It depends on arrow use. Target archers typically prefer 7-15%, while hunters may want 10-20% for better penetration.

Q2: How does FOC affect arrow flight?
A: Higher FOC makes arrows more stable but slower. Lower FOC makes arrows faster but less stable.

Q3: Can FOC be too high?
A: Yes, excessive FOC can make arrows unstable and reduce speed. Most setups work best between 7-20%.

Q4: How do I adjust FOC?
A: Add weight to front (heavier points, inserts) to increase FOC, or add weight to rear (heavier nocks) to decrease FOC.

Q5: Does arrow material affect FOC?
A: Material affects weight distribution but not FOC calculation. FOC is purely a measurement of balance point relative to length.