1. What is FOC in Archery?

Front of Center (FOC) is a measurement that describes 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 stability.

2. How Does the Calculator Work?

The calculator uses the FOC equation:

Where:

• \( FOC \) — Front of Center percentage
• \( L \) — Total arrow length in inches
• \( AMO \) — Balance point measurement in inches from nock end

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

3. Importance of FOC Calculation

Details: Proper FOC is crucial for optimal arrow flight. Higher FOC (10-15%) increases stability for long-distance shooting, while lower FOC (7-10%) may be better for short-range hunting.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is a good FOC percentage?
A: Most target arrows perform well with 10-15% FOC. Hunting arrows often use 12-15% for better penetration.

Q2: How does FOC affect arrow flight?
A: Higher FOC makes arrows more stable in flight but can reduce speed. Lower FOC increases speed but may reduce stability.

Q3: Should I include point weight when measuring?
A: Yes, the point weight affects the balance point (AMO) which is part of the calculation.

Q4: Does arrow material affect FOC?
A: The material affects weight distribution, but FOC calculation works the same regardless of material.

Q5: Can FOC be too high?
A: Yes, extremely high FOC (>20%) can make arrows unstable and reduce accuracy.