1. What is Arrow FOC?

Front of Center (FOC) 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 stability.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( AMO \) — Arrow length in inches (measured AMO standard)
• \( center \) — Balance point in inches from nock end

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

3. Importance of FOC Calculation

Details: Proper FOC is crucial for optimal arrow flight. Higher FOC increases stability but reduces speed, while lower FOC increases speed but may reduce accuracy.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal FOC percentage?
A: Typically 7-15% for target archery, 10-20% for hunting. Optimal FOC depends on arrow setup and shooting style.

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

Q3: How do I adjust FOC?
A: Add weight to point (increases FOC) or use heavier nocks/vanes (decreases FOC). Changing arrow length also affects FOC.

Q4: Does FOC matter for compound bows?
A: Yes, FOC affects arrow flight for all bow types, though the ideal range may vary between compound and traditional archery.

Q5: Should FOC be measured with or without fletching?
A: Typically measured with fletching installed, as this represents the actual flying configuration.