1. What is Arrow FOC?

Front of Center (FOC) is a measurement that indicates how much weight is distributed toward the front of an arrow. It's expressed as a percentage of the total arrow length and affects arrow flight and stability.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

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

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

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 is a good FOC percentage?
A: Typically 7-15% for target shooting, 10-20% for hunting. Optimal FOC depends on arrow type and bow setup.

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

Q3: Should I include the point when measuring length?
A: Yes, measure total arrow length including point but excluding nock.

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

Q5: Does FOC matter for crossbow bolts?
A: Yes, FOC is important for all projectiles, though optimal percentages may differ from vertical bows.