1. What is FOC (Front of Center)?

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

2. How Does the Calculator Work?

The calculator uses the FOC equation:

Where:

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

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

3. Importance of FOC Calculation

Details: Proper FOC affects arrow flight, accuracy, and penetration. Higher FOC arrows are more stable but may sacrifice speed, while lower FOC arrows are faster but potentially less stable.

4. Using the Calculator

Tips: Measure total arrow length from nock groove to end of point. Measure balance point from nock end to where arrow balances perfectly. Both measurements should be in inches.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal FOC percentage?
A: Typically 10-15% for target archery, 12-20% for hunting. Depends on arrow type and shooting style.

Q2: How does FOC affect arrow flight?
A: Higher FOC increases stability in flight and improves penetration, but reduces speed. Lower FOC increases speed but may decrease stability.

Q3: How do I adjust FOC?
A: Add weight to front (heavier points, insert weights) to increase FOC. Add weight to rear (heavier nocks, wraps) to decrease FOC.

Q4: Does FOC matter for all arrow types?
A: More critical for traditional and compound bows than crossbows. Carbon arrows are more sensitive to FOC than aluminum.

Q5: Should FOC be the same for all my arrows?
A: Yes, for consistent performance, all arrows in a set should have similar FOC percentages (±1%).