1. What is Arrow FOC?

Front of Center (FOC) is a measurement that describes the percentage of an arrow's total weight that is located in the front half of the arrow. It's a critical factor in arrow flight and accuracy for archers.

2. How Does the Calculator Work?

The calculator uses the standard FOC formula:

Where:

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

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

3. Importance of FOC Calculation

Details: Proper FOC affects arrow stability, accuracy, and penetration. Most target arrows have FOC between 10-15%, while hunting arrows typically have 12-20% FOC for better penetration.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the ideal FOC for target archery?
A: Most target archers prefer 10-15% FOC, but this can vary based on arrow spine, bow setup, and personal preference.

Q2: Does higher FOC always mean better performance?
A: Not necessarily. While higher FOC can improve stability, excessive FOC may make arrows too front-heavy and reduce speed.

Q3: How can I adjust my arrow's FOC?
A: FOC can be adjusted by changing point weight, adding weight tubes, using heavier inserts, or adjusting arrow length.

Q4: Should FOC be different for indoor and outdoor shooting?
A: Some archers prefer slightly higher FOC for outdoor shooting where wind resistance is a factor.

Q5: Does FOC affect arrow spine requirements?
A: Yes, changing FOC by adding point weight affects dynamic spine, which may require spine adjustment.