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 characteristics and stability.

2. How Does the Calculator Work?

The calculator uses the FOC formula:

Where:

• \( L \) — Total arrow length (inches)
• \( AMO \) — Distance from nock groove to balance point (inches)

Explanation: The equation calculates what percentage of the arrow's weight is forward 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. Most target arrows have 10-15% FOC, while hunting arrows typically have 12-18%.

4. Using the Calculator

Tips: Measure arrow length from nock groove to end of shaft (not including point). Find balance point by balancing arrow on a narrow edge. Enter weight in grains (1 grain = 0.0648 grams).

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal FOC percentage?
A: It depends on arrow use. Target arrows typically 10-15%, hunting arrows 12-18%, and traditional archery often 15-20%.

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

Q3: How can I adjust my arrow's FOC?
A: Add weight to front (heavier points, insert weights) to increase FOC, or add weight to rear (heavier nocks, wraps) to decrease FOC.

Q4: Does arrow weight affect FOC?
A: The weight itself doesn't affect FOC percentage, but heavier arrows often have higher FOC to maintain stability.

Q5: Should I consider FOC for all arrow types?
A: Yes, though the optimal range varies between target, hunting, and traditional arrows.