What is the best diameter of a spill hole in a parachute?

The optimal diameter of a spill hole in a parachute typically ranges from 3 to 5 inches (7.5 to 12.5 cm), depending on the parachute's size and design. This diameter helps to regulate descent speed and stability by allowing excess air to escape, reducing the risk of oscillations and ensuring a controlled descent. Proper sizing is crucial for balancing descent rate and maneuverability during landing.