Why is it considered dangerous to exceed Vne?

Exceeding Vne, or the Never Exceed Speed, in a helicopter is particularly dangerous because it can lead to retreating blade stall. At high speeds, the advancing blade is moving faster relative to the air than the retreating blade, which can result in an aerodynamic imbalance. Specifically, the retreating blade may not generate enough lift to maintain its required performance, leading to a stall. This phenomenon can cause significant loss of control, as the aircraft can begin to roll uncontrollably towards the retreating side. Ensuring that the speed remains below Vne is critical for maintaining aerodynamic stability and safe flight operations. Understanding the implications of exceeding this limit is essential for safe piloting in various operating scenarios.