Refer to figure.
The "Never-exceed speed", denoted as VNE, may not be exceeded under any circumstances, even in a dive.
This speed is almost always designated by a heavy red line on the aircraft’s speed indicator and if exceeded could result in poor handling qualities and even damage the helicopter.
VNE decreases with altitude for two reasons:
- The thinner air means that the rotor blades need a higher angle of attack to get the same lift
- The ASI reads incorrectly.
Things that impose a VNE in helicopters include:
- Retreating Blade Stall
- Airflow Reversal over the root of the retreating blade
- Cyclic Range
- Compressibility effect
At a lower speed, in level flight, a helicopter may reach its maximum continuous power MCP—the maximum amount of power the helicopter can fly at for more than a few minutes. This speed is denoted as "VH" and is the velocity of Max Continuous Power (MCP), at which the helicopter will consume the maximum power it can sustain level flight.
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