P3D – McCoy Helicopter Rotor Effect v3.1, this package replaces two effects and adds a subtle helicopter wake. The two effects are rotor wash for dirt and water. The water effect now adheres to waves of any height and the dirt effect will now adhere to the sides of small hills with gentle slopes. Helicopters can now be individually assigned a specific effect, five sets of various sizes are included and can be used in any combination. All emitters have had their scale, velocity, density, offsets and color adjusted for a more natural and softer appearance compared to v2.5.