There's a glitch with the rotor blades of the V-44. On the Horizon, they disappear. Below the horizon and in front of water, they look like they're underwater/have a water type effect. When they are above the horizon, they look like they should, which is how they appear when you're looking at them from above towards the ground. When you're inside the cockpit view and you look towards the nacelles, you can't see them when the engines are on. When you shut the engines off and the engine speed gets low enough, the rotor blades reappear.