Maybe one of you may be able to help me with this question:
I was recently out at the observation park one night, sitting in my car on the phone with the windows down. I heard what sounded like a military helicopter (ie the sound of an Apache) taking off and looked out but it was not a helicopter, it was an airplane with a prop on each wing. My initial thought was that it might be one of those Osprey aircraft that the Marine Corps uses, but couldn't understand why one of those would be at RDU. Other than the sound, the only thing I can really use to describe it (since it was night and I couldn't really see it) was that as the blades of plane spun around, they had a green light on the tips of the blades that made a green lit circle as blades rotated. Strange, but it got my curiosity level up.