Heliboy- My Helicycle had the least maintenance of all the 4 gyros I had owned. I spent more time maintaining the pre-rotators of each of the 4 gyros than I spent on maintaining all of my Helicycle. That is not an exaggerated statement. I heard several other Helicycle pilots mention about the very minimal maintenance on their ships. Of course, in any group of machines, there will be exceptions.