This site caught my interest a few weeks ago. Great information. I have wanted to use the saito gas engines for over two years now and finally we have been able to quantify that electric power is not going to give us the desired range, unless magically batteries become more efficient today, not "a few years down the road". The people I work with do not like the idea of gas engines because of their inherent complexity, vibration, oil, but I have been tinkering with gas engines for years and find them to be quite reliable if properly maintained and used properly. There are also ways around the interference problems with the ignition system and ways to reduce vibration... really gooey motor mounts. Watch the video of the engine start up on this scan-eagle. The motor is free to wiggle quite a bit. http://www.youtube.com/watch?v=MphgxWidUjo