another advantage with the RCM mount like i mentioned before is the fact that you can run huge pinions and 6S packs. here's a video i took today of a couple of speed runs.
I need a longer road because i was having to hit the brakes as it was coming towards passing the camera just as i was getting to full speed. About 50 feet behind me was the end of the road which is about how far it takes to stop going as fast as i was.
http://s247.photobucket.com/albums/g...t=HPIM6235.flv
that's geared 45/24 i believe.
going away from the camera is 1/2 throttle, coming towards the camera is just about full throttle.