I plan to try it this weekend and see how it does. Just was wondering. The 3S setup works flawless and have made 20 min main with plenty still left in the batt's (10.9v left in each). Which means that is probably a solid 30 min setup. Now I was thinking the 6S would be lighter and keeping the same rpms would keep amp draw lower with the higher V available. 4S I tried already runtimes were less only 15-17mins max and twin 4's is heavy.
Our track is pretty large so you have to have lots of MAH to make the big mains.
http://www.youtube.com/watch?v=C5xT8jB8v1o