Originally Posted by
EDWARD2003

Sorry, I forgot the important piece of the puzzle, it's 2 cell lipo with 21.5.
Over here in Japan, 21.5 2 cell racing is HUGE.
My guess(based on running F1 2cell 21.5, car around 1050g, 67mmish roll out) would be start at 75mm. Thinking speeds would be about the same as 13.5t 1cell.