Got the second run down today with the X642 and high timing, it definatly bumped up the speed, first run it topped out at 35mph (my estimate) and now its up to 40mph.
The strut was way to high because i was prop walking at top speed and getting major bounce. I bet if i eliminate this i could get it to go 45mph.
I will have to play around with it and keep adjusting the CG and the strut hight to get to run smooth.
My mom video taped this so it isnt the best video.
Keep in tune!