And the winner is...Firespeeder!
Created by A.D. (2-5) and L.L. (1-2) on Wednesday, February 12.
This vehicle traveled over 600 cm on each of half a dozen runs. Its farthest distance was over 765 cm...the distance to the wall which stopped it. How far would it have traveled in a longer hallway?
Firespeeder was of medium weight, medium length, and used the middle sized wheels. Axels were fixed in place and remained perpendicular to the track and parallel to each other. It was one of the simplest designs, using very few pieces. There was a little play between wheels on the same axel to accommodate any variations in the center guide on the track which prevented binding.