View Single Post
Old 12-05-2009, 10:45 AM   #8 (permalink)
Master EcoModder
Join Date: Nov 2009
Location: Leadville, CO
Posts: 509

Maroon Ballon - '98 Chrysler Town & Country LXI
90 day: 26.42 mpg (US)

MaEsTRO - '95 Geo Metro 5spd hatch, 3 cyl
Thanks: 47
Thanked 54 Times in 38 Posts
Originally Posted by basjoos View Post
I always wondered how Fred Flintstone was able to propel his car with just his feet. I guess those ultra-wide tires on his car produced some really low RR values.

I'm sure the width vs. RR curve has a point of diminishing returns.
I think I saw something about extremely low RR for stone tires (not Firestone), and a significant flywheel/gyroscopic effect once in motion.

I think wind tunnel test are done with the wheels stationary. A spinning wheel wouldn't show a change in frontal cA, but there must be a dynamic change in cD for an eggbeater style of wheel. Any quantitative studies on this?
  Reply With Quote