View Single Post
Old 03-29-2012, 09:43 AM   #3 (permalink)
Aero Wannabe
COcyclist's Avatar
Join Date: Dec 2007
Location: NW Colo
Posts: 718

TDi - '04 VW Golf
90 day: 50.21 mpg (US)
Thanks: 690
Thanked 209 Times in 162 Posts
I don't know how secure the "plastic sheet" was supported or if there was a gap at the leading edge that wasn't sealed to the body? Is it possible you created a parachute that only bulged out at highway speeds? At any rate let's not make the blanket assertion that partial belly pans are bad, only that in this case it deserves more study.

My first belly pan prototype wasn't secured at the leading edge quite securely enough and was literally blown off by a gust of wind. (I was testing it on a deserted road at the time) Version 2.1 is very solid and has withstood being highsided on packed snow with no damage.
60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun

Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
  Reply With Quote