View Single Post
Old 12-22-2011, 10:56 PM   #21 (permalink)
3-Wheeler
Master EcoModder
 
3-Wheeler's Avatar
 
Join Date: Dec 2008
Location: Southern WI
Posts: 827

AlienMobile - '00 Honda Insight
Team Honda
90 day: 80.05 mpg (US)
Thanks: 101
Thanked 560 Times in 191 Posts
Quote:
Originally Posted by drmiller100 View Post
I did a bunch of calcs, and rolling resistance is ALWAYS the least significant of the three items I listed. At low speeds we assume city traffic with start/stop, and in that case the energy to accelerate the car is by far the biggest contributor.

At high speed (over 40 mph) aero is the biggest issue.

If you have a heavy car at low speed, then acceleration of the car is the biggest issue. If you have a light car at low speed, then acceleration of the car is still the biggest issue.

Your thoughts?
What con
Hi Mr Miller,

Can you list your calculations?

I would like to know how Crr is always less than Cd?

At the speeds I typically drive, Crr is actually larger than Cd (38 mph).

Jim.

  Reply With Quote