View Single Post
Old 01-09-2010, 03:09 PM   #11 (permalink)
aerohead
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,228
Thanks: 24,375
Thanked 7,357 Times in 4,757 Posts
Coastdown numbers for crx

Quote:
Originally Posted by aerohead View Post
3-Wheeler,just catching your post.My CRX data are at home,I will try to remember for tomorrow.I'm trusting my memory less and less now so rather than shoot off my mouth with nonsense I'll get the written materials together for you.Catch you then.
3-Wheeler,these are the values that CAR and DRIVER's computer came up with for the coastdown tests at Chrysler.I was not given the raw data set from the 5th-wheel.
The report I got broke the numbers down into road horsepower at three different velocities.
Test conditions at Chrysler were 49-DBF,42-WBF,29.15"Hg baro.,Calm.

velocity,MPH HP ( friction and tires ) HP (aero ) Road-HP
30 1.76 1.21 2.97
50 2.94 5.61 8.55
70 4.12 15.38 19.50
BSFC @ 70----------------------------------- 0.3988 LB/HP-HR
The CRX test weight was 1,926-lbs + 183 for Don and his equipment.
Tire pressure was 35-psi all around.
Coastdown included the aero drag of the optical 5th-wheel,as it was mounted to the passenger door.To date,I've never received info on the drag contribution of the 5th-wheel.I've estimated it's composite frontal area and composite Cd and will address that in a separate thread.

  Reply With Quote
The Following User Says Thank You to aerohead For This Useful Post:
3-Wheeler (01-09-2010)