Go Back   EcoModder Forum > EcoModding > Motorcycles / Scooters
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-02-2012, 08:14 PM   #1 (permalink)
Master EcoModder
 
Join Date: Aug 2011
Location: East coast of Australia
Posts: 393

Yella Peril - '80 Mercedes 240D sedan
Thanks: 15
Thanked 41 Times in 17 Posts
What is the best road useful cd?

Using the calculator this forum kindly provides and working through various fairing shapes and real world testing is interesting .
For instance this Royal Enfield Dreamliner from 1953 that I've posted before works out at a cd of .66 from the published speed and fuel consumption figures .



Not a bad figure for something built primarily as a weather protection shield with some consideration of drag . When we come to something like Craig Vetter's fairing though things have really improved !



At the moment it seems Mr Vetter's fairing is about as good as it is possible to get bearing in mind the problems with a perfect NACA foil ....ie side lift in traffic and disturbed air . The openings at the sides seem sufficient to spoil the side lift but still provide a good airflow .

Does anyone know the cd of the Vetter fairing ?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-02-2012, 09:04 PM   #2 (permalink)
Master EcoModder
 
Join Date: Jan 2010
Location: Alberta Canada
Posts: 744

redyaris - '07 Toyota Yaris
Team Toyota
90 day: 45.54 mpg (US)

Gray - '07 Suzuki GS500 F
Motorcycle
90 day: 70.4 mpg (US)

streamliner1 - '83 Honda VT500 streamliner
Motorcycle
90 day: 75.63 mpg (US)

White Whale - '12 Sprinter 2500 Cargo Van
90 day: 22.01 mpg (US)
Thanks: 81
Thanked 75 Times in 67 Posts
If the frontal area is 7 sq ft I would guess that the Cd is around 0.35 ???
  Reply With Quote
Old 04-02-2012, 09:10 PM   #3 (permalink)
Master EcoModder
 
Join Date: Aug 2011
Location: East coast of Australia
Posts: 393

Yella Peril - '80 Mercedes 240D sedan
Thanks: 15
Thanked 41 Times in 17 Posts
.35 ?! That would be remarkable especially with the side openings, I hope you are right . Even .5 would be spectacular on a bike .
  Reply With Quote
Old 04-04-2012, 11:41 PM   #4 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Elmira, NY
Posts: 1,781
Thanks: 319
Thanked 355 Times in 297 Posts
With some engineering and modelling work 0.2 may be possible.
  Reply With Quote
Old 04-05-2012, 01:12 AM   #5 (permalink)
Master EcoModder
 
alvaro84's Avatar
 
Join Date: Jul 2010
Location: Fehérvárcsurgó, Hungary
Posts: 384

Teresa - '04 BMW F650CS
Motorcycle
90 day: 80.53 mpg (US)

The YARDIS - '99 Toyota Yaris 1.0
90 day: 59.52 mpg (US)
Thanks: 4
Thanked 11 Times in 10 Posts
Quote:
Originally Posted by Grant-53 View Post
With some engineering and modelling work 0.2 may be possible.
Do you mean with side openings?
  Reply With Quote
Old 04-05-2012, 03:18 PM   #6 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Elmira, NY
Posts: 1,781
Thanks: 319
Thanked 355 Times in 297 Posts
Probably not. I am working on both styles. It is a hot topic what with side wind loads and egress issues. It depends on preventing flow separation at maximum width along the shoulder to hip line.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com