Go Back  R/C Tech Forums > General Forums > Electric On-Road
Underweight car? been thinking.... >

Underweight car? been thinking....

Underweight car? been thinking....

Old 02-24-2010, 03:46 AM
  #1  
Tech Champion
Thread Starter
 
tc3team's Avatar
 
Join Date: Mar 2006
Location: UK
Posts: 6,151
Default Underweight car? been thinking....

If you had an underweight car, what would be the outcome of using heavier wheels?...

Im just curious and thinking outside of the box here!
tc3team is offline  
Old 02-24-2010, 04:02 AM
  #2  
Tech Initiate
 
Join Date: Jan 2010
Location: Perth, Western Australia
Posts: 49
Default

Heavier wheels would increase the inertia in the unsprung portion of your suspension, making it more difficult for the dampers to control the movement of the wheel as it moves over a bump. You are much better off adding the weight to the chassis rather than the wheels.
Oggie is offline  
Old 02-24-2010, 04:04 AM
  #3  
Tech Champion
Thread Starter
 
tc3team's Avatar
 
Join Date: Mar 2006
Location: UK
Posts: 6,151
Default

Thanks Quiet day at work with too much thinking!
tc3team is offline  
Old 02-24-2010, 04:36 AM
  #4  
Tech Elite
 
niznai's Avatar
 
Join Date: Feb 2009
Location: All over the place
Posts: 2,965
Default

Not to mention the angular momentum which would make it really difficult to turn those wheels to go around corners once they get up to speed. Not a good idea at all.
niznai is offline  
Old 02-24-2010, 08:31 AM
  #5  
Tech Master
iTrader: (1)
 
Join Date: Feb 2009
Posts: 1,920
Trader Rating: 1 (100%+)
Default

bit of info here on sprung/unsprung weight advantages/disadvantages

http://en.wikipedia.org/wiki/Unsprung_mass
sidecarphil1 is offline  
Old 02-24-2010, 11:55 AM
  #6  
Tech Fanatic
 
Join Date: Jun 2005
Posts: 900
Default

Not to mention the slower acceleration and longer braking distance due to the increased rotating mass to be accelerated and decelerated. Large rotating weights can be a bigger enemy to fast lap times than having too high a static weight in the car.

Maybe the biggest clue to this not being your best plan is that there is not a single full-size race car that uses wheels any heavier than they need to be. HTH
SlowerOne is offline  
Old 02-24-2010, 12:07 PM
  #7  
Tech Champion
Thread Starter
 
tc3team's Avatar
 
Join Date: Mar 2006
Location: UK
Posts: 6,151
Default

All great answers, thanks

It was merely one of those "what if" moments I thought about....
tc3team is offline  
Old 02-24-2010, 12:18 PM
  #8  
Tech Elite
iTrader: (124)
 
vr6cj's Avatar
 
Join Date: Jul 2008
Location: Modesto, CA
Posts: 4,052
Trader Rating: 124 (100%+)
Default

But if you had say a great bit of torque to spare.... you would have a faster straight away speed and wouldnt it be faster from a rolling start? But it's alll about the unsprung weight deal again. Less weight on drivetrain is always better.
vr6cj is offline  
Old 02-24-2010, 12:50 PM
  #9  
Tech Fanatic
iTrader: (17)
 
94eg!'s Avatar
 
Join Date: Jan 2008
Posts: 832
Trader Rating: 17 (100%+)
Default

Originally Posted by vr6cj View Post
But if you had say a great bit of torque to spare.... you would have a faster straight away speed and wouldnt it be faster from a rolling start? But it's alll about the unsprung weight deal again. Less weight on drivetrain is always better.
more rotating mass = harder to start, harder to stop. You should have the same top speed, but it would take you longer to get there...
94eg! is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.