Author Topic: Rolling Resistance  (Read 47303 times)

0 Members and 1 Guest are viewing this topic.

Ratliff

  • Guest
Rolling Resistance
« on: May 30, 2008, 09:50:09 PM »
The formula I have is N = W x V x T / 270 where N is the power required, W is the weight in kilograms, V is the speed in kilometers per hour, and T is the rolling resistance of the tire.
 
The factors are
T = 0.015 on concrete
T = 0.025 on crushed rock/asphalt
T = .05 unpaved dirt road
T = .10 dirt field
 
The estimate for T on wet salt at Bonneville is .04 to .05
 
This is an older formula but should still give useful results.

dwarner

  • Guest
Re: Rolling Resistance
« Reply #1 on: May 31, 2008, 09:07:34 AM »
"This is an older formula but should still give useful results."

To a question not asked.

DW

Ratliff

  • Guest
Re: Rolling Resistance
« Reply #2 on: May 31, 2008, 09:11:39 AM »
"This is an older formula but should still give useful results."

To a question not asked.

DW

Responded to by a person who doesn't know there are multiple formulas for calculating rolling resistance.

dwarner

  • Guest
Re: Rolling Resistance
« Reply #3 on: May 31, 2008, 09:47:46 AM »
Pressing ignore again.

DW

Offline John Noonan

  • Hero Member
  • *****
  • Posts: 3606
  • 306 200+ mph time slips. 252 mph on a dirtbike
Re: Rolling Resistance
« Reply #4 on: May 31, 2008, 02:43:04 PM »
Pressing ignore again.

DW

Dan all you have to do is resist the "desire" to press the ingnore feature and after a day or so it will be very easy. :mrgreen: and this is all you will see "This user is currently ignored."

J

Offline John Noonan

  • Hero Member
  • *****
  • Posts: 3606
  • 306 200+ mph time slips. 252 mph on a dirtbike
Re: Rolling Resistance
« Reply #5 on: June 02, 2008, 11:23:29 PM »
Pressing ignore again.

DW

Dan all you have to do is resist the "desire" to press the ingnore feature and after a day or so it will be very easy. :mrgreen: and this is all you will see "This user is currently ignored."

J


15 now...

Offline John Noonan

  • Hero Member
  • *****
  • Posts: 3606
  • 306 200+ mph time slips. 252 mph on a dirtbike
Re: Rolling Resistance
« Reply #6 on: June 03, 2008, 01:10:33 AM »
Updated 16 now...wow

Offline Dr Goggles

  • Hero Member
  • *****
  • Posts: 3120
  • The Jarman-Stewart "Spirit of Sunshine" Bellytank
    • "Australian Bellytank" , http://thespiritofsunshine.blogspot.com/
click!
« Reply #7 on: June 03, 2008, 01:36:41 AM »
make that 17
Few understand what I'm trying to do but they vastly outnumber those who understand why...................

http://thespiritofsunshine.blogspot.com/

Current Australian E/GL record holder at 215.041mph

THE LUCKIEST MAN IN SLOW BUSINESS.

Offline bvillercr

  • Hero Member
  • *****
  • Posts: 2291
Re: Rolling Resistance
« Reply #8 on: June 03, 2008, 01:37:29 AM »
 :-o :-o

Offline salt27

  • Hero Member
  • *****
  • Posts: 1734
Re: Rolling Resistance
« Reply #9 on: June 03, 2008, 01:58:15 AM »
Updated 16 now...wow
John,
I stand corrected.
Don

Offline panic

  • Sr. Member
  • ****
  • Posts: 845
    • My tech papers
Re: Rolling Resistance
« Reply #10 on: June 03, 2008, 09:14:13 AM »
Slowly it dawns on me.
Posts here are evaluated as follows:
1. peer rank of author: 99%
2. accuracy or factual content: 1%

Offline John Noonan

  • Hero Member
  • *****
  • Posts: 3606
  • 306 200+ mph time slips. 252 mph on a dirtbike
Re: Rolling Resistance
« Reply #11 on: June 03, 2008, 12:16:35 PM »
18 now

Offline ddahlgren

  • Global Moderator
  • Full Member
  • ***
  • Posts: 272
Re: Rolling Resistance
« Reply #12 on: June 04, 2008, 03:16:37 PM »
ROTFLMAO.... :-D
Will it go up yet again?  :?

Blue

  • Guest
Re: Rolling Resistance
« Reply #13 on: June 04, 2008, 06:36:24 PM »
Slowly it dawns on me.
Posts here are evaluated as follows:
1. peer rank of author: 99%
2. accuracy or factual content: 1%
I think those ignore buttons are being pressed by racers and builders.  The person they're ignoring is neither. :roll:

Personally, I expect that my own peer rank in this group should be low until I have some of my work actually running down the salt or dirt.

I have seen less than one in ten posts of the nearly 200 he has deluged us with in one week be both applicable to topic and not obsolete.  That's a lot of good posts, but it's just too many bad ones.  Right now, he's creating a massive percentage of the traffic on this site and devoting that space to (for lack of a better term) spam.

I tried to put up with it, but now I'm #18.

Offline panic

  • Sr. Member
  • ****
  • Posts: 845
    • My tech papers
Re: Rolling Resistance
« Reply #14 on: June 04, 2008, 10:41:04 PM »
I'd like to know more about the motivation behind the public display of righteous indignation "I pressed the ignore button".
This is, of course, the exact opposite of ignoring him, but instead commenting on him rather than his post.