R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 06-19-2006, 04:30 AM   #1
Tech Regular
 
RocketRacer's Avatar
 
Join Date: Mar 2006
Location: Durban South Africa
Posts: 337
Default rollout and gearing

ok here is my situation. i know how to calculate gearing and rollout perfectly. my questions are:

1. How do i figure out what rollout to use for different types of motors??
2. how do i figure out what rollout to use with different types of tracks?

thanks in advance
__________________
RocketRacer
XRay T2'008/Nosram ISTC/Nosram 13.5T Spec

Futaba 3PKS with FASST

>>>Knowledge is Power<<<
RocketRacer is offline   Reply With Quote
Old 06-19-2006, 05:34 AM   #2
Tech Master
 
1fastdude's Avatar
 
Join Date: Apr 2002
Location: Sinsinnati
Posts: 1,938
Trader Rating: 15 (100%+)
Default

To figure out rollout for different tracks, try starting at what you had at the last track you ran on. This is a good starting point. You can go up or down from there. Also you can ask someone that runs there and uses the same motor that you are using.
For different motors you can apply the same strategy!
__________________
★RCAmerica •Xray •Hudy •BSR/Jaco •Absolute Hobbyz •Gravity RC •PROTOform •Avid •TQ Racing Wire •C & M Motorsports ★
1fastdude is offline   Reply With Quote
Old 06-19-2006, 05:51 AM   #3
Tech Addict
 
Join Date: May 2006
Posts: 732
Trader Rating: 10 (100%+)
Default

One way to use it for gearing is if you have a dyno and you know the rpm of both motors and you know your current rollout.SO lets say your rollout is 1.75
the motor you just ran was 16,000 rpm and you know the motor you want to put in is 14,500 it would look something like this 1.75X(16000/14500)=1.93 the 1.93 number that it outputs is where your car needs be with the new motor.

Last edited by bill941; 06-19-2006 at 05:47 PM.
bill941 is offline   Reply With Quote
Old 06-19-2006, 07:42 AM   #4
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,214
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by bill941
One way to use it for gearing is if you have a dyno and you know the rpm of both motors and you know your current rollout.SO lets say your rollout is 1.75
the motor you just ran was 16,000 rpm and you know the motor you want to put in is 14,500 it would look something like this 1.75X(16000/14000)=1.93 the 1.93 number that it outputs is where your car needs be with the new motor.
simple enough
Marcos.J is offline   Reply With Quote
Old 06-19-2006, 05:44 PM   #5
Tech Addict
 
Join Date: May 2006
Posts: 732
Trader Rating: 10 (100%+)
Default

no not really but I have been working on a excel sheet that all you do is type it in kind of like a end all sheet for gearing,rollout and so forth.
bill941 is offline   Reply With Quote
Old 06-19-2006, 05:48 PM   #6
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,214
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by bill941
no not really but I have been working on a excel sheet that all you do is type it in kind of like a end all sheet for gearing,rollout and so forth.
or just use this one!
http://www.gearchart.com/index.cfm?f...n=chart.create
thats what I did
Marcos.J is offline   Reply With Quote
Old 06-20-2006, 07:59 PM   #7
Tech Adept
 
tdu verney's Avatar
 
Join Date: Mar 2005
Location: Del City Speed Shop
Posts: 226
Default Gearing

I was testing gear ratio's Saturday. 30/100 What are the effects of changing a spur gear? If I reduce total teeth or add teeth?
tdu verney is online now   Reply With Quote
Old 06-20-2006, 08:06 PM   #8
Tech Elite
 
HarshGuy's Avatar
 
Join Date: Aug 2001
Location: Roseville, CA
Posts: 3,379
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by tdu verney
I was testing gear ratio's Saturday. 30/100 What are the effects of changing a spur gear? If I reduce total teeth or add teeth?
Go to www.gearchart.com and see what changes it makes, pretty easy, plug in your values, click the "Gear Ratio" button, then change the spur gear size and click "Gear Ratio" again, mess with the spur gear some more, just keep clicking "Gear Ratio" after each change.
__________________
http://www.arroyoc.com
http://www.gearchart.com
http://www.weracemountainbikes.com
HarshGuy is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rollout / Gearing? Drifter73 Electric On-Road 9 03-06-2009 06:00 AM
Gearing / Rollout? TheOtherNut Electric On-Road 3 02-19-2008 11:30 AM
GEARING/ROLLOUT QUESTION oldfart Electric On-Road 7 06-25-2007 11:42 AM
1:12 Scale Brushless Gearing or Rollout? Decathalon Electric On-Road 6 05-29-2006 04:48 AM
Rollout Figures For Gearing Calculations Steevo Electric On-Road 16 10-08-2002 05:05 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -7. It is currently 05:01 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net