XRAY - Model racing cars

It is currently Tue Aug 22, 2017 09:33:26

All times are UTC + 2 hours




Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: FDR
PostPosted: Mon Feb 06, 2017 19:07:25 
Offline

Joined: Sun Oct 06, 2013 02:45:31
Posts: 4
I always be able to figure the FDR for 2wd, however for xb4 4wd with 1:2.5 ratio how do I do the formula ?

the decimals are different ? (:) (.)

AE SC5M 2.60:1 ratio Spur 84/19
84/ 19= 4.42 x 2.60 = 11.5 FDR for 6.5 motor

XB4 81/20=4.05 x 1.2:5 ??? getting 4.86 fdr


Top
 Profile  
 
 Post subject: Re: FDR
PostPosted: Wed Mar 01, 2017 10:06:00 
Offline

Joined: Mon Sep 13, 2004 22:18:00
Posts: 33
Location: Seattle, USA
The internal ratio of the XB4 is 2.5 (35/14) , so the FDR in your example (81 spur / 20 pinion) is 10.125.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC + 2 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group