R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 12-21-2008, 02:51 PM   #1
Tech Adept
 
Join Date: Nov 2008
Location: Socal
Posts: 157
Trader Rating: 7 (100%+)
Send a message via AIM to sszzxx
Default Spools and diffentials

So ive been wanting to put a spool in the front of my tc5 since a lot of the setup sheets for outdoor asphalt drivers use spools in the front with a diff in the rear but really i dont know the difference between a spool and a diff can anyone help out. And what are the benefits between the two
sszzxx is offline   Reply With Quote
Old 12-21-2008, 03:04 PM   #2
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,865
Default

Spool is a solid axle, diff is a differential.
sosidge is offline   Reply With Quote
Old 12-21-2008, 03:20 PM   #3
Tech Apprentice
 
JeremyH's Avatar
 
Join Date: Jul 2008
Location: Houston, TX
Posts: 69
Default

To understand this, it is quite helpful to know how a differential in a 1:1 car works and why it is necessary. Here is a decent explanation including a movie of an open diff:
http://auto.howstuffworks.com/differential2.htm

A car requires the outside tire to rotate faster while turning to keep up with the inside tire. If this does not happen, then you will drag the outside tire around. However, because of this open diff, if one tire slips, then all of your power is being sent to that tire and not to the one with traction (because the slipping tire will spin easier).

A spool or locker will force the same amount of power to each tire. It negates the differentiation of the power that you see with an open diff. It is bad for turning, but good for forward motion. This is why I choose to lock the rear of my RCs and 1:1s and leave the fronts open.
JeremyH is offline   Reply With Quote
Old 12-21-2008, 03:28 PM   #4
Tech Master
 
Join Date: Jan 2005
Posts: 1,307
Default

I agree with Jeremy when he wrote the spool is bad for turning but good for forward motion.
As an experiment I replaced the one way in my RDX with a spool.The car pushed like a pig! I reinstalled the one way and put the spool in the rear.It felt like the car acclerated better.
outlandr91 is offline   Reply With Quote
Old 12-21-2008, 04:16 PM   #5
Tech Elite
 
trdsupra88's Avatar
 
Join Date: Jul 2007
Location: Southwest
Posts: 2,531
Trader Rating: 25 (100%+)
Send a message via Yahoo to trdsupra88
Default

If that is the case then why do people use spools? What does a slipper spool do vs. a spool?
trdsupra88 is offline   Reply With Quote
Old 12-21-2008, 04:38 PM   #6
Tech Apprentice
 
JeremyH's Avatar
 
Join Date: Jul 2008
Location: Houston, TX
Posts: 69
Default

A spool is used to put power down to the ground equally from both tires. Here is a picture of a buddy's jeep at a time when I locker/spool is needed:


You can see that the front Passenger tire is spinning and the front driver side tire is not. If he had that axle locked, then both would be turning and forward progress would have been made.

The same principle applies here.

Also, I have never hear of a "slipper spool"...
JeremyH is offline   Reply With Quote
Reply



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 12:14 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