R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 06-07-2006, 07:39 AM   #1
Tech Rookie
 
Join Date: Jun 2005
Posts: 13
Default chose spur gear?

I play ta05 , the original spur gear is 64p 105t, can I use 100t?(with same final gear ratio 8.0 for 12turn)
I felt 100t is faster then 105t (8.0 final) .
what spur gear is the best? if I use smaller spur gear , what side effect will occure(heat raise)? will it hurt the esc? can i notice it?
what is the limit/concern of choosing spur gear?
thanks!
gtimax is offline   Reply With Quote
Old 06-07-2006, 09:14 AM   #2
Regional Moderator
 
Darkseid's Avatar
 
Join Date: Aug 2001
Location: At my computer, duh...
Posts: 9,033
Trader Rating: 8 (100%+)
Default

Well I'll take a shot at answering this...

IF your currently using a 108t spur and your final is around 8.0, then your likely using a 30t pinion. (108/30=3.6*2.25=8.1 final)

So if you drop down to a 100t spur and keep the same pinion, you'll end up with a final of 7.5(100/30=3.333...*2.25=7.5 final)

The result of this is that you will have more heat in your motor and speed control, and the ratio is probably a bit too low for a 12turn mod.

Now if your trying to go to a 100t spur while still keeping the final around 8.0, then you'll have to go down on your pinion size to something like a 28t pinion. That will give you a final right around 8.04.(100/28=3.57*2.25=8.04)

The only concerns that you really have with picking a spur gear is:
1. does it fit (most spur gears fit the Tamiya mount)
2. what ratio do you want
3. can the spur and pinion fit with the size gears you've choosen. In other words, will a small spur reach a small pinion and/or will a large spur still fit with the large pinion you want to use.

I hope the answer you were looking for was somewhere in all of that.
__________________
TLR 22...Tamiya F104...
Darkseid is offline   Reply With Quote
Old 06-07-2006, 09:19 AM   #3
Tech Rookie
 
Join Date: Jun 2005
Posts: 13
Default

thanks for the reply
are you meaning that it is no different if the final ratio not change?
I heard that the loading will be higher if the spur gear is smaller and the top speed will higher when the final ratio is not changed. the problem is I don't know the limit is?
gtimax is offline   Reply With Quote
Old 06-07-2006, 09:24 AM   #4
Regional Moderator
 
Darkseid's Avatar
 
Join Date: Aug 2001
Location: At my computer, duh...
Posts: 9,033
Trader Rating: 8 (100%+)
Default

That is what I'm saying.

If your final ratio is still 8.0, then whether your using 108/30 -or- 100/28 it will still feel the same and be the same temp wise.

That is what I've always known, but if there is someone with contradictory information, maybe they'll share it. (I'm always looking to learn something new )

But as far as I know, the final ratio is the final ratio...no matter what the gear combination is.

On my TA05 I went from using a 100t spur to using a 98t spur(broke a spur gear tooth that day and shop didn't have another 100t) and I just change the pinion to keep me at around the same final ratio. I never noticed any difference in the motor or speedo temp, or in the car performance.
__________________
TLR 22...Tamiya F104...
Darkseid is offline   Reply With Quote
Old 06-08-2006, 04:56 AM   #5
Tech Rookie
 
Join Date: Jun 2005
Posts: 13
Default

anyone have an idea?
gtimax is offline   Reply With Quote
Old 06-08-2006, 06:23 AM   #6
KoE
Tech Master
 
KoE's Avatar
R/C Tech Charter Subscriber
 
Join Date: Aug 2003
Location: Blue Marble
Posts: 1,228
Trader Rating: 6 (100%+)
Send a message via Yahoo to KoE
Default

i'm going along with darkseid on the spur/pinion combo & fdr thingy but i believe you are looking for discussion on this ==> Gearing Technique - Better Acceleration (http://www.rctech.net/forum/showthread.php?p=450829 )
__________________
Yo!
KoE is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
LOOKING FOR SPUR GEAR RC 10 GT FIELDS R/C Items: Wanted to Buy 4 05-18-2008 03:17 PM
Gear Ratios/ Spur Gear Sparky7B Rookie Zone 2 02-26-2008 10:03 PM
Jammin Diff, w/ Lightened Spur And Extra Spur Gear prphze R/C Items: For Sale/Trade 0 10-07-2007 03:40 PM
Spur gear for TC4? Arboleda Electric On-Road 2 05-09-2007 04:42 PM
TC3 spur gear... AZNracerx1989 Rookie Zone 3 08-02-2005 07:58 PM



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 10:13 AM.


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