R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 09-07-2007, 08:39 PM   #1
Tech Initiate
 
Join Date: Feb 2006
Location: Gastonia NC
Posts: 26
Send a message via AIM to cycleeric Send a message via Yahoo to cycleeric
TC3 run times

Im converting a TC3 into a Late Model dirt oval racer and owndering what kind of run times can I expect with a 10t and 19t motor with 4200mah NiCD or a Lipo? What would be the difference between the 2 motors and batteries? Can I run it with a higher voltage battery and what would be the advantage of that?

Sorry for all the questions but Im a newbie at Electric, I've been running Nitro for a couple years.

Thanks
cycleeric is offline   Reply With Quote
Old 09-07-2007, 08:53 PM   #2
Tech Master
 
Join Date: Nov 2003
Posts: 1,052
Trader Rating: 16 (94%+)
Default

A complete guesstimate, but I think 4200's with a 19-turn will get you into the 9-12 minute range, but a 10-turn would be in the 6-8 minute range. All depends on traction conditions. Better traction will cause higher amperage draw from the batteries on acceleration.

As for the TC3, I hope you have a solution for the TC3's steering rack. It is notorious for trapping small rocks, dirt, debris, etc. causing the steering to bind or lock.

FYI - 4200 batteries are NiMH, not NiCd.
kn7671 is offline   Reply With Quote
Old 09-08-2007, 12:09 PM   #3
Tech Adept
 
Hick's Avatar
 
Join Date: Jun 2005
Location: Purgatory, AZ
Posts: 132
Default

Quote:
Originally Posted by cycleeric View Post
Im converting a TC3 into a Late Model dirt oval racer and owndering what kind of run times can I expect with a 10t and 19t motor with 4200mah NiCD or a Lipo? What would be the difference between the 2 motors and batteries? Can I run it with a higher voltage battery and what would be the advantage of that?

Sorry for all the questions but Im a newbie at Electric, I've been running Nitro for a couple years.

Thanks
After two or three hot laps before the Main, then a 5 minute Main, I have taken 4200 Nimihs, placed them on a bulb (30 amp) discharge string and timed them and had an average of 1 to 1 1/2 minutes charge left in them with a 10D motor. Now after running LiPo's the same way, I have recharged them and only put a max of 2400mah in them. Not very scientific, but just some ballpark information.

Difference between the motors (19T and 10T) is thousands of RPM's and how the motor makes it torque.

Most of my motor tuning has been done at 5 volts on a Dyno. Over time, I found that motor turning 33000 rpm at 5 volts; at 7.2 volts it will turn roughly 47520 rpm. With a 7.4 LiPo the same motor will turn 48840 rpm - - - initially. Again, not in controlled environs, just ballpark information.

Unlike gassers where you have a consistant power* throughout your race, whereas Electrics loose power. At the start of a race, a NiCad/NiMih will put out 7.6 plus volts in the first 15-20 seconds then the voltage will fall off in a curve, lets say, .03 volts every 15-20 seconds until a point where it will being to fall of more rapidly. This battery performance curve varies with the battery type & manufacture, gearing on the car, motor load, car set up and the driver. Again, not scientific, just ballpark information.

While I have given some numbers on motor rpm and battery performance; these are, even though not concrete and will be disputed. The discribed behaviour of these components exist to one degree to another - always.

*Then there is the problem of heat build-up, a problem that exists with both types of toys. Electrics have more heat build up throughout their components (speed controller, battery, wiring and motor) more so than gassers. Sort of like having a pinched fuel line.

Though lengthy, I can only hope this answers at your questions or at least get you in the ballpark.

There are several threads over at DirtOval.Com that will help you with your endeavors in converting your TC3. Use the forums "search" for faster results. Have fun!
Hick is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
old times willabong Australian Racing 20 05-07-2007 04:34 AM
WTB lst for fun times duce duce R/C Items: Wanted to Buy 4 01-30-2007 10:13 AM
how many times a day? kh15 Electric On-Road 2 08-10-2004 10:04 AM
run times h22ah Electric On-Road 13 04-15-2004 05:21 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 04:37 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