R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 06-03-2010, 01:21 PM   #31
Tech Master
 
ShortCourseOnly's Avatar
 
Join Date: Feb 2010
Location: São Paulo, Brazil
Posts: 1,192
Send a message via Skype™ to ShortCourseOnly
Default

OK so for 4x4 SCT it would be better to get the RX8 then so that you can manage the temps. Is the RX8 overkill for the SC4X on 2S?
__________________
--- American in Brazil!!! --- Viva Brasil! ----
Associated RC8.2 FT/Reedy 121VR Engine/Panther tires
Associated SC10 FT/Havoc Pro SC/Ballistic 7.5t
Associated SC10 4x4/Havoc Pro SC/Ballistic 550 4.5t
Traxxas Rally Custom Edge/Ballistic 540 10.5t
ShortCourseOnly is offline   Reply With Quote
Old 06-03-2010, 01:23 PM   #32
Tech Master
 
ShortCourseOnly's Avatar
 
Join Date: Feb 2010
Location: São Paulo, Brazil
Posts: 1,192
Send a message via Skype™ to ShortCourseOnly
Default

Quote:
Originally Posted by Krio View Post
Time for some more 4wd SCT's to show up so we can bomb their transmissions running 3 or 4s with these bad boys.
Are we going to see you in the 4x4 SCT class soon then Krio?
__________________
--- American in Brazil!!! --- Viva Brasil! ----
Associated RC8.2 FT/Reedy 121VR Engine/Panther tires
Associated SC10 FT/Havoc Pro SC/Ballistic 7.5t
Associated SC10 4x4/Havoc Pro SC/Ballistic 550 4.5t
Traxxas Rally Custom Edge/Ballistic 540 10.5t
ShortCourseOnly is offline   Reply With Quote
Old 06-03-2010, 01:26 PM   #33
Tech Master
 
ShortCourseOnly's Avatar
 
Join Date: Feb 2010
Location: São Paulo, Brazil
Posts: 1,192
Send a message via Skype™ to ShortCourseOnly
Default

Quote:
Originally Posted by Krio View Post
It can supply the amperage, but not sustained. The heat build-up would put you thermalling before your race ended. Heat sinks go a LONG way when determing the "constant" current compared to the "rating per phase" current. The RX8 actually has fewer fets than the RSpro, but it bleeds the heat created away much more efficiently since all the fets are on the top and in contact with the heat sink at the expense of the overall size of the unit.
The ultimate setup would be an optional aluminum lower case for the RSpro along with some thermal double sided tape to heat sink the ESC to the aluminum chassis. You'd never get your esc 10 degrees over ambient.
This actually explains a lot. So the heat sink on the RS family is on the lower part of the case. I thought the solder posts were providing heat disipation. Sounds like an opportunity to improve an already good design.
__________________
--- American in Brazil!!! --- Viva Brasil! ----
Associated RC8.2 FT/Reedy 121VR Engine/Panther tires
Associated SC10 FT/Havoc Pro SC/Ballistic 7.5t
Associated SC10 4x4/Havoc Pro SC/Ballistic 550 4.5t
Traxxas Rally Custom Edge/Ballistic 540 10.5t
ShortCourseOnly is offline   Reply With Quote
Old 06-03-2010, 01:50 PM   #34
Tech Elite
 
Krio's Avatar
 
Join Date: Mar 2008
Location: At dirt tracks in Michigan!
Posts: 4,921
Trader Rating: 150 (99%+)
Default

Quote:
Originally Posted by ShortCourseOnly View Post
OK so for 4x4 SCT it would be better to get the RX8 then so that you can manage the temps. Is the RX8 overkill for the SC4X on 2S?
The rx8 is overkill, but it would be as worry free as it gets! If you don't mind losing sensored only to play with boost (which really isn't necessary) and a bump up in size the rx8 and sc4x would be hard pressed to overheat even if driven in hell. (Hell, Michigan that is.)

Quote:
Originally Posted by ShortCourseOnly View Post
Are we going to see you in the 4x4 SCT class soon then Krio?
I can't bring myself to run any of the current 4wd's "knowing" new ones are right around the corner, so probably not anytime durring this summers outdoor series. I plan on getting a 4wd as soon as there are more options.

Quote:
Originally Posted by ShortCourseOnly View Post
This actually explains a lot. So the heat sink on the RS family is on the lower part of the case. I thought the solder posts were providing heat disipation. Sounds like an opportunity to improve an already good design.
Unlike most esc's, the fets are on the bottom of the case with the control board on top. Most heat sinks are transfering the heat to the air and that is what the posts do for the most part, but I purposely used a very thin layer of shoe goo to mount my RSpro in my (soon to be sold to make room for the future) B44 to maximize heat transfer to the chassis. There were experiments with aluminum lower cases when mod tc was all the rage and when the RSpro was being used in 8th scale buggies, but mod died and the RX8 came out.
__________________
www.kriostasis.com
Krio is offline   Reply With Quote
Old 06-03-2010, 02:02 PM   #35
Tech Regular
 
Buggy Brad's Avatar
 
Join Date: Nov 2007
Location: NewHampshire
Posts: 418
Default

I run the RS(not pro) in my slash with the HV4.5 on 2s, geared 13/54 and I was seeing 160-170 temps on the speed control with ambient temps in the 70's and low humidity. I added a fan and temps went down to the 100 degree range, even with 90+ temps and very humid. It's been a few months now with this set-up and a hundred cycles later all is still working great.........BB
__________________
.....It's not a problem until it's on fire....
Buggy Brad is offline   Reply With Quote
Old 06-03-2010, 02:11 PM   #36
Tech Elite
 
SaladFork's Avatar
R/C Tech Elite Subscriber
 
Join Date: Nov 2009
Location: Seattle
Posts: 3,349
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by [email protected] View Post
Something sounds wrong there, it should free spin in sensored very easily. That sounded like it was trying to go for a couple of seconds with you holding it there and then it finally went. Not good. 107 is nothing for heat by the way. If it was 200, that would be a problem. And your servo (i think that's what I'm hearing) is also sitting there in a bind, which will stress the BEC and heat the ESC up quickly too. Try another servo.

The RSPro handles that application just fine, it sounds like that one is having trouble with the sensors on the motor and it is not starting cleanly and it sounded bad even after it was spinning in the low throttle.

I have been running a 4x4 Slash on an RSPro and our 7.5T redline 1/10 motor with a 13mm torque rotor with no issues the past 6 months. There is no reason the RSPro wouldn't handle the 550 motors.
Yea the RSP will not work with this motor, I tried two different ones. It runs fine on the MMP so I know it's not the sensor port or wire. I talked with Shawn about it at Speed Passion and he also said it should work fine. I have no idea what the issue is. And I tried another servo, I tested it in two trucks with two different servos.

I hear and read all the time about people using the RSP with the HV's with no problem (I was one of them). Could it be possible I have two bad RS Pros? One is already being sent back, but the other one I don't think is messed up I plan on using the Ballistic 550 with it.

And the temp hit 210 last weekend, that vid was just on my bench without the motor meshed, it got up to 130 then I shut it off.
__________________
TLR | AE | AKA | Viper |
SaladFork is offline   Reply With Quote
Old 06-03-2010, 02:23 PM   #37
Tech Elite
 
Krio's Avatar
 
Join Date: Mar 2008
Location: At dirt tracks in Michigan!
Posts: 4,921
Trader Rating: 150 (99%+)
Default

Quote:
Originally Posted by SaladFork View Post
And the temp hit 210 last weekend, that vid was just on my bench without the motor meshed, it got up to 130 then I shut it off.
How many leds were lighting up? Reading a glossy plastic item with a temp gun set for the emissivity of aluminum doesn't really do a whole lot.
__________________
www.kriostasis.com
Krio is offline   Reply With Quote
Old 06-03-2010, 02:27 PM   #38
Tech Elite
 
SaladFork's Avatar
R/C Tech Elite Subscriber
 
Join Date: Nov 2009
Location: Seattle
Posts: 3,349
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by Krio View Post
How many leds were lighting up? Reading a glossy plastic item with a temp gun set for the emissivity of aluminum doesn't really do a whole lot.
All the lights where on (used to only be 3-4 lights)... I was using the nitro node from my spektrum which I had on top not on the bottom of the ESC. I never broke out the heat gun, just un-soldered it and put it away.
__________________
TLR | AE | AKA | Viper |
SaladFork is offline   Reply With Quote
Old 06-04-2010, 12:07 PM   #39
Tech Addict
 
GasserX's Avatar
 
Join Date: Dec 2005
Posts: 513
Trader Rating: 5 (100%+)
Default

build a fan mount that holds the fan at a 45 degree angle down toward the wire posts. Dropped the temp down to one light from four with a 6.5 in a mod truck.
__________________
LOSI 8E 4.0
LOSI 22-4 V1.5
LOSI 22 3.0 Dirt Laydown
GasserX is offline   Reply With Quote
Old 06-04-2010, 01:28 PM   #40
Tech Elite
 
Zerodefect's Avatar
 
Join Date: Apr 2008
Location: Underground, Ohio
Posts: 4,304
Default

The RX8 cost $30 less than the RS pro (amain).

And 4x4 SCT's have plenty of room under the hood. Why bother with the pro, unless you allready have one?
Zerodefect is offline   Reply With Quote
Old 06-04-2010, 03:04 PM   #41
Team Tekin
 
TY@TEAMTEKIN's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2006
Location: Tekin
Posts: 2,461
Default

Quote:
Originally Posted by SaladFork View Post
Yea the RSP will not work with this motor, I tried two different ones. It runs fine on the MMP so I know it's not the sensor port or wire. I talked with Shawn about it at Speed Passion and he also said it should work fine. I have no idea what the issue is. And I tried another servo, I tested it in two trucks with two different servos.

I hear and read all the time about people using the RSP with the HV's with no problem (I was one of them). Could it be possible I have two bad RS Pros? One is already being sent back, but the other one I don't think is messed up I plan on using the Ballistic 550 with it.

And the temp hit 210 last weekend, that vid was just on my bench without the motor meshed, it got up to 130 then I shut it off.
It should work just fine, there is no reason it wouldn't. It sounds like a sensor issue and it's not running smooth.
__________________
Ty Campbell
TEKIN / TLR / SOR GRAPHICS / MIP / PROTEK / KALGARD / AVID
TY@TEAMTEKIN is offline   Reply With Quote
Old 06-04-2010, 03:49 PM   #42
Tech Elite
 
SaladFork's Avatar
R/C Tech Elite Subscriber
 
Join Date: Nov 2009
Location: Seattle
Posts: 3,349
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by [email protected] View Post
It should work just fine, there is no reason it wouldn't. It sounds like a sensor issue and it's not running smooth.
This has been a problem with this version of the SP motor and the RSP, I have tested two RSP's and a few other guys who have tested a different motor (same version) had the same problem. The motor I have works on the MMP so I know it's not the motor. Thanks for the help Ty.
__________________
TLR | AE | AKA | Viper |
SaladFork is offline   Reply With Quote
Old 06-04-2010, 09:29 PM   #43
Tech Regular
 
annonymous's Avatar
 
Join Date: Aug 2009
Location: TX
Posts: 498
Trader Rating: 21 (100%+)
Default

anyway, since this thread is about the new motor:

will it have adjustable timing like the 1/10 redline motors?

what is the default timing (as in "zero degrees" on a novak ballistic is actually 30 degrees) ?
__________________
I drive faster on the bench...

Orion - Futaba - Savox - RCAmerica
annonymous is offline   Reply With Quote
Old 06-05-2010, 09:48 PM   #44
Team Tekin
 
Randy_Pike's Avatar
 
Join Date: Nov 2007
Location: Norcal
Posts: 9,660
Trader Rating: 6 (100%+)
Send a message via Yahoo to Randy_Pike
Default

Quote:
Originally Posted by SaladFork View Post
This has been a problem with this version of the SP motor and the RSP, I have tested two RSP's and a few other guys who have tested a different motor (same version) had the same problem. The motor I have works on the MMP so I know it's not the motor. Thanks for the help Ty.
Your motor is most likely wires incorretly. The humming followed up by the motor then running sound like us going into sensorless mode. Try this: Disconnect the sensor harness right off the bat, does it run smoothly then?

Also a motor that runs hot very quickly often has a short, something to consider.

Can we get back on topic now? So who wants the new SCx4? LOL
__________________
"Things may come to those who wait, but only the things left by those who hustle." Abraham Lincoln

Tekin,Protek,A-Main Hobbies,JConcepts,Avid RC,Yokomo,MIP,SikLidz,FactoryRC, www.randypikerc.com
Randy_Pike is offline   Reply With Quote
Old 06-05-2010, 09:53 PM   #45
Tech Fanatic
 
Join Date: Jul 2007
Location: Arlington, TX
Posts: 956
Trader Rating: 32 (100%+)
Send a message via AIM to JDCrow Send a message via Skype™ to JDCrow
Default

Quote:
Originally Posted by Randy_Pike View Post

Can we get back on topic now? So who wants the new SCx4? LOL
If its what you had in your Truck at AMS this weekend .....you know how to reach me!!!!

Great job
JDCrow 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 03:45 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net