Like Tree25Likes

Drag brake

Reply

Old 05-09-2019, 08:09 PM
  #61  
Tech Regular
 
Join Date: Jul 2018
Location: Florida
Posts: 278
Default

If your brakes trigger quicker by going to neutral than going to throttle reverse you could get more heat but probably not much if any. The motor is designed for a trapezoidal wave form and if they are made correctly when the current exceeds the design intent it could be turned into heat in the motor but that assumes 100% of it could not be dumped back into the esc. Which it probably is or at least its extremely similar to the current that would be dumped by pulling the trigger minus the time it took if it triggered sooner in neutral. Possible but that is allot of ifs that live and die in the micro second world.
Bry195 is offline  
Reply With Quote
Old 05-09-2019, 10:56 PM
  #62  
Tech Elite
iTrader: (2)
 
gigaplex's Avatar
 
Join Date: Dec 2015
Location: Melbourne, VIC
Posts: 2,539
Trader Rating: 2 (100%+)
Default

Originally Posted by bertrandsv87 View Post
Nobody said that the current was not already fluctuating...Drag brake makes the current fluctuate more than without drag brake, hence the increased heat, etc,....
Too much Kool Aid buddy and my Jeep 4.0L is working just fine, better than the Can Am series.....lol.....
The current changes directions 3 times per revolution of the rotor. At 20,000RPM, that's ~1000 times per second. And the ESC typically operates the switching frequency at 1000 to 20,000Hz. I doubt 20 periods of drag braking per lap is going to even register in the frequency of current fluctuations.
gigaplex is offline  
Reply With Quote
Old 05-09-2019, 10:57 PM
  #63  
Tech Elite
iTrader: (2)
 
gigaplex's Avatar
 
Join Date: Dec 2015
Location: Melbourne, VIC
Posts: 2,539
Trader Rating: 2 (100%+)
Default

Originally Posted by Zerodefect View Post
I always pre-cool my motors a few degrees before a run by spraying them with Tag body spray.
I thought that was against the rules.
gigaplex is offline  
Reply With Quote
Old 05-10-2019, 05:26 AM
  #64  
Tech Regular
iTrader: (20)
 
dave-man's Avatar
 
Join Date: Jul 2010
Posts: 366
Trader Rating: 20 (100%+)
Default

Originally Posted by gigaplex View Post
I thought that was against the rules.
It might be..... but the pleasing aroma makes it justified.
sps3172, astgerma52sp and glennhl like this.
dave-man is offline  
Reply With Quote
Old 05-10-2019, 08:17 PM
  #65  
Tech Regular
 
Join Date: Jul 2018
Location: Florida
Posts: 278
Default

Higher switching frequencies into the motor does generate a little more heat in the motor. I dont know what happens in the motor when a higher switching frequency is used when power is coming out. Maybe a hotter esc?
Bry195 is offline  
Reply With Quote
Old 05-13-2019, 08:36 AM
  #66  
Tech Fanatic
iTrader: (12)
 
silden's Avatar
 
Join Date: Dec 2012
Location: Los Angeles
Posts: 885
Trader Rating: 12 (100%+)
Default

I read through the whole thread and realized that there is a new competition going on.
It is who got the coldest ESC and Motor after the race and not who’s the fastest.

Jokes aside Braking usually heats up the ESC and motor.
The drag brake should be set per layout and driving style.
silden is offline  
Reply With Quote
Old 05-18-2019, 03:25 PM
  #67  
Tech Rookie
 
Join Date: May 2018
Posts: 6
Default

Ok, so the threadmaker asked what dragbrake was.

It is applyed brake when throttle is set to zero.
If you ned the car to decrease its speed when just letting go the throttle, you increase dragbrake.

If you run a ”slow” class and a open track, leave it at zero, since you need momentum to keep the speed up.

If you run mod and have like ”sweepers” where you cant use full throttle but need it to slow down slightly, it is good to use dragbrake. If you have a party of curves, depending on how your car goes, you might accelerate in the mid to exit but letting it go in the corner entry, you might use the effect of dragbrake.

In mod we usually use the breaks alot, and set dragbrake to somewhere 10-12%. Its good when it goes a little to fast, especially when you are at sweepers where you balance the car between losing and gaining grip. It depends alot of the track/power/drivning style.
silden likes this.
GBGTias is offline  
Reply With Quote
Old 05-19-2019, 09:22 PM
  #68  
Tech Apprentice
iTrader: (4)
 
Tek97's Avatar
 
Join Date: Feb 2019
Posts: 56
Trader Rating: 4 (100%+)
Default

Originally Posted by GBGTias View Post
In mod we usually use the breaks alot, and set dragbrake to somewhere 10-12%.
Just a reminder to folks new to drag brake that percentage is relative to the ESC. 10% on a HW is not the same as 10% on another brand and so on.
Tek97 is offline  
Reply With Quote
Old Yesterday, 01:56 AM
  #69  
Tech Addict
iTrader: (11)
 
warnos's Avatar
 
Join Date: Nov 2009
Posts: 524
Trader Rating: 11 (100%+)
Default

Outdoor I used drag brake.. feels slower but the lap times are lower and more consistent.
warnos is offline  
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service