Go Back   RCCrawler Forums > RCCrawler General Tech > Newbie General
Loading

Notices

Thread: 20kg vs 25kg servos

Reply
 
LinkBack Thread Tools Display Modes
Old 09-12-2019, 11:52 AM   #1
Newbie
 
Join Date: Sep 2019
Location: Canada
Posts: 46
Default 20kg vs 25kg servos

Looking at either a 20kg or 25kg servo for a TRX4 kit. As most of my rides will be on trails, would a 25kg servo be overkill? Either way I would probably have to ditch the Traxxas XL5 HV ESC looking at other posts on this matter. Would an alternative be to just add a BEC to XL5?
redpeppers is offline   Reply With Quote
Sponsored Links
Old 09-12-2019, 11:58 AM   #2
Rock Crawler
 
Join Date: Mar 2019
Location: Terrassa/Barcelona
Posts: 884
Default Re: 20kg vs 25kg servos

There is nothing like "overkill" but the ratings on servos....specially on aliex or fleabay...are doubtful. I would go with the stronger ...just in case ...and an UBEC
themountain is online now   Reply With Quote
Old 09-12-2019, 01:28 PM   #3
I wanna be Dave
 
Join Date: Jun 2016
Location: Deep in the Everglades
Posts: 5,773
Default Re: 20kg vs 25kg servos

400 in oz is what most will tell you the crawling benchmark is.

I like the high voltage servos, 7.4 to 8.4v , you can slow down and take a bit out by lowering voltage.
mikemcE is offline   Reply With Quote
Old 09-13-2019, 10:59 AM   #4
Quarry Creeper
 
Join Date: Nov 2018
Location: Oakley
Posts: 479
Default 20kg vs 25kg servos

My 20 kg china servo(ds321 has held up well in my trx4 sport. It generally seems to have enough torque to move the tires in most any situation but could use a tad more.

I do have the 25 kg version(ds3225) but hasnt seen time in the trx4.

I also had one of these in my trx4 at one point:



I killed it in one or two drives. A second one has survived in my rock rey but believe that is only because of the servo saver and flimsy steering turnbuckles that flex.

Last edited by mass-hole; 09-13-2019 at 11:02 AM.
mass-hole is offline   Reply With Quote
Old 09-13-2019, 12:50 PM   #5
Tiny Truck Hoarder
 
HumboldtEF's Avatar
 
Join Date: Jun 2017
Location: Humboldt county
Posts: 4,294
Default Re: 20kg vs 25kg servos

As the saying goes (or maybe its lyric/song) Too much is not enough. I always want more. But if you're just doing light trailing that might not be the case.

I would upgrade to an external BEC before swapping ESC's, the internal BECs typically aren't that great compared to the external type. I think the Mamba X is one of the few ESCs that has an internal BEC thats regarded as good enough to use on power hungry servos.

Last edited by HumboldtEF; 09-13-2019 at 12:55 PM.
HumboldtEF is offline   Reply With Quote
Old 09-13-2019, 01:52 PM   #6
I wanna be Dave
 
Join Date: Aug 2016
Location: Orange County, CA
Posts: 3,555
Default Re: 20kg vs 25kg servos

Quote:
Originally Posted by mass-hole View Post
My 20 kg china servo(ds321 has held up well in my trx4 sport. It generally seems to have enough torque to move the tires in most any situation but could use a tad more.

I do have the 25 kg version(ds3225) but hasnt seen time in the trx4.

I also had one of these in my trx4 at one point:



I killed it in one or two drives. A second one has survived in my rock rey but believe that is only because of the servo saver and flimsy steering turnbuckles that flex.
Saved me from trying out those SPT servos!
soze is offline   Reply With Quote
Old 09-13-2019, 03:16 PM   #7
Quarry Creeper
 
Join Date: Nov 2018
Location: Oakley
Posts: 479
Default Re: 20kg vs 25kg servos

Quote:
Originally Posted by soze View Post
Saved me from trying out those SPT servos!


There was another guy in the trx4 section that had the same thing happen. I didnt see his post until after i bought them. One of the gears strips and it just freewheels.
mass-hole is offline   Reply With Quote
Old 10-01-2019, 08:47 AM   #8
Newbie
 
Join Date: Dec 2017
Location: US
Posts: 32
Default Re: 20kg vs 25kg servos

I have a 25kg servo in my TRX4 with a mamba x with the internal BEC set to 6.0volts to save the other micro servos. My problem is that while under throttle to servo seems to lose power and will barely steer. I have tried two different model 25kg servos with the same results. I do have an external BEC but was hoping the mamba x wouldnt need it and it would help keep the wiring clean without it. Any ideas?
smack2006 is offline   Reply With Quote
Old 10-02-2019, 09:06 PM   #9
Newbie
 
Join Date: Dec 2017
Location: US
Posts: 32
Default Re: 20kg vs 25kg servos

I added a BEC and solved my problem. It seems these servos are wanting more than 6.0v and are capable of up to 6.8v. I set my BEC to 6.7v and it works great and seems to have plenty of power now even under throttle.


Sent from my iPhone using Tapatalk
smack2006 is offline   Reply With Quote
Old 10-02-2019, 09:33 PM   #10
I wanna be Dave
 
Join Date: Sep 2019
Location: US
Posts: 2,303
Default Re: 20kg vs 25kg servos

Sounds similar to the "debate" I'm having. I'm building the new Axial Capra, and, no sooner had I thought I'd decided my ESC & motor, another 'urveball' came my way. I had finally settled on the Mamba X & Slate "Crawler Combo"...but, then I started wondering if the electronics tray had a large enough spot for the Mamba X. Thus, I started thinking about the Mamba Micro X, which is considerably smaller.

Now, I've gotten my brain into a "pickle". I'll measure the tray tomorrow morning. If it's too small for the Mamba X, then I'll have to go with the "micro"...but, I'll also need an external BEC. However, if the tray does prove large enough to hold the X, that's where the "pickle" begins.

The Capra is kinda like "baby bear" - it's not meant to be a hardcore crawler like "Papa Bear", but it's also not meant to be a rock racing vehicle like "Mama Bear", it's the just-right "baby bear". At the same time, with electronics, it will be closer to 5lbs (1lb above the "rock racing" capability of the micro). Starting to see the dilemma? Anyone have "words of wisdom? While I know off-road race vehicles (buggies, SCTs, STs), I'm a newb where crawlers are concerned.

~ More peace, love, laughter, & kindness would make the world a MUCH better place
Panther6834 is offline   Reply With Quote
Old 10-04-2019, 07:20 AM   #11
Newbie
 
Join Date: Dec 2017
Location: US
Posts: 32
Default Re: 20kg vs 25kg servos

I spoke to soon. After more testing Iím still seeing the servo lose power when on throttle even with a BEC.


Sent from my iPhone using Tapatalk
smack2006 is offline   Reply With Quote
Old 10-04-2019, 10:55 AM   #12
I wanna be Dave
 
Join Date: Jan 2006
Location: Corruptifornia
Posts: 12,038
Default Re: 20kg vs 25kg servos

Quote:
Originally Posted by redpeppers View Post
Looking at either a 20kg or 25kg servo for a TRX4 kit. As most of my rides will be on trails, would a 25kg servo be overkill? Either way I would probably have to ditch the Traxxas XL5 HV ESC looking at other posts on this matter. Would an alternative be to just add a BEC to XL5?
IME dsn't waste your money on the cheap servos, got one in my TF2 and it's barely adequate even in that and the gears developed slop after only two outings.

Quote:
Originally Posted by themountain View Post
There is nothing like "overkill" but the ratings on servos....specially on aliex or fleabay...are doubtful. I would go with the stronger ...just in case ...and an UBEC
Yep.

Quote:
Originally Posted by mikemcE View Post
400 in oz is what most will tell you the crawling benchmark is.

I like the high voltage servos, 7.4 to 8.4v , you can slow down and take a bit out by lowering voltage.


Quote:
Originally Posted by HumboldtEF View Post
As the saying goes (or maybe its lyric/song) Too much is not enough. I always want more. But if you're just doing light trailing that might not be the case.

I would upgrade to an external BEC before swapping ESC's, the internal BECs typically aren't that great compared to the external type. I think the Mamba X is one of the few ESCs that has an internal BEC thats regarded as good enough to use on power hungry servos.
X1000
Natedog is offline   Reply With Quote
Reply

Tags
25kg, trx4, xl5



20kg vs 25kg servos - Similar Threads
Thread Thread Starter Forum Replies Last Post
AX10 Deadbolt doesn't like the 20kg PowerHD servo? TK4ever Newbie General 19 12-12-2018 02:09 PM
Power HD 2 pack 20kg on eBay cjcanfield Electronics 2 10-13-2018 06:57 AM
Fan model FS-20W 20kg servo unboxingish Ditchrat Electronics 2 06-27-2018 01:48 PM
Thread Tools
Display Modes

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 On



All times are GMT -6. The time now is 04:20 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com