Go Back   RCCrawler Forums > RCCrawler General Tech > Electronics
Loading

Notices

Thread: Have tech questions? Will answer.

Reply
 
LinkBack Thread Tools Display Modes
Old 10-17-2020, 12:39 PM   #1861
I wanna be Dave
 
Join Date: Jun 2016
Location: Deep in the Everglades
Posts: 5,623
Default Re: Have tech questions? Will answer.

Start by following the instructions. Castle esc and Futaba the esc channel needs to be reversed.

Look at your LED on the esc. Yellow is neutral/ stopped, Red should be reverse direction and green should be forward. If not , reverse channel 2


Hang up and Drive
mikemcE is offline   Reply With Quote
Sponsored Links
Old 10-17-2020, 01:37 PM   #1862
Newbie
 
Join Date: Jun 2015
Location: Vallejo
Posts: 8
Default Re: Have tech questions? Will answer.

I reversed throttle, then had to reverse motor direction, works right!
Thank you for taking time to help me out. Soooo much to learn.
Dirt Diggler is offline   Reply With Quote
Old 10-17-2020, 01:41 PM   #1863
Newbie
 
Join Date: Jun 2015
Location: Vallejo
Posts: 8
Thumbs up Re: Have tech questions? Will answer.

Thanks for the input, got it corrected. Reversed throttle and then motor direction.
Dirt Diggler is offline   Reply With Quote
Old 11-24-2020, 08:54 PM   #1864
Rock Stacker
 
Join Date: Oct 2020
Location: San Jose
Posts: 85
Default Re: Have tech questions? Will answer.

How much torque do you get from a motor?


I did some math and it looks like not much, but I may have missed something?

KT=1/KV. So a 2850KV has .0035 Nm/A Torque (KT).
Max RPM is 31,635 on an 11.1V (3S) Lipo.

For the sake of argument lets say it pulls 40A.
So the total torque output would be 0.01404 Nm or 0.00143 Kg-m.

Which is pretty dang low.


The it's compounded by the transmission, transfer case and axles, but still even at 100:1 it's still super low.


What did I miss?
itr1275 is offline   Reply With Quote
Old 11-24-2020, 09:21 PM   #1865
RCC Addict
 
Join Date: Feb 2017
Location: My mothers basement
Posts: 1,869
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by itr1275 View Post
How much torque do you get from a motor?


I did some math and it looks like not much, but I may have missed something?

KT=1/KV. So a 2850KV has .0035 Nm/A Torque (KT).
Max RPM is 31,635 on an 11.1V (3S) Lipo.

For the sake of argument lets say it pulls 40A.
So the total torque output would be 0.01404 Nm or 0.00143 Kg-m.

Which is pretty dang low.


The it's compounded by the transmission, transfer case and axles, but still even at 100:1 it's still super low.


What did I miss?
I don't know what you missed, https://m.facebook.com/groups/161551...1703704152535/

Here is a some motors from a dyno showing their torque.

The torque is linear, and not constant.

__________________________
Handy gearing spreadsheet

Last edited by Voodoobrew; 11-24-2020 at 09:23 PM.
Voodoobrew is offline   Reply With Quote
Old 11-29-2020, 07:58 PM   #1866
Quarry Creeper
 
Join Date: May 2017
Location: Bellevue
Posts: 369
Default Re: Have tech questions? Will answer.

Put a V2 Snubnose 1800kv Revolver in one of my Gelande IIís with a Mamba X. For a reference I set setting as John did in his, low and slow programming video. Course it was a sensored BL in the video, so not sure if Iím even on the right track using those same settings. Anyway, Iím having cogging issues on start up. Not sure if itís just my poor trigger finger, or if it is simply programming on the Mamba X that can resolve it. Thought maybe it was due to how heavy the RC4WD rigs are, so I purchased the 540 size 1800kv Revolver. But same issue. Thoughts??
If it helps, hereís a quick rundown of my settings.

BEC voltage - 7.4v (Protek 370TBL)
Start Power - High
Max Power - 100%
Punch Control - 30%
Throttle Curve - Basically pulled horizontal 60, down to the 3rd vertical line. Kinda like shown in attached pic.



Sent from my iPhone using Tapatalk
Fishcharger is offline   Reply With Quote
Old 11-29-2020, 10:49 PM   #1867
Pebble Pounder
 
Join Date: Aug 2020
Posts: 116
Default Re: Have tech questions? Will answer.

Whatís your battery voltage and gearing? If youíve watched Holmes videos youíve probably seen the volt up gear down saying.


Sent from my iPhone using Tapatalk
austin-92 is offline   Reply With Quote
Old 11-30-2020, 03:18 AM   #1868
Quarry Creeper
 
Join Date: May 2017
Location: Bellevue
Posts: 369
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by austin-92 View Post
Whatís your battery voltage and gearing? If youíve watched Holmes videos youíve probably seen the volt up gear down saying.


Sent from my iPhone using Tapatalk

Ah yes, great thought. Using 3s on a 12T pinion. Stock pinion was 14T.


Sent from my iPhone using Tapatalk
Fishcharger is offline   Reply With Quote
Old 11-30-2020, 09:44 AM   #1869
Quarry Creeper
 
Join Date: Dec 2013
Location: The Garden State, North of I-80
Posts: 410
Default Re: Have tech questions? Will answer.

Nevermind! I just realized, a day later!!!, that I posted on the wrong thread. LOL!

Last edited by Kingmeow; 12-01-2020 at 03:34 PM.
Kingmeow is offline   Reply With Quote
Old 11-30-2020, 05:00 PM   #1870
Pebble Pounder
 
Join Date: Aug 2020
Posts: 116
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by Fishcharger View Post
Ah yes, great thought. Using 3s on a 12T pinion. Stock pinion was 14T.


Sent from my iPhone using Tapatalk

Have you tried starting it up with the throttle trim to rule out your trigger finger?


Sent from my iPhone using Tapatalk
austin-92 is offline   Reply With Quote
Old 11-30-2020, 05:47 PM   #1871
Quarry Creeper
 
Join Date: May 2017
Location: Bellevue
Posts: 369
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by austin-92 View Post
Have you tried starting it up with the throttle trim to rule out your trigger finger?


Sent from my iPhone using Tapatalk

I have not. But may need to clarify a bit. Thereís no cogging when starting on a flat surface with a steady smooth trigger pull. Itís when attempting to ascend an object that it starts cogging. Course not every time. Sometimes it performs perfectly. Iíve never used an external BEC with a Mamba X/Puller Pro set up. So assumed I wouldnít need with an outrunner as well. Is it possible an external BEC is what I should be looking to add?


Sent from my iPhone using Tapatalk
Fishcharger is offline   Reply With Quote
Old 12-01-2020, 12:05 AM   #1872
Pebble Pounder
 
Join Date: Aug 2020
Posts: 116
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by Fishcharger View Post
I have not. But may need to clarify a bit. Thereís no cogging when starting on a flat surface with a steady smooth trigger pull. Itís when attempting to ascend an object that it starts cogging. Course not every time. Sometimes it performs perfectly. Iíve never used an external BEC with a Mamba X/Puller Pro set up. So assumed I wouldnít need with an outrunner as well. Is it possible an external BEC is what I should be looking to add?


Sent from my iPhone using Tapatalk

It was my understanding that a BEC is for servos/accessories? I couldnít imagine that causing issues with the motor starting up.


Sent from my iPhone using Tapatalk
austin-92 is offline   Reply With Quote
Old 12-01-2020, 09:46 AM   #1873
Sketchiness abounds...
 
durok's Avatar
 
Join Date: Jun 2016
Location: Austin
Posts: 5,185
Default Re: Have tech questions? Will answer.

I have an extremely lardy (heavy with many metal upgrades) Bomber running a Mamba X/Revolver 1800kv v1 and have no cogging at all using the settings from am older video that JRH had...
durok is offline   Reply With Quote
Old 12-01-2020, 11:28 AM   #1874
Quarry Creeper
 
Join Date: May 2017
Location: Bellevue
Posts: 369
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by durok View Post
I have an extremely lardy (heavy with many metal upgrades) Bomber running a Mamba X/Revolver 1800kv v1 and have no cogging at all using the settings from am older video that JRH had...

Sweet!! Thanks man good to know. I can take the MX/Revolver set out of the equation. Now to figure out the next thing to start looking at. Any thoughts?


Sent from my iPhone using Tapatalk
Fishcharger is offline   Reply With Quote
Old 12-01-2020, 12:44 PM   #1875
I wanna be Dave
 
Join Date: Jun 2016
Location: Deep in the Everglades
Posts: 5,623
Default Re: Have tech questions? Will answer.

I think your curve is wrong. Durock refers to the old TRX4 video setup. I run that same curve with both PullerProís and revolvers. Silky smooth low end on all. First off, calibration Tx/Rx, to the esc. Sec d make sure you have the last firmware from Castle.
Bump up the curve a bit in the beginning.


Hang up and Drive
mikemcE is offline   Reply With Quote
Old 12-01-2020, 11:06 PM   #1876
RCC Addict
 
Join Date: Feb 2017
Location: My mothers basement
Posts: 1,869
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by Fishcharger View Post
Sweet!! Thanks man good to know. I can take the MX/Revolver set out of the equation. Now to figure out the next thing to start looking at. Any thoughts?


Sent from my iPhone using Tapatalk
That's not how it works...

but sounds like your having sync issues, that's why sensor less motors cog. can happen when the motors turns slower then expected due to increased resistance, like climbing. I would suggest dropping the pinion more, this will decrease the resistance.

also Holmes has often suggested playing with the torque limit in the esc programming. I have no idea why it would help but worth a shot.
Voodoobrew is offline   Reply With Quote
Old 12-02-2020, 09:54 AM   #1877
Rock Crawler
 
Join Date: Apr 2020
Location: Northern MN
Posts: 579
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by durok View Post
I have an extremely lardy (heavy with many metal upgrades) Bomber running a Mamba X/Revolver 1800kv v1 and have no cogging at all using the settings from am older video that JRH had...

I set up my mamba x verbatim to that earlier video also. Have no issues as well with PP2700 and Revolver 2500.
Benp is offline   Reply With Quote
Old 12-04-2020, 06:21 AM   #1878
Quarry Creeper
 
Join Date: Jun 2013
Location: Twin Lake
Posts: 301
Default Re: Have tech questions? Will answer.

Make sure your timing is set to 0į for a revolver motor. I have noticed that you get smother starts with higher drag brake setting.
Druxus is offline   Reply With Quote
Old 12-06-2020, 02:04 PM   #1879
Quarry Creeper
 
Join Date: Feb 2018
Location: East otis
Posts: 312
Default Re: Have tech questions? Will answer.

Anyone having issues with castle's b link not working on android since the October update? It won't show any esc on the link controller page, yet in my phones blue tooth I can see the b link. I've emailed them twice, no response.

Sent from my SM-G970U using Tapatalk
Steve g is offline   Reply With Quote
Old 12-07-2020, 08:55 PM   #1880
RCC Addict
 
Join Date: Feb 2017
Location: My mothers basement
Posts: 1,869
Default Re: Have tech questions? Will answer.

Quote:
Originally Posted by Steve g View Post
Anyone having issues with castle's b link not working on android since the October update? It won't show any esc on the link controller page, yet in my phones blue tooth I can see the b link. I've emailed them twice, no response.

Sent from my SM-G970U using Tapatalk
I can only reply so you know some one heard you, unfortunately I do not have a b-link. I would delete the app data, then uninstall the app and reinstall it.
Voodoobrew is offline   Reply With Quote
Reply



Have tech questions? Will answer. - Similar Threads
Thread Thread Starter Forum Replies Last Post
suspension tech questions. Gen3_Teg_88 General Crawlers 9 07-13-2018 08:29 AM
axle tech questions 808eng_rc Multi Axle Rigs 4 11-07-2013 02:08 PM
(HH) Tech Questions and Customer support thread JohnRobHolmes Holmes Hobbies 3483 02-05-2013 09:08 PM
2 stupid newbie questions needs answer Mysterious Axial XR10 21 06-18-2012 09:22 AM
? Who has the answer to thes questions ? mik236 Team Losi Comp Crawler 12 05-23-2010 02:40 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 08:15 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com