Building 6WD / 6WS truck, Need advice

Talk about your custom made one-of-a-kind builds, and also off-beat R/C stuff that you just don't see everyday.
JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »

I'm fixin' to build a 6WD/6WS Clod. I got the chassis, and I got 3 beefy axles by Integy, with locked diffs. I will be plowing snow with this!

Each axle has a steering servo on it. Can I run all 3 steering-servos on one channel, using two Y-harnesses?

Also, each axle will have a brushed 80T 540 motor. I really want to power this thing with a a small sized (but heavy!) 12-volt Sealed Lead Acid Battery. What must I do in the ESC area to make this work? I really want to run 3 motors off of one ESC...

Thanks!

User avatar
matt1ptkn
Approved Member
Posts: 161
Joined: Tue Jan 24, 2017 3:13 pm
Location: Moundsville, WV

Re: Building 6WD / 6WS truck, Need advice

Post by matt1ptkn »

I'm sure that there are better answers, but my first thought for the ESC is a Traxxas EVX-2. They are rated to 16.8 volts and run two motors already. I figure a 3rd motor shouldn't be much more demanding. As for the servos, I'm not sure on the dual Y-harnesses, but its worth a shot. I think you'll either need a voltage booster, or a receiver pack to keep enough power to the servos, though. Good luck with the build and post some photos!
-Matt

My Trucks

"I wish there was a way to tell you're in the good old days, before you've actually left them."

JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Re: Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »

Thanks. I Just checked with QuicRun, which is the ESC I have now, and they said it will work on SLA battery at 12 volts, with three motors, as long as I don't go over a 60A load. I think three 540s will be fine in that area.

User avatar
weeb_beano
Regular Member
Posts: 253
Joined: Tue Feb 17, 2004 11:23 pm
Location: NYC

Re: Building 6WD / 6WS truck, Need advice

Post by weeb_beano »

Hi there,
I propose a different path if you're up for it - parallelizing the connections to each motor on axle to its own speed control.
You can do this by building your own Y-harness for 3,4, or X number of connections as needed.
Just be sure to remove the RED cable from all but one of your ESCs so that the battery eliminator circuitry is not competing with each other.
Each motor gets its own battery, and you can really scale out pretty hard as needed. Imagine three brushless ESCs driving one brushless motor each. By scaling out with parallelizing the circuits it is possible.

As for the steering, you can do this as well. Build your own Y-harness- just look for futaba compatible J connectors and receptacles on ebay or amazon as needed. It is a lot cheaper to purchase them in bulk and crimp out your own sets.
For the Clod, just make sure that one of your servos is setup to rotate in a natural reverse direction, otherwise you will have to flip over one of the servo connections by 180 degrees. In my case, Futaba and Hitec servos just happen to rotate in reverse directions by default. You only need one servo to spin this way for front steering.

I also like to pack my weight towards the space between the mid and rear axles for better performance. This even works out okay when the truck is pulling a load.

I am actually writing a book about radio controlled cars and trucks in general. Here is a diagram that I whipped up detailing one of my 6WD conversions showing the wiring diagram:
Image

Weight all the way in the back:
Image

Hope this helps!

JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Re: Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »

Almost done with the truck. Still waiting for some RC4WD 12mm Hex hubs to attach center wheels to axle. Anyway... I'm running three 540 80-turn motors on one channel. And also I'm running 3 steering servos on one channel (with one servo moving in reverse direction :) )

Battery is 12-volt NiMH with 10,000 mAh.
DSCN4031.jpeg
You do not have the required permissions to view the files attached to this post.

JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Re: Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »

I doubled-up the links. Middle set of wheels will be installed tomorrow!

But I have a worry: this truck is SUPER HEAVY. Probably over 25-pounds! With the axles locked, I'm afraid I might start breaking stuff.

So, I'm thinking I need to switch to open axles. Is there some place I can get metal gears for this, but with open differentials? The only metal gears I can find are for locked axles.
You do not have the required permissions to view the files attached to this post.

User avatar
Steve C
Approved Member
Posts: 1036
Joined: Tue Feb 17, 2004 11:10 pm
Location: michigan

Re: Building 6WD / 6WS truck, Need advice

Post by Steve C »

Only metal gears for clod axles you can get these days are the two larger counter gears. They are made by hot racing and can grab them off ebay. I replaced mine with those in my brushless King sling and so far so good.
I hear the train a comin'; it's rollin' 'round the bend, And I ain't seen the sunshine since I don't know when.
I'm stuck at Folsom Prison and time keeps draggin' on.

JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Re: Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »

weeb_beano wrote:
Wed Nov 06, 2019 2:43 am
Hi there,
I propose a different path if you're up for it - parallelizing the connections to each motor on axle to its own speed control.
You can do this by building your own Y-harness for 3,4, or X number of connections as needed.
Just be sure to remove the RED cable from all but one of your ESCs so that the battery eliminator circuitry is not competing with each other.
Each motor gets its own battery, and you can really scale out pretty hard as needed. Imagine three brushless ESCs driving one brushless motor each. By scaling out with parallelizing the circuits it is possible.

As for the steering, you can do this as well. Build your own Y-harness- just look for futaba compatible J connectors and receptacles on ebay or amazon as needed. It is a lot cheaper to purchase them in bulk and crimp out your own sets.
For the Clod, just make sure that one of your servos is setup to rotate in a natural reverse direction, otherwise you will have to flip over one of the servo connections by 180 degrees. In my case, Futaba and Hitec servos just happen to rotate in reverse directions by default. You only need one servo to spin this way for front steering.

I also like to pack my weight towards the space between the mid and rear axles for better performance. This even works out okay when the truck is pulling a load.

I am actually writing a book about radio controlled cars and trucks in general. Here is a diagram that I whipped up detailing one of my 6WD conversions showing the wiring diagram:
Image

Weight all the way in the back:
Image

Hope this helps!
Today I ran the truck for the first time. I have a brand new Tenergy 12-Volt NiMH battery, with 10,000 mAh, fully charged. Motors are RC4WD 540 with 80 Turns. I have these 3 motors harnessed into one ESC, the QuicRun 880 by HobbyWing. The truck runs good, but only for about 5 to 10 seconds. Then the ESC cuts the power and then shuts off the motors. The ESC does not feel warm at all, so I'm not sure what is going on. I reckon I have a problem. I studied your schematic picture, but it's a bit too complicated for me. I heard once you had 3 ESCs slaved to one channel. Maybe I should do that? If so, how?

This truck is very heavy now, probably close to 30lbs! So I imagine there's lots of load on everything. When I plow snow, the load will get higher. The axles are locked and I have steering servos on each axle. One good thing is the steering is GREAT!

JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Re: Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »

weeb_beano wrote:
Wed Nov 06, 2019 2:43 am
Hi there,
I propose a different path if you're up for it - parallelizing the connections to each motor on axle to its own speed control.
You can do this by building your own Y-harness for 3,4, or X number of connections as needed.
Just be sure to remove the RED cable from all but one of your ESCs so that the battery eliminator circuitry is not competing with each other.
Each motor gets its own battery, and you can really scale out pretty hard as needed. Imagine three brushless ESCs driving one brushless motor each. By scaling out with parallelizing the circuits it is possible.

As for the steering, you can do this as well. Build your own Y-harness- just look for futaba compatible J connectors and receptacles on ebay or amazon as needed. It is a lot cheaper to purchase them in bulk and crimp out your own sets.
For the Clod, just make sure that one of your servos is setup to rotate in a natural reverse direction, otherwise you will have to flip over one of the servo connections by 180 degrees. In my case, Futaba and Hitec servos just happen to rotate in reverse directions by default. You only need one servo to spin this way for front steering.

I also like to pack my weight towards the space between the mid and rear axles for better performance. This even works out okay when the truck is pulling a load.

I am actually writing a book about radio controlled cars and trucks in general. Here is a diagram that I whipped up detailing one of my 6WD conversions showing the wiring diagram:
Image

Weight all the way in the back:
Image

Hope this helps!
Is there a way to run the 3 ESCS on one battery? I have this really nice & expensive 12-volt NiMH battery with 10,000 mah that I got from Tenergy that I would like to use . Also, what ESCs are you using? I want to run 3 ESCs on one battery and on one channel.

User avatar
matt1ptkn
Approved Member
Posts: 161
Joined: Tue Jan 24, 2017 3:13 pm
Location: Moundsville, WV

Re: Building 6WD / 6WS truck, Need advice

Post by matt1ptkn »

My initial guess is that the three motors are simply pulling too much current for the single ESC to handle, and that is causing it to shutdown, similar to how a lipo low voltage cutoff does. Maybe, try removing one motor from the truck and driving it, just to test it out.
I can't think of any reason that three ESCs couldn't be run off the single battery, you would just need to make up a harnass.
-Matt

My Trucks

"I wish there was a way to tell you're in the good old days, before you've actually left them."

JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Re: Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »

I switched to a beefy Team Tekin ESC... and it works!

I'm also going to unlock the diffs.

emory70
Regular Member
Posts: 21
Joined: Wed Dec 30, 2009 12:16 am

Re: Building 6WD / 6WS truck, Need advice

Post by emory70 »

With all that weight, you may need more power to your servos. Holmes Hobbies has servos that have a second connector. That connector is for sending them power directly from a battery. Might be something worth looking into

JasonDog3
Regular Member
Posts: 42
Joined: Sat Feb 17, 2018 6:36 pm

Re: Building 6WD / 6WS truck, Need advice

Post by JasonDog3 »