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Home RC Car and Truck Build Projects Project Scorpion: Budget Build Of The Axial AX10 – Part 2
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Project Scorpion: Budget Build Of The Axial AX10 – Part 2

Axial AX10 Scorpion Rock Crawler MotorToday we’re going to look at the electronics we chose for Project Scorpion. Like we stated in Part 1 the main purpose of this build was to evaluate what a very low budget Axial AX10 Scorpion could do. With that in mind I can guarantee that you won’t be seeing any high dollar brushless motors or Spektrum radio systems here. Instead we chose to go with a simple 2 channel AM radio system, and Integy lathe motor, and an LRP electronic speed control. After the jump you can read all the info on each one.

Part 2: Electronics
It’s funny how such a simple thing can make a big difference. Years ago when people needed a motor with torque for their r/c truck they had two choices, either a 27t stock motor, or a big buck pulling motor. The 27t motors were cheap but they just didn’t have enough torque for rock crawling. The pulling motors (ie. Astroflight Pullmaster) had a ton of power but were expensive and required an expensive ESC. Finally one day somebody had the bright idea to throw motor intended for a motor lathe in their truck and the rest is history. The lathe motor has truly changed the face of the r/c rock crawling world. Considering how cheap these things are we knew it was the perfect choice for Project Scorpion. Currently these motors are available from 35t all of the way up to 85t. We originally chose to go with the tried and true 55t but because they were on backorder we decided on the Integy 45t Pro Lathe Motor. ($19) This motor has really good torque and with the gearing in the Axial it’s pretty much unstoppable. I can’t even imagine what the 85t would be like. Integy 45 turn lathe motor
Integy 45t Lathe Motor

For the ESC we were again looking for something to meet a very low budget. During our search we found a few models that seemed to fit our purposes but then a search on a rock crawling forum pointed me to this one. What caught my eye with the LRP Runner Series ESCs is that they are totally waterproof! In the past I was forced to wrap my ESC in a ballon to keep moisture out but in doing so I took the chance that it may overheat due to a lack of airflow. With this ESC that is no longer a problem. Hopefully other ESC manufacturers will follow in LRP’s footsteps, we need more waterproof ESCs. The exact model we chose was the LRP Quantum Runner Reverse. ($40) It is only rated for 18+ turn motors but considering that this thing will only be used in a rock crawler I don’t see that ever being a problem. There are two drawbacks to this ESC however. First off the reverse delay. For fooling around on the rocks in my backyard it doesn’t bother me all that much, but to some it may be annoying at the least. Secondly the automatic setup. This ESC has a completely automatic setup. Just plug the battery in and go. The problem is that the ESC has the knack of sometimes reversing the throttle. This little annoyance is a known flaw with this ESC and really isn’t a big deal. If it does reverse your throttle all that is required to fix the problem is to disconnect the battery for a second.LRP Quantum Runner Reverse
Here is a size comparison of the Quantum Runner Reverse. I had no idea this thing was so small.LRP Quantum Runner Reverse Size Comparison

A close up picture of the ESC

LRP Quantum Runner Reverse Close Up
Here is what comes with the Quantum Runner Reverse. A bunch of decals, capacitors, and of course an owners manual. (not pictured) It is highly recommended you install the capacitors to your motor to reduce glitching.LRP Quantum Runner Reverse Items Included
Here is the ESC after we installed a set of Deans connectors.LRP Quantum Runner Reverse with Deans Connectors
The Quantum Runner Reverse includes a heatsink to fit over the FETs. However it is imperative that when you install the heatsink you use the tiny rubber grommet which is included. (arrow) Not only does this grommet keep the heatsink secured to the ESC but it also stops the heatsink from touching the FETs. If the heatsink or any other metal object were to touch any two FETs at one time it would result in the shorting out of the ESC.LRP Quantum Runner Reverse Heatsink
For the radio we chose a simple Futaba PH2 AM radio system. ($42) I’ve been using these things on R/C cars and trucks for years without a hiccup. It includes one servo. Futaba 2PH AM Radio System

Futaba 2PH Radio

Here is a size comparison showing how tiny the Futaba receiver is. I remember when these things were humongous!Futaba Receiver Size Comparison

Stay tuned for part three which includes the build of Project Scorpion!

Project Scorpion
Part 1 – It’s here!
Part 2 – The electronics
Part 3 – The build
Part 4 – Testing
Part 5 – Modifications
Part 6 – 1.9 Conversion

 

 
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6 Comments  comments 

6 Responses

  1. boone

    Hi,
    Did you install the capacitors for the Integy Motor? I have a 65 turn with some Trinity no solder leads.I am confused on where to put the capacitors?I thank you for your time.
    Boone

  2. You need three capacitors. You put one from the negative terminal to the case of the motor, one from the positive to the case of the motor, and finally one going from positive to negative.

    You can read a little more about that on this page:
    http://www.rcracingusa.net/soldering.htm

  3. Dewayne

    I was looking for a remote and a reciever for my axial ax10. I was wanting to get a four channel. I want to put a rear steer and a front dig setup on my crawler. This is my first build. Any suggestions to help me out? Thanks for the help

  4. Technically you could run it off a three channel radio by using the third channel for the dig and tying the rear steering to the front with a y harness. Otherwise if you want to independently control the rear steering you’ll need a four channel stick radio like this:
    http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXSNP1**

  5. Dewayne

    Thanks for the help. I tried to use the link that you provided, but it said the part number is no longer avaliable. Could you recomend another remote? I was also wanting to know if it makes a difference if I use an airplane remote and reciever, and what frequency should I use for the best performance? Thank you again for all of the help!!

  6. Its against FCC regulations to use an airplane radio on surface vehicles.

    As for the link something was wrong with the link above, try this instead. Futaba 4GWD

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