

Hi all, 
I’m a novice, so please excuse any dummy-speak or silly solutions thatve gotten me thus far.  

So I got this silly idea to make a giant RC car using a stripped down power wheels and 24V mower…


The goal; a really fast, really big RC car out of freely available/really cheap components.  
The build approach: 
- gutted and reworked power wheels chasis
- Motor and battery from gutted 24v lawn mower (worx)
- Standard RC transmitter & receiver 
- eBay esc
- Steering TBD
The first goal was motion, will move to steering once that’s stable.

Step 1: control motor with RC.  [Check](https://imgur.com/gallery/motion-control-ArjTlxg)

Step 2: straight axle, design and 3d print axel bearing blocks, wheel splines and pulleys for the shortest belt I could find at autozone

Step3: mount motor, tension belt.

Step 4: testing.  That’s where it all came loose…
 Set aside the breakage in my 3d prints.  I propped the power wheel up to avoid any runaways.  I let er rip.  Fast, smooth, no problem; in a boneheaded move, [ I jerked the throttle in reverse.](https://imgur.com/gallery/wasn-t-ready-reverse-2qHtIil)

*  fizzle sound
*  Small fire
* Pulls out phone and records the 2nd video above



I’m assuming the momentum backed power whilst esc output was pushing opposite polarity?

How do I avoid back feeding power?  Obviously I need to ability to stop; so what do I buy?  (Not sure on W or Amps, pictures battery is 1 of 2 wired for 24v)

Bonus points; Does anyone have ideas on a responsive servo for something this big?




24v RC back-fed my esc?