Product Documents
Just Cuz RevvitRC 50A AM32 ESC with BEC
JUST CUZ ROBOTICS AM32 ESC — RevvitRC 50A WITH BEC
The Just Cuz Robotics AM32 ESC that was built from the ground up for combat — not adapted, not flashed, purpose-built. The RevvitRC 50A delivers incredible responsiveness and low-end torque for sensorless brushless motors, with a switchable 7.4V/8.4V onboard BEC powerful enough to drive servos. It’s the natural match for JCR’s RDY hubmotor lineup and a serious upgrade for any bot that needs reliable high-current motor control.
$42.00
6 in stock (can be backordered)
Built for Combat from the Ground Up
Most AM32 ESCs started life as BlHeli32 designs and were flashed to AM32 later — the Just Cuz Robotics AM32 ESC is different. The RevvitRC 50A was developed for AM32 from the ground up, which means zero loss of functionality. Low voltage cutoff, current limits, thermal protection, and telemetry all work exactly as intended. No compromises, no missing features — just a clean, purpose-built combat ESC that does exactly what it says.
What It’s For
At 50A continuous on 3–6S, the RevvitRC is sized for serious work — 3lb weapon motors, 12lb drive systems, and anything else that demands high current and reliable response. It pairs perfectly with the JCR RDY-5735 950KV, RDY-5735 750KV, RDY-5536 900KV, RDY-5536 1200KV, and the RDY-5022 hubmotor lineup — sensorless brushless motors that demand exactly this kind of high-current, high-response ESC. It also works well as a drive ESC for larger bots. As always, verify your needs and design vs the specs of the ESC to make sure it’s a reasonable fit.
The Onboard BEC
The RevvitRC is the only brushless ESC in the Just ‘Cuz lineup with a built-in BEC capable of powering not just a receiver, but servos as well. The BEC output is switchable between 7.4V and 8.4V via an onboard DIP switch, with a 5A load rating — plenty for high-torque servos and accessories. This makes it particularly well suited for bots with active weapons or mechanisms that need servo power without a separate BEC.
⚠ BEC Warning — Read Before Wiring
Do not connect more than one BEC to your receiver. If you have multiple ESCs or BEC sources in your build, cut the red wire from all but one BEC voltage source to your receiver. Failure to do so can damage your receiver and electronics.
Verify your receiver’s voltage rating before connecting. The RevvitRC BEC outputs 7.4V or 8.4V — significantly higher than a standard 5V BEC. Not all receivers support these voltages. Check your receiver’s specifications carefully before powering up.
Default Configuration and Programming
Out of the box, the RevvitRC ships configured as a Brushless Weapon ESC — single direction, braking disabled. No programming required for most weapon applications; just wire it up and run. If you need to switch to drive mode, reverse direction, enable braking, or fine-tune any parameters, every RevvitRC ships with a USB-C programmer so you can adjust settings via the AM32 config tool. You can also use the Grey Skies ESC Programmer available at ItGresa. Note: the ESC must be connected to a battery for power when programming — the programmer does not power the ESC.
For a full explanation of all AM32 settings, see the AM32 firmware settings wiki. Before adjusting any parameters, Just ‘Cuz strongly recommends watching this setup video first.
⚠ Programming Caution
Do not arbitrarily adjust startup power or startup level settings. If these parameters are set too high, the ESC can burn out immediately on power-up. If you’re unsure, leave the defaults alone — they work well for most combat applications.
Wiring & Power Distribution
Need a clean way to wire your bot? The RevvitRC pairs seamlessly with Just ‘Cuz power distribution boards — the Switch PD Board, the Long All-in-One PD Board v2.1, or the Basic PD Board — all stocked at ItGresa. Each brings power switching and distribution into one clean solution, eliminating rats-nest wiring in tight chassis.
Additional Resources
- RevvitRC CAD mockup on GrabCAD — general size and shape reference for chassis design (also available in the Documents section)
- Manufacturer documentation — full product manual (also available in the Documents section)
- AM32 programming setup video — strongly recommended before adjusting any firmware settings
Features
- Purpose-built AM32 firmware: Developed for AM32 from the ground up — not flashed from BlHeli32, so every feature works as intended
- Just Cuz Robotics AM32 ESC at 50A continuous: Sized for 3lb weapon motors, 12lb drive systems, and high-demand sensorless brushless applications
- Onboard switchable BEC: 7.4V or 8.4V selectable via DIP switch, 5A load — powerful enough for servos, not just receivers
- Full protection suite: Low voltage cutoff, thermal protection, and current limiting all functional and adjustable
- Telemetry support: Real-time motor data available for tuning and diagnostics
- USB-C programmer included: Fine-tune settings for weapon, drive, or custom applications
- Works out of the box: Ships pre-configured as Brushless Weapon — no programming required for most combat applications
- Pairs perfectly with JCR hubmotors: Matched to the RDY hubmotor lineup for plug-and-play high-current performance
Specifications
| Specification | Value |
|---|---|
| Continuous Current | 50A |
| Voltage Range | 3–6S LiPo (11.1–22.2V) |
| BEC Output | 7.4V or 8.4V switchable (DIP switch), 5A |
| Firmware | AM32 (purpose-built, not flashed from BlHeli32) |
| Default Configuration | Brushless Weapon (single direction, braking disabled) |
| Motor Type | Sensorless brushless |
| Length (board only) | 1.18in (30mm) |
| Width (board only) | 0.67in (17mm) |
| Length (with capacitors) | 1.73in (44mm) |
| Width (with capacitors) | 0.71in (18mm) |
| Height (with capacitors) | 0.55in (14mm) |
| Weight | ~0.81oz (~23g) without motor wires |
| Included Programmer Interface | USB-C |
| Waterproof | No |
| Telemetry | Yes |
| Low Voltage Cutoff | Yes (adjustable) |
| Thermal Protection | Yes (adjustable) |
| Current Limiting | Yes (adjustable) |
What’s In The Box
| Item | Qty | Notes |
|---|---|---|
| RevvitRC 50A AM32 ESC | 1 | Pre-configured as Brushless Weapon |
| USB-C Programmer | 1 | For AM32 parameter adjustment and firmware flashing |
Frequently Asked Questions
What’s the default configuration out of the box?
The RevvitRC ships pre-configured as a Brushless Weapon ESC — single direction, braking disabled. Just ‘Cuz has optimized the default settings to pair well with their motor lineup, so for most weapon applications you can wire it up and run without touching the programmer. No setup required.
Can I use this as a drive ESC as well as a weapon ESC?
Yes — the RevvitRC works well as a drive ESC for larger bots. At 50A continuous on 3–6S it’s sized for serious drive applications. You’ll want to switch the configuration from Brushless Weapon to a drive-appropriate setting using the included USB-C programmer, including setting up reverse (bidirectional motion). As always, verify your motor and voltage requirements against the ESC specs before committing to a build.
My receiver isn’t responding after wiring — what should I check?
Two things to check immediately:
BEC voltage: The RevvitRC BEC outputs 7.4V or 8.4V — significantly higher than a standard 5V BEC. If your receiver isn’t rated for these voltages it may not respond, or worse, may be damaged. Check your receiver’s voltage rating before powering up.
Multiple BECs: If you have more than one BEC connected to your receiver, cut the red wire from all but one BEC source. Multiple BEC sources fighting each other is a common cause of receiver issues and can cause damage. If neither of these resolves it, center your transmitter throttle and power cycle — the ESC won’t initialize if throttle isn’t at neutral.
What programmer do I need to change settings?
Every RevvitRC ships with a USB-C programmer — it’s included in the box, so you’re ready to go. If you need a spare or a second programmer for your pit kit, ItGresa carries the Grey Skies ESC Programmer. Note that the ESC must be connected to a battery for power when programming — the programmer does not power the ESC.
Can I use this ESC on 2S?
Technically the ESC may function on 2S, but we spec it at 3–6S and that’s what we recommend. Here’s why: the onboard BEC requires at least 3S to regulate properly to 7.4V or 8.4V. If you’re running 2S you won’t have a functioning BEC anyway — and if you don’t need the BEC, you probably don’t need this ESC. It was designed for 3S and above, and that’s where it performs as intended.
What’s the difference between this and other AM32 ESCs?
Most AM32 ESCs on the market started life as BlHeli32 designs and were flashed to AM32 firmware later. That means some features — low voltage cutoff, current limiting, thermal protection, telemetry — may not work correctly because the hardware wasn’t designed for them. The RevvitRC was developed for AM32 from the ground up, so every feature works exactly as intended. It’s also the only brushless ESC in the Just ‘Cuz lineup with a built-in BEC capable of powering servos — a meaningful advantage for bots with active weapons or mechanisms.
What’s the advantage of programming my ESC vs just using the defaults?
Think of it like this: most drivers on the road do just fine in a stock car. A competitive weekend racer might tune the suspension and upgrade the tires. A NASCAR driver needs every possible edge — and has the skills and team to extract it. ESC programming works the same way.
For most combat robot builders — especially those still developing their driving skills, refining their bot design, or new to the sport — the default configuration works well and the industry ran on it for years. Where programming pays off is when you have a solid, proven robot, strong driving fundamentals, and you’re competing against the best. At that level, dialing in timing, braking response, and startup behavior can give you a real edge.
The honest truth? We’ve seen terrible robots win year after year on excellent driving and smart strategy. We’ve seen world-class machines lose on poor execution. If your driving isn’t there yet, if your robot still has reliability issues, or if you’re just getting started — focus there first. Putting a NASCAR engine in a daily driver doesn’t make you faster. Get the basics right, then tune.
