Scorpion CL ESC


The Scorpion CL is a small low-cost high-performance dual channel H-bridge BRUSHED speed controller for beetleweight combat robots and other electrical loads. It is can also be used for antweight combat robots, R2D2 replicas, sumo robots, and other small robots such as firefighting robots, maze solvers, and carpet rovers. The Scorpion Mini is also suitable to drive pneumatic valves, solenoids, relays, and thermoelectric coolers.

If you are new to this, key things to note:

  1. Use this with brushed motors like this one: NOT brushless motors like this one: You can’t even plug them in, the wiring is fundamentally incompatible. (Brushed has two wires, brushless has three)

  2. A normal weapon ESC won’t work with brushless, because they have to be set up to use reverse. Otherwise, your bot will only go forward. If you are going to go the brushless route, this is not the ESC you are looking for. Use this one: Right now, that’s the only ESC we carry that has BRUSHLESS reverse capability for beetleweights. The Scorpion CL has full reverse for BRUSHED.

  3. The Scorpion CL has on-board mixing built in. If you are using a mixed signal, the on-board mixing will cancel that out and your bot will look like it is unmixed. Easy way to tell? if moving the stick to a diagonal corner (upper right or lower left) causes your bot to go straight forward and straight back, the odds are your signal is coming through unmixed.

Scorpion Mini vs Scorpion CL:

Parameter: Mini CL
Amp (cont): 6.5A ea 15A ea
Amp (peak): 8A 35A ea
Configurable: Jumpers DIP Switch

Scorpion CL on-board:

The Scorpion CL ESC has a number of useful features:

Scorpion CL ESC (Electronic Speed Controller) Diagram

Looking for an alternative to the Endbots DESC? The Scorpion CL is for you! Competitively priced with a great feature set.

The Scorpion CL is designed to pack the highest power handling capability, flexibility, control, and usability options into the smallest package.


13 in stock (can be backordered)

SKU: rp-scorpion-cl Categories: , , , Tags: , , ,


The Scorpion CL is designed to pack the highest power handling capability, flexibility of control and usability options into a small flat package for use in space-constrained applications. The Scorpion CL is designed without screw terminals or other bulky connectors for the battery and motor wires. Instead, solder pads are provided for factory soldered or user-installed wires. This allows maximum flexibility for power connections and keeps the Scorpion CL as small, lightweight, and flat as possible without reducing power handling.

Scorpion CL:

  • Size: 2.00″ x 1.30″ x .4″ (51mm x 31mm x 10.4mm)
  • Weight: 17.0 grams.
  • 6.0V to 28V (1S to 5S LiPoly) battery voltage.
  • 15A continuous (35A peak) current on each channel.
  • 6.5A continuous (8A peak) current on each channel.
  • 1.5A – 5V receiver battery eliminator circuit (BEC) – may be disabled by disconnecting center wire in RC cables.
  • Standard R/C pulse format
  • Fully reversible H-bridge design. Equal power handling in both directions on both channels.
  • Full current limiting and over temp limiting. This thing is nearly blow proof! Motors and batteries are protected from dead short conditions.
  • Two channels may be either mixed (throttle/steering) or separately controlled. Ideal for skid steer vehicles/robots.
  • An optional third RC channel controls a FLIP throttle reverse function. Activating when the robot is inverted will allow normal driving response – handy in combat situations. This input can also be activated by a gravity (Mercury) logic-level switch
  • Indicator LED for speed and direction of motor on each channel.
  • Status LED status information and mode indications.
  • Failsafe shuts off motors if R/C signal is lost.
  • Calibrate function to match unit to radio signal range. Settings retained in EEPROM non-volatile storage.
  • DIP switch to select operating options. Easily switch while running to test various options quickly and easily..
  • Channel Mix or Separate control (tank) mode.
  • Brake or coast on zero speed. Changes how quickly motor stops.
  • Normal (linear) steering response or Exponential curve which has lower response close to zero for less “twitchy” steering respose.
  • High or Low frequency motor frequency. High frequency produces no audible sound from the motors at a cost of slightly lower power handling. Low frequency will make the motors “sing” at about 8kHz frequency but allows maximum power.

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