pre order

Inertia Motor Dyno (Hobby Grade)

Availability: Pre-order
Motor Holder:
Voltage and Current Sensor:

Guaranteed safe Checkout

This is a universal (hobby grade) benchtop inertia motor dynamometer (dyno) that measures the rpm, Kv (rpm/voltage), voltage, current draw, power and torque output of a electric motor. This dyno is great tool for motor analysis, ESC (boost) adjustment, brushless sensor adjustment, gearing calculation, etc. The dyno is coupled to a motor holder via a pulley and belt to accelerate the inertial mass. We will call this a ‘flywheel’ for simplicity. Our data acquisition electronic board takes the flywheel’s inertia (resistance of an object to a change in its state of motion), measures the rate it takes to accelerate and calculates the output power and torque of the tested motor. Our dyno repeatedly measures and calculates power in small increments to produce an accurate graph on a PC of the engine’s power characteristics.

Precise, otherwise known as "Repeatability"  is what you want in a dyno, that means test the same electric motor time after time and get the same results. Our dyno is capable of repeatable test results using the ESC/Throttle Controller Board (Sold Separately). 

The dyno uses a high speed data adquisition board with a build Optical RPM sensor, delivering low noise and accurate readings. It features a built-in micro USB for connection to your PC. It includes one external LCD port, one external I.R Temp port, one current and voltage sensor port, and two temperature sensor ports.


The dyno uses a high quality 6061 aluminum frame cover around the flywheel to protect from high rpm speeds produced by your motors. Yet we still offer the ability to see the flywheel spinning action by adding a clear window screen. In addition, a clear Plexiglas shield covers the belt to protect from possible belt breakage.

Aluminum flywheel Cover with belt shield protection.


The dyno uses the engine to simply accelerate a flywheel (variable load). We calculate the mechanical power and mechanical torque of the motor by knowing the flywheels inertia (resistance of an object to a change in its state of motion) and it's acceleration. We offer different sizes and materials to best suit your motor application. Additional flywheels can be purchased separately.



Screw into baseboard to securely fasten the dyno. Screw #3 is optional. 




We offer different size of motor holders to test in the dyno. For more information in the dimensions, please check the drawing section.  



A pulley is installed in the test motor to includes two size of pulleys: 3.175mm, and 5mm bore to use with Outrunner and 540/550 sized motors. Additional size pulleys can be purchase separately.



The flywheel incorporates a set of 2 high-speed, black-sealed, steel ball-bearings throughout the assembly to ensure low friction and maximum efficiency. Optional ceramic bearings can be purchased separately. 


  • (1) Hobby motor inertia dyno with customer's selected flywheel
  • (1) Voltage and current sensor based on customer's selection
  • (1) Motor mount based on customer's selection
  • (1) Pulley for 3.175mm motor shaft
  • (1) Pulley for 5mm motor shaft
  • (1) Micro-B USB cable
  • (1) Software license key (software updates are sold separately)


  • Allen: 1.5mm, 2.0mm
  • Phillips Screw Driver
  • Soldering Iron


  • Test Motor
    (Based on your selected motor mount)
  • Electronic speed controller (ESC)
  • Battery to power ESC and motor (MIN 3.7V for A1 Sensor / 5V for H1 sensor).
  • ESC Controller 
    (Not Required if using ESC/Throttle Controller Sensor)
  • Windows PC with 1 USB Port
    (Two USB ports are required when using the ESC/Throttle Controller Sensor)



Specs.  MinimumMaximumAccuracy                            
Angular Speed*480 r/min 30,000 r/min8%
Mechanical Torque*

0.25 N·m

(GT2-2P Pulley)

0.5 N·m

(GT2-3P Pulley)

Mechanical Power*Dependent on flywheel selection8%
Data Sampling5hz50hz-

* Accuracy reading at 10hz frequency.


flywheel kinetic energy graph
Flywheel SelectionRotational Kinetic Energy
in 1 sec 
90D-3t Aluminum      65.5 W
90D-11t Aluminum240 W
124D-11t Aluminum876 W
100D-11t Steel1,042 W
124D-11t Steel2,470 W


Port #1LCD screen5hz operating frequency required
Port #2IR. temp. sensor 
Port #3Voltage and current sensor 
Port #4Thermistor temp. Sensor #1 
Port #5Thermistor temp. sensor #2 




  • Radio Control Vehicles:
    • R/C Cars
    • R/C Airplanes
    • R/C Drones
  • Reduction gear, gearboxes
  • Other machine tools

R/C Car flywheel selection recommendation:

Brushless Motor Turns Flywheel Voltage / Current Sensor
2.5T - 6.5T 90D-3t Aluminum flywheel 50V / 180A
6.5T - 13.5T 90D-11t Aluminum flywheel 50V / 180A
13.5T - 17.5T 124D-11t Aluminum flywheel 50V / 180A
17.5T - 21.5T 100D-11t Steel flywheel 50V / 180A
21.5T - Up 124D-11t Steel flywheel 50V / 180A

More from this collection

payment option
delivery of goods
satisfaction guarantee
secure transaction
Scroll To Top