Element by Castle

3900kV Brushless System

3900kV Brushless System

An easy, affordable upgrade from brushed or stock brushless systems!

The Element 3900kV Brushless System is designed specifically for use with lightweight 1/10 scale 2WD off-road vehicles, including buggies, trucks and short course trucks. The programmable ESC and powerful 4-pole motor mount easily; after installation a simple throttle setup is all you need to get going!

3900kV brushless motor

The 4-pole, 3900kV sensorless brushless motor delivers more torque with greater efficiency, to meet the demands of today's off-road vehicles.

Motor Specifications:
Dimensions: 1.42 x 1.85 in (36 mm x 47 mm)
Weight (w/wires): 6.54 oz (185.4 g)
kV (RPM/V): 3900kV
Voltage Input: 2S MAX
Shaft Diameter: 0.125 in (3.175 mm)
Poles: 4
Wires: 13AWG Silicone, 6.89 in (175 mm)
Connectors: 4 mm Male bullet connectors


ESC Specifications:
Voltage Input: 2S-3S LiPo (7.4V-11.1V); 6-10 NiCd/NiMH (7.2V-12V)
BEC: 3A @ 2S input
Current Rating: up to 100A
Dimensions: 1.81 x 1.38 x 0.79 in (46 mm x 35 mm x 20 mm)
Weight: 2 oz (56.5 g)
Motor Wires: 13AWG 5.3 in (135 mm), including female bullet connectors
Battery Wires: 13AWG 4.72 in (120 mm), with Deans® Ultra Plug®
Receiver Wire: 11.0 in (280 mm), with Universal radio connector
Motor Limit: on 2S/4200kV Max; on 3S/2800kV Max
Protections: low voltage cutoff, thermal protection

The heat sink's cross-ventilation offers better cooling for more efficient operation.
ESC Programmable Features*:

Brake/Reverse Type – sets whether reverse is enabled or not, and how it is accessed.

Brake Amount – sets what percentage of available braking power is applied with full brake.

Reverse Amount – sets how much power will be applied in reverse, if reverse is enabled.

Punch/Traction Control – designed to smooth high power starts and limit punch when you don't want 100% battery power in every situation. The lower the setting the less throttle change limiting there is; for softer acceleration or for running on low-grip surfaces, raise it to a higher setting.

Drag Brake – sets the amount of brake applied automatically at neutral throttle to simulate the slight braking effect of a neutral brushed motor while coasting.

Dead Band – lets you adjust the throttle sensitivity width at neutral. Smaller values make the controller enter forward or brake/reverse with a smaller movement of the throttle trigger for finer control.

Cut-Off Voltage – sets the voltage at which the ESC removes power from the motor in order to maintain the battery at a safe minimum voltage (LiPo), or to keep the radio system working reliably (NiCd/NiMH).

Motor Timing – allows for lowering or raising the timing advance to the motor to reduce or increase amp draw, run time, motor/battery temperature and top speed and punch.

*ESC can be programmed manually, with the Castle Field Programming Card or through the Castle Link software interface.

120 Day Warranty

Fact Sheet