Brushless Series [SR/SXR Edition]

BLS-M45B [SR/SXR Edition]

8.4V@53.4kg / 741.7oz
※ Begin from September 2021, the performance has been upgraded and SR/SXR Dual-Mode functions have been added.
( Including Aluminum Arm * 1 piece, 2 choose 1. )
Application / Suitable
Awesome for 1/6 & 1/8th Buggy / Monster / Crawler / On-Road Car & 3D Airplane, Jet & Helicopter Cyclic.
Electrical Specification (Function Of The Performance) 
Torque At 6.0V 38.3 kg-cm / 532.0 oz-in
Torque At 7.4V 47.9 kg-cm / 665.3 oz-in
Torque At 8.4V 53.4 kg-cm / 741.7 oz-in
Speed At 6.0V 0.09 sec / 60°
Speed At 7.4V 0.07 sec / 60°
Speed At 8.4V 0.06 sec / 60°
Protection Mechanism
Soft Start Protection Soft start to a neutral position.
Over Voltage Protection Over 9.0V drive the protection mode and 8.4V return to normal mode.
Low Voltage Protection Lower than 4.0V, drive the protection mode and 4.5V return to normal mode.
Locked Rotor Protection Stall in 5 sec, output torque goes down.
Temperature Protection Overheat 85 degrees C (185 degrees F), drive the protection mode and down 75 degrees C (167 degrees F) return to normal mode.
Lose Control Protection When losing the transmitter signal, that servo will be back to the neutral position immediately and lock.
Power Supply
Operating Voltage Range  4.5V ~ 8.7V DC ( 2S HV Li-Poly / 2S Li-Fe Compatible )
Control Specification 
Control System Higher-order Algorithm 32-bit MCU (Microcontroller Unit)
Frequency:Up to 400Hz & 1500us or 1520us
Frame Rate (Signal repeat rate) Under 1ms【Compatible with SR & SXR Dual-Mode
Dead Bend Width 0.001ms ( Default:1us)
Potentiometer (Variable Resistor) Magnetic Hall-effect Sensor【Non-Contact】instead of traditional VR.
Mechanical Specifications
Ball Bearing Dual ball bearings
Gear Stainless Steel Output gear with All steel gears
Outside Case Full One-Piece Aluminum CNC Casing
Motor Custom High-Efficiency Brushless Motor
Horn / Gear Spline 25 Teeth
Physical Specifications
Dimension (mm) 40.5 x 20 x 39 mm / 1.59 x 0.79 x 1.54 in
Weight (gram) 81.5 ± 1 grams / 2.87 oz
Product Picture / Dimension Sketch