Blue Bird BMS-126WV Servo - 5.3Kg.cm 0.07s 11.3g 10mm

The Blue Bird BMS-126WV is optimised or both good speed and good torque, making it the medium option in the new Blue Bird BMS-125WV/126WV/127WV range of 11g servos. At 8.4V the BMS-126WV's torque is still a very impressive 5.3 kg.cm while having an excellent speed of 0.07 seconds per 60° of movement. These are still very impressive speed and torque figures, making it good for most applications. It is suitable for all control surfaces except flaps on F5J models, most gliders up to 3.5 m wingspan and many RC sports models and helicopters. At 10 mm thick it is suitable for mounting in small fuselages and thin wings and tails.

The WV in the name stands for Wide Voltage, indicating that this servo has wide range of acceptable supply voltages and is suitable for 1S LiPo, 4 or 5 cell NiMH and 2S LiPo operation.

The Blue Bird BMS-126HV is a great servo built to the same space saving form factor as the MKS HV6100/DS6100. It is similarly precise, with no free play in the geartrain, and it is even more powerful and faster than the competing product. The large output spline is identical to Futaba 25 tooth splines, so replacement output arms are readily available. Note the output spline is not the same as MKS so the servo cannot be used with most MKS accessories.

Although it looks like the BMS-105HV the new BMS-126 WV uses better components and an improved internal design and does not suffer the longevity problems that affected some high hours BMS-105 installations. The BMS-106HV was not affected by the problem anyway.

Blue Bird BMS-126WV Specifications
Body dimensions	23.2 mm wide x 10.0 mm thick x 23.0 mm high	0.91" wide x 0.39" thick x 0.91" high
Max dimensions	32.0 mm wide x 10.0 mm thick x 25.0 mm high	1.26" wide x 0.39" thick x 0.98" high
Stall torque (3.7V)	2.2 Kg.cm	31 oz.in
Stall torque (6V)	4.1 Kg.cm	57 oz.in
Stall torque (8.4V)	5.3 Kg.cm	74 oz.in
Weight	11.3 g	0.40 oz
Lead length	16 cm	6.3 in
Operating speed (3.7V)	0.16 sec/60°
Operating speed (6V)	0.1 sec/60°
Operating speed (8.4V)	0.07 sec/60°
Operating voltage	3.5V to 8.4V
Operating temperature	0 to 40 °C
Bearings	Plain
Gear material	Metal alloy
Case material	Nylon
Motor type	Coreless DC motor
Working frequency	250 Hz
Dead band/resolution	2 µs
Pulse width for ± 60º	(L) 900 µs - (0°) 1520 µs- (R) 2100 µs
Digital	Yes
Programmable	No
Position feedback	Potentiometer
Supplied accessories	2 plastic output arms, 1 arm retaining screw, 4 mounting screws, Blue Bird sticker
Optional accessories	Ply Frame for Blue Bird BMS-125WV