Blue Bird BMS-M57V Servo - 10.6Kg.cm 0.09s 22.5g 10mm

The Blue Bird BMS-M57V servo is a ground-breaking new servo from Bluebird. It uses a magnetic contactless position sensor which will never wear out and thus removes the major failure mode of my most RC servos.

Despite being only 10 mm thick the M57V’s torque and speed are both very high making it suitable for all control surfaces on fast gliders and jets. The voltage range goes from 4.5V up to 8.5V, making it perfect for use from electronic speed controls (ESC), 4.8V NiMH or 2S Lipo batteries. The high-quality metal gears are supported on three ball bearings and the servo is driven by a high-quality coreless DC motor. The black case is anodised aircraft grade aluminium alloy, not plastic, and the case incorporates four horizontal mounting lugs for secure mounting in wings and tail services.

The large output spline is identical to Futaba 25 tooth splines, so replacement output arms are readily available.

Blue Bird BMS-M57V Specifications
Body dimensions	29.0 mm wide x 10.0 mm thick x 30.0 mm high	1.14" wide x 0.39" thick x 1.18" high
Max dimensions	38.0 mm wide x 10.0 mm thick x 32.0 mm high	1.50" wide x 0.39" thick x 1.26" high
Stall torque (5V)	6.75 Kg.cm	94 oz.in
Stall torque (7.4V)	9.3 Kg.cm	129 oz.in
Stall torque (8.4V)	10.6 Kg.cm	147 oz.in
Weight	22.5 g	0.79 oz
Lead length	15 cm	5.9 in
Operating speed (5V)	0.16 sec/60°
Operating speed (7.4V)	0.1 sec/60°
Operating speed (8.4V)	0.09 sec/60°
Operating voltage	4.5V to 8.5V
Operating temperature	-20 to +60 °C
Bearings	3 ball bearings
Gear material	Metal alloy
Case material	Black anodised aluminium alloy
Motor type	Coreless DC motor
Working frequency	333 Hz
Dead band/resolution	1 µs
Pulse width for ± 60º	(L) 900 µs - (0°) 1520 µs- (R) 2100 µs
Digital	Yes
Programmable	No
Position feedback	Magnetic sensor
Supplied accessories	1 plastic output arms, 1 arm retaining screw, 4 mounting screws, Blue Bird sticker
Optional accessories