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Blue Bird BMS-21HV Servo - 0.09s 15.2g 12mm

Product Code: BMS-21HV
 (1 review)

Price: $18.73 save 10%

8 in stock
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The Blue Bird BMS-21HV is a very nice mid sized servo for electric planes and gliders and for cyclic on 250 to 450 sized helis. With a torque of 3.2 at 0.09 sec/60° this servo is powerful and fast, considering its small size and 15 g weight. With a very narrow 2 µs dead band/resolution and a tight geartrain without free play this servo will give excellent control of the model.

This is a mid to high voltage servo, meaning it will work fine on a 4 cell NiMH battery, a 5V BEC output, or a 2S LiPo receiver battery.

Blue Bird BMS-21HV Specifications
Body dimensions 23.0 mm wide x 12.0 mm thick x 25.0 mm high 0.91" wide x 0.47" thick x 0.98" high
Max dimensions 32.5 mm wide x 12.0 mm thick x 31.0 mm high 1.28" wide x 0.47" thick x 1.22" high
Stall torque (5.5V) 2.4 33
Stall torque (6V) 2.6 36
Stall torque (7.4V) 3.2 44
Weight 15.2 g 0.54 oz
Lead length 16 cm 6.3 in
Operating speed (5.5V) 0.12 sec/60°
Operating speed (6V) 0.11 sec/60°
Operating speed (7.4V) 0.09 sec/60°
Operating voltage 5.5V to 8.5V
Operating temperature 0 to 40 °C
Bearings 2 ball bearings
Gear material Metal alloy
Case material Nylon and anodised aluminium
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

Reviews 1  

 Review by:

Blue Bird BMS-21HV Servo - 0.09s 15.2g 1

The servos are well made and very smooth and quiet in operation very quick and the initial tests show the centering is good its nice to find a decent HV micro servo of quality at a reasonable price

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