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Blue Bird BMS-125WV Servo - 0.09s 11.3g 10mm

Product Code: BMS-125WV
 (21 reviews)

Price: $21.11

More than 30 in stock
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The Blue Bird BMS-125WV is the highest torque servo in the new Blue Bird BMS-125WV/126WV/127WV range of 11g servos. At 8.4V the BMS-125WV's torque is a massive 6.2 The speed is slightly compromised but is still 0.09 seconds per 60° of movement. It is suitable for all control surfaces on ligher F5J models and most gliders up to 4 m wingspan. 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-125HV is a great servo built to the same space saving form factor as the MKS DS6100 and MKS HV6100. It is similarly precise, with no free play in the geartrain, and it is much more powerful and faster than the competing products. 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 accesories.

Although it looks like the BMS-105HV the BMS-125 WV uses new components and an improved internal design and does not suffer the longevity problems that affected some high hours BMS-105 installations.

Blue Bird BMS-125WV 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) 2.7 37
Stall torque (6V) 4.3 60
Stall torque (8.4V) 6.2 86
Weight 11.3 g 0.40 oz
Lead length 16 cm 6.3 in
Operating speed (3.7V) 0.2 sec/60°
Operating speed (6V) 0.13 sec/60°
Operating speed (8.4V) 0.09 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 BMS-125WV, Integrated Drive System/Mono for the Blue Bird BMS-125WV, Frame with bearing for the Blue Bird BMS-125WV

Reviews 21  

 Review by:

Decent servos, fast and precise

Used these on my bicopter build. They were fast and accurate and did a great job until I had a bit of a crash. Both now have damaged gearboxes unfortunately. I'm hoping there's a service kit!

 Review by:

Great servos

Used these servos in a number of installations. Great value and a reliable performer

 Review by:

Great Servos, great aervice

Used Hyperflight a few times and they are now my go to store for good value, great spec equipment. Nothing is too much trouble for these guys. Highly recommended.

 Review by:

Blue Bird BMS-125WV Servo

I had two '105' old versions fail when overstressed trying to open jammed undercarriage doors on my SHK. My carelessness. Nevertheless the new ones work fine and appear better overall.

 Review by:


Got them in my F5J plane (Crozilla) and works perfect now after 25 hours of flight.

 Review by:

Great servo but watch out

If you invert your power source you'll not just damage these you will fry them as they have no protection. I just lost 2... ;-( Own fault I know.

 Review by:

blue bird bms 125 wv

update on previous review fitted in flaps no response after landing smoke coming from servo and fitted new servos and worked great servo problem i think or just unlucky

 Review by:

The servo is nice but has some play, the mks DS6100 does not have that so I go for the mks.

 Review by:

I haven't got to use these servos yet. I bought 2 of then and one died after 6 cycles on the tester didn't get anyway near the plane.
Waiting for a replacement to arrive.
They look very good, at least it had the decentness to die on the table.
Buying from the opposite side of the planet is a bummer when things don't go to plan.

Comment by:

Usual good advice and prompt delivery

 Review by:

Excellent service and communication - 10 days order-to-door from UK to Australia. Have only tested one so far, but looks the goods and the price is right. Thank you!

Comment by:


As usual good service

 Review by:

blue bird bms 125 and 126

bought several of these not fitted but appear reasonable quality Service as usual perfeect

 Review by:

Early days yet, thanks to the plague, but the performance so far is excellent for such a compact, moderately priced servo. The service from Hyperflight excellent as ever.

 Review by:

Four servos delivered, without fuss, on time and whilst not yet fitted in to model I am very pleased with them. Packaging exceptional! I have no reason to believe the servos will perform to the same standard.

Comment by:

Work very good and exact.

 Review by:

Great little servo I have installed in model but not flown yet good price

 Review by:

Great looking servo, excellent value and service from Hyperflight

 Review by:

Blue Bird BMS-125WV Servos

These servos are accurate and good value for money.

 Review by:

Used Blue Bird servos in my F3K and have been more than happy with them so decided to use these in my newly purchased Osprey F5J. They behave implacably.

 Review by:

good and fast servos! very fast shipping I will keep buying from Hyperflight. Thumps up

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