Blue Bird BMS-127WV+ Servo - 5.3Kg.cm 0.05s 11.3g 10mm

Product Code: BMS-127WV

(12 reviews)

Price: $22.37

Description

The Blue Bird BMS-127WV+ is the highest speed servo in the new Blue Bird BMS-125WV+/126WV+/127WV+ range of 11g servos. At 8.4V the speed of the BMS-127WV+ is an amazing 0.05 seconds per 60° of movement. The torque is slightly lower than the other servos in the series but is still very good at 5.3 Kg.cm. It is suitable for all ailerons and elevators on lighter F5J models, most gliders up to 3 m wingspan and many RC sports models and helicopters. It is especially good for heli tail rotors. 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 + plus moniker on these servos is to indicate this version is an upgrade on the BMS-125WV we previously sold. Some of the photos still show the BMS-127WV as apart from the label the new servo looks identical.

The Blue Bird BMS-127HV+ is a great servo built to the same space saving form factor as the MKS DS6100 and HV6100. It is similarly precise, with no free play in the geartrain, and is much 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 looking like the BMS-105HV, the BMS-127 WV+ uses new components, better bearings and an improved internal design and does not suffer the longevity problems that affected some high hours BMS-105 installations. The BMS-107HV was not affected by the problem anyway.

Blue Bird BMS-127WV+ Servo 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)	2.5 Kg.cm	35 oz.in
Stall torque (6V)	4 Kg.cm	56 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)	0.11 sec/60°
Operating speed (6V)	0.07 sec/60°
Operating speed (8.4V)	0.05 sec/60°
Operating voltage	3.5V to 8.4V
Operating temperature	0 to 40 °C
Bearings	2 ball bearings
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-125, Integrated Drive System/Mono for the Blue Bird BMS-125WV, Frame with bearing for the Blue Bird BMS-125WV

Reviews 12

01/06/2024 16:10

Review by: Anonymous

Very fast, high quality, MG, BB small servo

I've bought and used 3 different models of BBird servos. I've liked them all. This plastic case servo is fast, all MG, BB. No jitter. Under $25. The performance is comparable to KST at a lower price point. All BBird servos have a one year warranty. BBird servos are made in TW, which I think is a step above mainland Chinese quality.

24/04/2024 14:03

Review by: Kjell

Strong, accurate and very fast servo.

24/10/2023 19:44

Review by: Kev

Blue Bird servo

great little servo never have any issues with them
purchased a fair few from Neil over the years
excellent service

03/08/2023 11:59

Review by: Chris Clark

BMS-127WV servo

Great speed and centring. And plenty of power, all in a very lightweight package.

Perfect match for my 1.1m 3D planes.

17/08/2022 18:42

Review by: Lee Waples

Fantastic servo and excellent service as always.
VERY quick delivery and well packed.

27/06/2022 09:05

Review by: Ian W

Blue Bird BMS-127WV servo

I first used these servos in an RCRCM Typhoon a couple of years ago, in which they have performed faultlessly, being both fast, and accurate. I'm now installing them in another slope project, and recommend them, (and Hyperflight's service), highly.

16/08/2021 11:38

Review by: Ross Cooper-Smith

Really nice alternative for both 9g and 14g servos

I've been seeing good reviews online for Blue Bird, and picked up four of these to replace some 14g MG92B servos. Even on 5V they're a fast servo, not too noisy in operation, and they centre and hold very nicely.

And they definitely get bonus points for having the full specs on the box, and a small servo datasheet included showing you the dimensions, max angle throws, and operating pulse range.

21/01/2021 15:02

Review by: Greg McGill (glidermang)

Servo Purchase Order

When local sources for Blue Bird servos dried up, I turned to Hyperflight. As per usual, they responded quickly and efficiently. Even after shipping, their price is competitive. Note: people purchasing from Hyperflight need to realize that shipping worldwide is slow these days, no fault of Hyperflight.

01/08/2020 18:23

Review by: Dick

Replacement for BMS-106HV

Had a Bluebird BMS-106HV fail in my AHI wing so I bought a couple of these as a straight replacement. They fit perfectly.
Ordered at 14:30 hrs and received them first thing the next day. Thanks Neil for your excellent service.

26/06/2020 16:05

Review by: Nuno Duarte

not as aspected.

the servo looks strong as expected but makes continuous noise. even at the neutral point. I hope it lasts long enough

10/11/2019 11:22

Review by: anick

bought for a Snipe RES glider, for the "S", very powerful. probably on 1s will be used.

26/09/2019 19:14

Review by: Anonymous

Good servo for micro helis

Great cyclic servos for micro helis, can also be used on the tail if run on 8v. They will fit an Oxy2 but you need to sand about 0.3mm off the end of the lower mounting tab and make sure it's pushed up against the upper bearing block when installed so the end of the tab won't brush the screws on the maingear assembly. These servos run at 250hz maximum so make sure you change the servo frequency in the FBL controller setup before plugging them in.