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Technical Specifications
Last Updated: 2026-10-08| Identity | |
| Brand |  |
| Product Number | BMS-385DMAX |
| Category | Hobby |
| Discontinued | Yes |
| Performance | |
| Torque |
6.0V
66.55 oz-in
4.79 kg-cm
0.5 N-m
4.8V
59.47 oz-in
4.28 kg-cm
0.4 N-m
|
| Speed |
6.0V
0.13 sec/60°
461.5 deg/s
76.9 RPM
4.8V
0.15 sec/60°
400.0 deg/s
66.7 RPM
|
| Physical | |
| Weight | 0.59 oz16.7 gAbove Average |
| Dimensions |
L 1.02 in W 0.50 in H 1.42 in L 25.9 mm W 12.7 mm H 36.1 mm |
| Drivetrain | |
| Gears | Metal |
| Gear Spline/Teeth | 25 T estimate |
| Rotation/Support | Single Bearing |
| Control & Signal | |
| Modulation | Digital |
| Pulse Cycle | 4 ms |
| Neutral Position | 1520 µs |
| Refresh Rate | 250 Hz |
| Electrical & Environment | |
| Operating Voltage | 4.5–6.5 V |
| Power Source | Ni-MH / Ni-CD |
| Connectivity | |
| Connector | JR (Universal) estimate |
Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.
Class Comparison
| Weight | Above Average Lighter than 89% of 466 Digital Mini servos |
Performance Analysis
| Shaft Power | 0.73–0.95 W |
| Power Density | 1.307 W/in³ More power-dense than 35% of 440 Digital Mini servos |
| Torque Density | 3.5611 oz-in/g |
| Torque-to-Volume Ratio | 82.12 oz-in/in³ |
| Speed-to-Weight | 0.39920 (1/sec·g) |
| Speed-Torque Trade-off | 8.92 |
| Voltage Range Width | 2.0 V Wider voltage range than 50% of 351 Digital Mini servos |
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Reviews (4)
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Resin_Smoker
April 20, 2018Application(s): Tricopter-Baby (RCexplorer)
Comments: Added a feedback wire to the potentiometer and connected it to the RSSI input of the Flight Controller. It's speed and torque is very good but unfortunately it flutters badly no matter the tune or additional hardware used. Should be fine for larger copters but another under 200 mm motor to motor spacing should look elsewhere.
bear_sloper
September 20, 2012Application(s): 48" 3D, 60" sloper
Comments: These are excellent servos. I've had a pair on a NCFM M60 slope flyer which I've had in the air for 62 hours now. I spite of rough conditions (sand, rain, hard landings) these servos function flawlessly.
e-Bob
November 16, 2010Application(s): Rudder, ailerons & elevator for a RC airplane
Comments: These servos were found to flutter wildly about center when used with a Spektrum transmitter (DX7) and Spektrum receivers (AR6110e park flyer and AR500 full range). Power supplies were DC battery, Phoenix 35 ESC, and Turnigy 60 ESC. No combination of the above had any effect on moderating this behaviour. Release of a fully deflected elevator caused fluttering of not only the elevator but the rudder, as well. This model had never been flown. The motor was not running in these test. Replacement of these BMS-385DMAX servos by HiTec & Hobbico digital servos eliminated the problem. Neither Blue Bird models nor BPHobbies would respond to my complaints.
Parkflyer
February 13, 2010Application(s): Installed 4 into a PA Extra MX, one on each control surface.
Comments: The servos are excellent. Very strong, very fast and perfect centering! The digital "whine" may be a little loud, but the performance more than makes up for it. I have flown with them for a few months with no problems at all. Recommended!