Servo Specs, Reviews, & Comparison Tool
Blue Bird BMS-705 - Hi Torque Low Profile Servo
Specifications
| Last Updated: | 2025-08-04 |
| Modulation: | Analog |
| Torque: |
4.8V: 83.00 oz-in (5.98 kg-cm) 6.0V: 112.00 oz-in (8.06 kg-cm) |
| Speed: |
4.8V: 0.18 sec/60° 6.0V: 0.16 sec/60° |
| Weight: | 0.99 oz (28.1 g) |
| Dimensions: |
Length:1.65 in (41.9 mm) Width:0.85 in (21.6 mm) Height:0.87 in (22.1 mm) |
| Motor Type: | (add) |
| Gear Type: | (add) |
| Rotation/Support: | Dual Bearings |
| Rotational Range: | (add) |
| Pulse Cycle: | (add) |
| Pulse Width: | (add) |
| Connector Type: | (add) |
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Notes
- The Blue Bird BMS-705 is a specialized sub-micro servo, specifically designed as a high-performance analog tail rotor servo for 450-class helicopters. Its design is singularly focused on delivering the very high speed required for this demanding application. In a helicopter, the tail servo must constantly make tiny, ultra-fast adjustments to counteract the main rotor's torque. The BMS-705 uses a powerful motor and an optimized gear ratio to achieve a blistering transit time, allowing it to keep up with the rapid-fire commands from a modern heading-hold gyro. This results in a stable, predictable, and high-performance tail that resists "wagging" and holds firm during aggressive maneuvers.
- The core identity of the BMS-705 is speed. While it may not have the highest torque rating or the most advanced digital features, its velocity is its greatest asset. Helicopter pilots have long praised the BMS-705 for its ability to deliver a locked-in tail feel, which is one of the most critical aspects of helicopter performance. A solid tail inspires confidence and allows the pilot to focus on their maneuvers, from simple hovering to complex 3D aerobatics. The servo's lightweight construction and specialized gear train are all in service of this one goal: to be as fast as possible.
- While highly specialized for helicopter tails, this servo's speed can be utilized by roboticists for specific niche applications. Any project that requires a very fast, lightweight actuator could benefit from the BMS-705. For example, it could be used to create a high-frequency vibrating mechanism for a component feeder, or as the actuator for a very high-speed optical shutter or filter wheel. It is a specialized tool for when a project's needs can be boiled down to one word: speed.
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