MKS HBL990 Brushless Titanium Gear High Speed High Voltage Digital Tail Servo
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The MKS HBL990 is a brushless chrome-titanium gear high-speed high-voltage digital tail servo designed for RC helicopter tail rotor applications. Running on 3.5–8.4V (2S LiPo unregulated) at 760μs/560Hz, it delivers 87.4 oz/in (6.3 kg/cm) at 8.2V with a blistering 0.030 sec/60° transit speed — providing the ultra-fast response required for precise tail authority in high-performance helicopter flight.
A 4-pole brushless motor delivers instant response and long service life. Chrome-titanium alloy gears provide precision and durability under the sustained high-frequency inputs of tail rotor operation. Dual ball bearings ensure smooth, consistent output shaft operation run after run.
Compatible Gyros
- Spartan DS760, Quark
- Futaba GY611, GY601, GY520
- ALIGN GP700, GP750
- Mikado V-Bar Tail, CSM SL720
- Curtis Youngblood Mini-G, Solid G
- Thunder Tiger TG-7000
- BeastX Microbeast
Key Features
- 4-pole brushless motor for ultra-fast response and long service life
- Chrome-titanium alloy gears for precision and durability
- 87.4 oz/in (6.3 kg/cm) stall torque at 8.2V
- 0.030 sec/60° transit speed at 8.2V — ultra-fast tail servo
- 3.5–8.4V operating range (2S LiPo unregulated compatible)
- 760μs / 560Hz working frequency for gyro compatibility
- Dual ball bearings (2BB)
- 40 x 20 x 40mm, 70.55g
Specifications
| Part Number | HBL990 | |
| Operating Voltage | 3.5 – 8.4V DC (2S LiPo unregulated) | |
| Stall Torque (6.0V) | 4.7 kg/cm — 65.2 oz/in | |
| Stall Torque (7.4V) | 5.8 kg/cm — 80.5 oz/in | |
| Stall Torque (8.2V) | 6.3 kg/cm — 87.4 oz/in | |
| Speed (6.0V) | 0.040 sec/60° | |
| Speed (7.4V) | 0.036 sec/60° | |
| Speed (8.2V) | 0.030 sec/60° | |
| Motor Type | 4-Pole Brushless Motor | |
| Gear Type | Chrome-Titanium Alloy | |
| Bearing Type | Dual Ball Bearings (2BB) | |
| Working Frequency | 760μs / 560Hz | |
| Dead Band | 0.0008ms (default) | |
| Dimensions | 40 x 20 x 40mm | |
| Weight | 70.55g | |
Compatibility
Designed for RC helicopter tail rotor applications requiring an ultra-fast, high-voltage brushless tail servo. Compatible with the gyros listed above. Verify gyro compatibility and receiver/ESC BEC voltage output before purchasing.