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Theta THM988 & THM989 HV Mini Brushless Servos for RC Helicopters
High-performance Theta HV mini brushless servos designed for demanding RC applications. Both the THM988 and THM989 feature excellent centering, metal gears, aluminum cases, and full high-voltage capability (5–8.4V). The main difference is torque — the 989 delivers significantly more power while keeping the same fast speed.
Key Features (Both Models)
- Brushless motor with metal gears
- Aluminum case
- 25T spline (Futaba compatible)
- Magnetic encoder for precise centering
- Operating voltage: 5.0 – 8.4V
- Digital, high refresh rate (up to 400Hz)
- Soft start & excellent holding power
Comparison
| Specification | THM988 | THM989 |
|---|---|---|
| Torque @ 5.0V | 10 kg·cm | 15 kg·cm |
| Torque @ 6.0V | 12 kg·cm | 18 kg·cm |
| Torque @ 7.4V | 14 kg·cm | 21 kg·cm |
| Torque @ 8.4V | 15 kg·cm | 23 kg·cm |
| Speed @ 8.4V | 0.07 sec/60° | 0.07 sec/60° |
| Speed @ 7.4V | 0.08 sec/60° | 0.08 sec/60° |
| Max Current | ≤ 2.3A | ≤ 2.6A |
| Dimensions | 35 × 15 × 31 mm | 35 × 15 × 34 mm |
| Weight | 42–46g | ≈ 54g |
| Best For | 500–600 size heli cyclic, 3D planes, 1/12 cars | 67" aerobatic aircraft, jets, larger 500–600 helis |
This servo delivers excellent centering and reliability Theta is known for. Perfect for pilots who want high performance without moving up to full-size servos.